Avalanche Activity

Southern Madison
Bacon Rind
Bacon Rind Skillet Avalanched
Incident details include images
Bacon Rind
R2-D1.5
Elevation: 8,900
Aspect: NE
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

From obs on 2/20: "The skillet slid sometime recently. Based on the snow on top I'm guessing Thursday-Friday last week (Feb 15-16th), but it could have happened up to a week earlier. Broke ~2 ft deep, 150 ft wide, and it was hard to tell how far it ran, but I'm estimating 200 vertical feet."


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Cooke City
Scotch Bonnet
Small Snowmobiler Triggered Avalanche, Cooke City
Incident details include images
Scotch Bonnet
AM
Coordinates: 45.0733, -109.9480
Caught: 0 ; Buried: 0

A rider triggered a small avalanche on a steep rollover. This avalanche was below a much bigger avalanche the was triggered on 02/16/2024. 


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Northern Madison
Buck Ridge
Natural avalanches around Buck Ridge
Incident details include images
Buck Ridge
HS-N-R2-D2-O
Elevation: 9,300
Aspect: NE
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

On 2/18/24 we rode out Buck Ridge to Muddy Creek and towards Cedar Mtn.. In addition to three previously reported avalanches, we saw at least eight recent avalanches that were not previously reported and appeared to have occurred at various times over the last 1-3 days, natural and/or remote triggered by riders. A group in the parking lot mentioned seeing many slides actively happen in this area on Friday 2/16, We saw at least six recent slides in Muddy Creek, two in McAtee Basin, and one in Second Yellow Mule. Most were 2-3' deep hard slabs, ranging from 50'-500' wide.


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Northern Madison
Buck Ridge
Remote triggered slides in Muddy Creek
Incident details include images
Buck Ridge
HS-AMr-R3-D2.5-O
Elevation: 9,300
Aspect: N
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

On 2/18/24 we rode out Buck Ridge to Muddy Creek and towards Cedar Mtn.. In addition to three previously reported avalanches, we saw at least eight recent avalanches that were not previously reported and appeared to have occurred at various times over the last 1-3 days, natural and/or remote triggered by riders. A group in the parking lot mentioned seeing many slides actively happen in this area on Friday 2/16, We saw at least six recent slides in Muddy Creek, two in McAtee Basin, and one in Second Yellow Mule. Most were 2-3' deep hard slabs, ranging from 50'-500' wide.


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Cooke City
COOKE CITY
Natural Avalanche N. of Cooke City
Incident details include images
COOKE CITY
N
Aspect: SW
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

Skiers north of Cooke City saw a recent natural avalanche in steep terrain. 


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Cooke City
Sheep Mountain
Avalanche Sheep Mountain
Sheep Mountain
Coordinates: 45.0722, -109.9280
Caught: 0 ; Buried: 0

From email: "Was in round lake was visiting with a guy in the warm up shack.  He said he caused a decent size avalanche on the sheep mountain side. 

It was roughly 100 feet wide, he was hit by the avalanche but didn’t get buried."


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Northern Gallatin
Portal Creek
4 remote triggered avalanches in Portal Creek
Incident details include images
Portal Creek
SS-AMr
Coordinates: 45.2890, -111.1410
Caught: 0 ; Buried: 0

From facebook on 2/16/24: "Rode up Portal creek today ... We triggered 4 avalanches with the farthest one being 300 yards away. The one in the photo was the scariest one. We were playing below the windy pass hillclimb and the chute next to it let go. We had a sledder almost get caught in it, but thankfully everyone was ok. It's scary out there!"


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Northern Madison
Bear Basin
Natural avalanche in Bear Basin
Incident details include images
Bear Basin
SS-N-R2-D2
Coordinates: 45.3453, -111.3750
Caught: 0 ; Buried: 0

From instagram on 2/16/24: "Just getting to the ridge by prayer flags in Beehive basin. 100 maybe 200 yards wide. Cracked all the way around the corner almost to a couple old tracks. Seemed to be a natural from last night or this morning."


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Lionhead Range
Lionhead Ridge
Remotely triggered avalanche Lionhead
Incident details include images
Lionhead Ridge
HS-AMr-R3-D2-O
Elevation: 8,900
Aspect: N
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

On 2/16/24 we saw a fresh avalanche in Watkins Creek that we think was triggered remotely during the day by a group riding in a flat meadow above, where we saw their tracks at least 150 feet away (photo). This slide was 2-3' deep and 100-150' feet wide, breaking on old sugary snow. HS-R3/4-D2-O. We rode along the flat terrain above the avalanche and could feel our sled tracks punch through the supportable slab into weak snow at the bottom of the snowpack.

We felt a couple collapses while sitting on our sleds, and saw a couple long shooting cracks while riding. We dug a snowpit in Targhee creek on a northwest facing slope at 9,435'. We had an ECTP27 below a 2.5' deep slab, sitting on 1.5' of weak sugary snow.


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Cooke City
Henderson Mountain
Rider Triggered Avalanche Henderson Mountain
Incident details include images
Henderson Mountain
SS-AM-R2-D2-O
Elevation: 10,000
Aspect: E
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

Snowmobilers observed an avalanche on the east side of Henderson Mountain that appeared to be rider triggered. 


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Cooke City
Daisy Pass
Natural Avalanche Chimney Rock, Cooke City
Incident details include images
Daisy Pass
SS-N-R2-D2-O
Elevation: 9,800
Aspect: N
Coordinates: 45.0497, -109.9640
Caught: 0 ; Buried: 0

A natural avalanche happened early in the morning on the north side of Chimney Rock near Daisy Pass. 


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Cooke City
Scotch Bonnet
Large Snowmobiler Triggered Avalanche, Cooke City
Incident details include images
Incident details contain video
Scotch Bonnet
HS-AM-R3-D3-O
Elevation: 10,200
Aspect: N
Coordinates: 45.0735, -109.9450
Caught: 0 ; Buried: 0

A rider on 02/16/2024 triggered a large avalanche on the north side of Scotch Bonnet. Skiers nearby noted that they saw riders on and below the slope but did not see that avalanche happen. 


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Bridger Range
Brackett Creek
Collapsing Bracket Creek
Brackett Creek
Coordinates: 45.8549, -110.9300
Caught: 0 ; Buried: 0

From obs: "Skiing / skinning on north facing areas above the Brackett Creek area with room many to remember big collapses sounding like distant thunder. One was large enough to shake snow off nearby trees. "


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Southern Madison
Bacon Rind
Whumpfing and Cracking, Bacon Rind
Bacon Rind
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

Skiers in Bacon Rind heard a whumpf and saw cracking on the slope below. 


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Southern Madison
Bacon Rind
Natural Avalanche near Bacon Rind
Incident details include images
Bacon Rind
N
Coordinates: 44.9713, -111.0970
Caught: 0 ; Buried: 0

Skiers on 02/22/2024 observed an old avalanche that appeared to of been natural that happened sometime last week near 02/15 -02/16.


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Cooke City
COOKE CITY
Natural Avalanches S. of Cooke City
Incident details include images
COOKE CITY
N
Aspect: E
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

From email: "Noted several 1-2 day old dry loose in steep terrain above the cliffs to the lookers left of Hang Ten. Also A large avalanche. crown propogated through the cliffs and looked to be about 200' wide and 1 1/2-2 ft. deep. Debris was no longer visible so I suspect this ran sometime during or shortly after the storm. (02/15)." 


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Northern Gallatin
Flanders Creek
Natural avalanche south of Flanders
Incident details include images
Flanders Creek
Aspect: NE
Coordinates: 45.4321, -110.9420
Caught: 0 ; Buried: 0

From obs on 02/18/2024: "Toured up to Flanders today. Variable snow but stable conditions on the main route to the SE Bowl. Large natural avalanche on the NE face south of Flanders."


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Cooke City
COOKE CITY
Natural Avalanche near Cooke City
Incident details include images
COOKE CITY
N
Elevation: 9,000
Aspect: NW
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

From email on 02/18/2024: "Photo natural avalanche on a NW aspect at 9000', taken north of Cooke City today. It likely happened right around Feb. 15th.


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Southern Madison
Taylor Fork
Natural Avalanches in Taylor Fork
Incident details include images
Taylor Fork
SS-N-R2-D2-O
Coordinates: 45.0607, -111.2720
Caught: 0 ; Buried: 0

From Obs on 02/17/2024: "We observed large natural avalanches from afar on the west side of Snowslide Mountain, and the east aspect of a peak south of Woodward Mountain. We observed these from a few miles away and were probably several feet deep and a few hundred feet wide." 

 

These avalanches likely happened during or near the end of a large storm that started on 02/14/2024. 


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Lionhead Range
Lionhead Ridge
Natural Avalanches at Lionhead
Lionhead Ridge
N-R2-D2-O
Elevation: 9,000
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

On 2/16/24 GNFAC forecasters rode up Denny Creek below Lionhead Ridge, then around to the north, through Watkins Creek and into the top of Targhee Creek. We saw a lot of old and recent avalanches that happened at various times over the last week, including during an avalanche warning on 2/15, in a wide variety of terrain. On lower elevation, generally non-wind-loaded terrain in the trees we saw at least 4 avalanches that were at least 2' deep and 100' wide. Near ridgelines there were many avalanches, harder slabs, at least 2' deep breaking hundreds of feet wide.


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Cooke City
COOKE CITY
Natural Avalanches in Cooke City
Incident details include images
COOKE CITY
SS-N-R2-D2-O
Elevation: 10,000
Aspect: E
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

Natural avalanches were observed on 02/16/2024 that happened either early in the morning on the 16th or the night before on the 15th.


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Butte Area
Red Mountain
Natural Avalanche, Red Mountain
Incident details include images
Red Mountain
N-R3-D1.5-O
Elevation: 9,600
Aspect: N
Coordinates: 45.7648, -112.4860
Caught: 0 ; Buried: 0

From obs: "North facing, cross loaded, mid-mountain slope on an east to west running rib at around 9,600'.  Typically this zone is scoured by W-SW winds.  Mild to moderate winds and new snow of 10-12" sitting on an exceptionally weak base produced a natural release during the recent storm cycle, possibly early AM 2/15/24. The slide appeared to run full track, 800' +, taking out most of the north facing wall."


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Northern Madison
Buck Ridge
Remotely triggered avalanche on Buck Ridge
Incident details include images
Buck Ridge
AMr-R4-D2-O
Coordinates: 45.1857, -111.4250
Caught: 0 ; Buried: 0

From obs: "Towards the end of the day one of our riders remote triggered a massive avalanche on the North facing slope to the North of Yellow Mule cabin. The 3-4 ft crown propagated around 600 yards wide and slid on near ground facets to the bottom of the slope below depositing a very large debris pile well into the trees."


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Northern Madison
Bear Basin
Small, Natural Avalanche Bear Basin
Incident details include images
Incident details contain video
Bear Basin
L-N-R1-D1
Elevation: 8,500
Aspect: SW
Coordinates: 45.3453, -111.3750
Caught: 0 ; Buried: 0

We noted a small, natural avalanche across the valley in Bear Basin. It appeared to have failed within the storm snow as a loose snow avalanche


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Southern Madison
Taylor Fork
Remotely triggered slide in Sage Basin
Incident details include images
Incident details contain video
Taylor Fork
AMr-R1-D1
Coordinates: 45.0607, -111.2720
Caught: 0 ; Buried: 0

On 2/14/23 we saw a slide in Sage Basin that appears to have been remotely triggered by riders yesterday from ~100 ft away. Couldn't get a great view of it but it appeared to break in two pockets ~50 ft apart, each at least 25 ft wide and running 30 vertical feet. 


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Northern Madison
Buck Ridge
Small Rider Triggered Avalanche Buck Ridge
Incident details include images
Buck Ridge
SS-AM-R2-D1.5-O
Elevation: 9,500
Aspect: NE
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

A small rider triggered avalanche at the top of Third Yellowmule. 

 


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Northern Madison
McAtee Basin
Natural Avalanches McAtee Basin
Incident details include images
McAtee Basin
N
Aspect: W
Coordinates: 45.1771, -111.4350
Caught: 0 ; Buried: 0

Several natural avalanches in McAtee Basin. These avalanches happened early in the morning following a recent storm. 

 


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Northern Madison
Buck Ridge
Remote Triggered Avalanche at Buck Ridge
Incident details include images
Incident details contain video
Buck Ridge
SS-AMr-R2-D2-O
Elevation: 9,400
Aspect: N
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

We rode into Buck Ridge today and in First Yellow Mule, we triggered an avalanche 100' away from a flat meadow below. This avalanche broke several hundred feet wide and 3' deep on weak faceted snow low in the snowpack. This was right next to a slope that we had remotely triggered weeks ago on January 22nd, observation here

 


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Northern Madison
Beehive Basin
Natural Avalanches on Beehive Peak
Incident details include images
Beehive Basin
N
Coordinates: 45.3407, -111.3910
Caught: 0 ; Buried: 0

Skiers noted two natural avalanches on Beehive Peak. 


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Northern Madison
NORTHERN MADISON RANGE
Skier Triggered Avalanche, N. Madison
Incident details include images
NORTHERN MADISON RANGE
SS-AS-R2-D2-O
Coordinates: 45.2952, -111.4100
Caught: 0 ; Buried: 0

Skiers triggered an avalanche at the end of Forest Service Wall outside of Big Sky Resort boundary. 


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Northern Gallatin
Mt Ellis
Whumpfing on Little Ellis
Mt Ellis
Elevation: 7,000
Aspect: NE
Coordinates: 45.6019, -110.9650
Caught: 0 ; Buried: 0

From obs: "Got a whumph descending the ridge from little Ellis on the ENE facing slope just below the ridge around 7000'."


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Bridger Range
The Throne
Collapsing, Cracking and Very Small Sloughs, Bridger
Incident details contain video
The Throne
Coordinates: 45.8822, -110.9520
Caught: 0 ; Buried: 0

On a wind-loaded slope skiers experienced a large collapse and saw shooting cracks above and below them. They also easily triggered small loose snow avalanches in the new snow. 


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Cooke City
Henderson Mountain
Henderson Mountain Avalanche
Incident details include images
Henderson Mountain
SS-N-R2-D2-O
Aspect: E
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

Avalanche on the east side of Henderson Mountain observed on 02/13/2024


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Northern Gallatin
Flanders Creek
Whumpfs and a Natural Avalanche in Flanders
Flanders Creek
N
Aspect: N
Coordinates: 45.4402, -110.9310
Caught: 0 ; Buried: 0

From obs: "Skied the whitebark glade on Flanders and got several whumpfs at the mid and upper elevations. Light overnight and continued wind loading. There was a recent avalanche that appeared to be a wind slab with decent propogation on a north facing rocky slope. Visibility was too poor to get a good look or photo. "


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Southern Madison
Bacon Rind
Continuous Collapsing at Bacon Rind
Bacon Rind
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

From obs: "We got the same feedback that Dave and Doug did on 2/5/24 - collapsing every time we stepped out of the skin track or turned with any force, as well as a few sizable collapses triggered from inside the skin track. Very touchy, skied very well. Stayed well away from avy terrain."


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Cooke City
Mt. Abundance
Multiple avalanches on Mt. Abundance
Incident details include images
Mt. Abundance
SS-ASr-D2-O
Elevation: 9,900
Coordinates: 45.0722, -110.0220
Caught: 0 ; Buried: 0

Three avalanches were triggered 20-50' away from low-angel terrain above by skiers on Mt. Abundance. 

 

From obs: "We observed three similar avalanches on Mt Abundance today (2/11). All were at about 9,900' and on NE-NW aspects. We were able to safely look at the crown of the first one, which was ~150' wide, 55cm deep, and with an HS of 145. It failed on 1-2 cm buried surface hoar. The other avalanches were on shallow unsupported rocky terrain. All were remote triggered from low angle terrain above, 20-50' away. One of the avalanches sympathetically released a gully and ran 800'."


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Northern Madison
Middle Basin
Remotely Triggered Avalanche, Middle Basin
Incident details include images
Middle Basin
SS-ASr-R2-D2-O
Coordinates: 45.3374, -111.3810
Caught: 0 ; Buried: 0

Skiers in Middle Basin remotely triggered two avalanches while crossing below them. One was triggered by the party breaking trail, the second by a 2nd party from the skin track


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Lionhead Range
Hebgen Lake
Large whumps, Hebgen Lake
Incident details include images
Incident details contain video
Hebgen Lake
Elevation: 8,200
Aspect: NE
Coordinates: 44.8381, -111.3430
Caught: 0 ; Buried: 0

 A small whumpf in the skin track was followed by a massive one a few minutes later. I can count on one hand the number of times I got whumpfs in a skin track...rare indeed. The second one was so big it had us both deeply concerned. We peeled off the skin track after deciding to not cross a gully and soon found debris from a sizeable avalanche that released a couple days ago about 500' above us. We dug in the flank and had 100cm of snow, 60 cm new from last week. The snowfall during the Avalanche Warning, doubled the depth and more than doubled the snow water equivalent of the snowpack. It was a large load and avalanches are breaking underneath the new snow.

Karl was using his 100 cm long Norwegian Battle Saw (pic)...a bit overkill.


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Bridger Range
Saddle Peak
Multiple slides overnight on Baldy and Saddle
Incident details include images
Saddle Peak
N-R1-D2
Elevation: 8,600
Aspect: E
Coordinates: 45.7798, -110.9350
Caught: 0 ; Buried: 0

A Bridger Canyon commuter reported 3-4 fresh slides on Baldy and Saddle Peak

From BBSP 2/11/24: "there’s at least 3 slides from over night on the north side of the skyline, 1on the south edge of the football field and one higher on the upper rock band that ran over the cliffs into going home chute".


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Out of Advisory Area
Other place
Remote trigger avalanche at Picket Pin
Incident details include images
Other place
HS-AMr-R3-D3-O
Coordinates: 45.6553, -110.5580
Caught: 0 ; Buried: 0

From FB message 2/11/24: "Picket Pin Mountain yesterday. We triggered it but weren't anywhere near it"


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Lionhead Range
Lionhead Ridge
Many natural avalanches at Lionhead
Incident details include images
Lionhead Ridge
N-R3-D2
Elevation: 9,100
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

On 2/16/24 We rode up Denny Creek below Lionhead Ridge, then around to the north, through Watkins Creek and into the top of Targhee Creek. We saw a lot of old and recent avalanches that happened at various times over the last week, and in a wide variety of terrain. On lower elevation, generally non-wind-loaded terrain in the trees we saw at least 4 avalanches that were at least 2' deep and over 100' wide. Near ridgelines there were many avalanches, harder slabs, 2' deep breaking hundreds of feet wide.


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Southern Madison
Taylor Fork
Natural avalanches in Sage and Sunlight Basins
Incident details include images
Incident details contain video
Taylor Fork
SS-N-R2-D2
Coordinates: 45.0607, -111.2720
Caught: 0 ; Buried: 0

On 2/14/23 we saw two recent natural avalanches along the headwall of Sage Basin and one in Sunlight Basin. Date is estimated based on how much snow is on the debris. All of the slide looked to be 2-3 ft deep, breaking on the early season weak snow at the bottom of the pack. One of the slides in Sage broke ~700 ft wide.


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Northern Madison
Buck Ridge
Shooting Cracks and Instability, Buck Ridge
Buck Ridge
Coordinates: 45.1763, -111.3310
Caught: 0 ; Buried: 0

From obs: "When riding on test slopes with similar conditions we saw shooting cracks all around the sled.  We broke a couple slabs on hills around 25degs right at the crest of the hill but only the crest broke or showed signs of instability."


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Island Park
Centennials - Idaho
Multiple recent avalanche Centennials
Incident details include images
Centennials - Idaho
SS-N-R2-D2-O
Aspect: N
Coordinates: 44.5424, -111.7520
Caught: 0 ; Buried: 0

From obs. 2/11: "No details, came upon them while riding and making observations of the terrain. One was North-Northeast, the other was North-Northwest facing. Across the drainage from each other. Also, notice three other small avalanches on a west facing slope, about two miles east of the first two. All five were on slopes well over 30. In the centennial mountains, close to the continental on the Idaho/Montana border."


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Cooke City
Mt Republic
Natural avalanche on Mt. Republic, Cooke City
Incident details include images
Mt Republic
SS-N-R3-D2
Elevation: 8,900
Aspect: N
Coordinates: 45.0017, -109.9550
Caught: 0 ; Buried: 0

From email: "Natural avalanche from yesterday evening or last night.  

North facing aspect, with an interesting 3 tiered crown beginning around 8900'."


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Out of Advisory Area
Lawn Mower - Town Hill
Natural avalanche on the lawnmower
Incident details include images
Lawn Mower - Town Hill
SS-N-R3-O
Elevation: 8,200
Aspect: NW
Coordinates: 45.5057, -110.4960
Caught: 0 ; Buried: 0

From IG message: “It looks like the lawn mower up north deep creek slide full path. Looking through Bino’s from the valley it looked fairly fresh. Multiple fracture lines up at the starting point. I assume it went naturally”


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Cooke City
Crown Butte
Rider triggered Avalanche Crown Butte
Incident details include images
Crown Butte
SS-AMu-R2-D2-O
Elevation: 9,700
Aspect: N
Coordinates: 45.0525, -109.9620
Caught: 0 ; Buried: 0

A snowmobiler triggered an avalanche as she climbed up the backside of Crown Butte. As she descended the slope the avalanche broke and ran down the slope behind her. Thankfully, no one was caught or injured.


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Island Park
CENTENNIAL RANGE
Recent Naturals in Island Park
Incident details include images
CENTENNIAL RANGE
N-R2-D2
Aspect: E
Coordinates: 44.5278, -111.5680
Caught: 0 ; Buried: 0

From IG 2/10/24: “East aspect, southwest of island park from the blue creek trailhead.”


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Southern Gallatin
Cabin Creek
Shooting Cracks Cabin Creek
Incident details include images
Cabin Creek
Coordinates: 44.8893, -111.2060
Caught: 0 ; Buried: 0

From Obs: "As we were coming out, I spotted this cracking above the creek. A sled has passed nearby on the right side ( you can see the track). The snow cracked and was starting to rub in the left (barely)."

 


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Island Park
Hellroaring Creek
Snowmobiler Triggered Avalanche Centennial Mountains
Incident details contain video
Hellroaring Creek
SS-AMu-R2-D2-O
Elevation: 8,200
Coordinates: 44.5490, -111.4750
Caught: 0 ; Buried: 0

A group of snowmobilers triggered an avalanche on a low-elevation slope in the Centennial Mountains as they rode near the bottom of a steep slope. No one was caught. 


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Lionhead Range
Lionhead Ridge
Remote Triggered Avalanche Lionhead
Incident details include images
Lionhead Ridge
SS-AMr-R3-D2.5-O
Aspect: E
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

A group of riders triggered a large avalanche on Lionhead Ridge as they traveled in nearby terrain that was much less steep.


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Cooke City
Woody Ridge
Natural Avalanche on Woody Ridge, Cooke City
Incident details include images
Woody Ridge
N-R2-D2-O
Elevation: 9,800
Aspect: W
Coordinates: 44.9739, -109.9240
Caught: 0 ; Buried: 0

A natural avalanche on Woody Ridge likely broke sometime between the afternoon 02/09/2024 and 02/10/2024. The reporting party skied in this region on 02/09 and did not see this avalanche. On 02/10 they reported continued collapsing and cracking as well. 


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Northern Madison
Buck Ridge
Remotely Triggered Slide Near First Yellow Mule, Buck Ridge
Incident details include images
Buck Ridge
SS-AMr-D2-O
Elevation: 9,220
Aspect: N
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

From obs: "Member in our group was on the flank of the slope. Crack shot from beneath sled and triggered the slope from ~ 100’ away. Broke about 75 yards wide, ripped to dirt and travelled a short ways to toe of the slope. North facing, 9220’" 


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Lionhead Range
Hebgen Lake
Natural Avalanche Near Hebgen Lake
Incident details include images
Hebgen Lake
SS-N-R2-D2-O
Elevation: 9,000
Aspect: E
Coordinates: 44.8381, -111.3430
Caught: 0 ; Buried: 0

Skiers near Hebgen Lake saw a recent avalanche, within the last 12 hours, while ascending an east-facing slope at 9000'. They noted that the avalanche ran "to the trees, almost full path". 

 

 


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Out of Advisory Area
Remote Trigger in Mill Creek, Absaroka Range
Incident details include images
HS-ASr-R1-D2-O
Elevation: 9,200
Aspect: NE
Coordinates: 45.3215, -110.5750
Caught: 0 ; Buried: 0

Skiers in Mill Creek triggered an avalanche from 20' away from low-angle terrain. 

 

From obs: "We were ascending a low angle shoulder when a NE facing slope around 20ft away went. Crown was around 2ft deep on both sides and around 4ft at the deepest. It broke on the layer of December facts with a pencil hard slab around 1ft-2ft thick. Above the older slab was new snow about 1ft deep in non wind loaded areas, and around 2ft deep in wind loaded areas. It ran about 300ft and was 50ft wide. "


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Bridger Range
Saddle Peak
Avalanche on Saddle Peak
Saddle Peak
L-N-R1-D1-S
Coordinates: 45.7943, -110.9360
Caught: 0 ; Buried: 0

From obs: "Witnessed a natural slide/sluff today day off the top of 1/4 Saddle around 3:30 pm from the Bitterend. Visibility was poor could not see the starting point. The slide produced a large dust cloud running down the right side of the Football field, which would could have taken a person for a ride. The slide ran over the cliffs skiers left of Lundy's Luge. The debris covered all the tracks the from the high traverse across the Cueball. Probably would not have buried a person, but certainly would have rocked your world." 


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Southern Gallatin
Specimen Creek
Whumpfing and Cracking, Specimen Creek
Specimen Creek
Coordinates: 45.0265, -111.0480
Caught: 0 ; Buried: 0

From obs: "Whumphing, collapsing and shooting cracks on all aspects, at all elevations. The longest shooting crack went over 100' long, shot right out in front of me on a 24deg E aspect slope. Propagating collapses out to 40 feet or so, very thin overall snowpack."


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Northern Madison
Beehive Basin
Collapsing and a Very Small Avalanche, Beehive Basin
Beehive Basin
ASr
Coordinates: 45.3512, -111.3990
Caught: 0 ; Buried: 0

Skiers in Beehive Basin noted multiple collapses while touring and remotely triggered a very small avalanche from below. 


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Northern Madison
Buck Ridge
Avalanche of Buck Ridge
Incident details include images
Buck Ridge
SS-N-R2-D2-O
Coordinates: 45.1763, -111.3310
Caught: 0 ; Buried: 0

Riders on 02/10/2024 observed an avalanche that appeared to be natural. This avalanche likely happened a day or two prior to being observed. 


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Cooke City
Miller Ridge
Natural Avalanche on Miller Ridge, Cooke City
Incident details include images
Miller Ridge
SS-N-R2-D2-O
Elevation: 10,000
Aspect: E
Coordinates: 45.0457, -109.9660
Caught: 0 ; Buried: 0

Riders on 02/11/2024 observed two avalanches on the east side of Miller Ridge. These likely happened a few days prior near the end of a recent storm. 

From obs: "Natural avalanches observed on east facing aspect of Miller Ridge on 2/11. Larger avalanche propagated widely on the north end of the ridge around 10,000 ft. Smaller avalanche further south on the ridge as well. "


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Cooke City
Woody Ridge
Thunderous Collapses, Cooke City
Incident details include images
Woody Ridge
Coordinates: 44.9739, -109.9240
Caught: 0 ; Buried: 0

From email on 02/10/2024: "Yesterday, I skied a few Submarine and a few Woody Ridge laps. Collapsing/shooting cracks were widespread and thunderous. Snowfall totals seemed closer to 12” unsettled, with minimal wind. Biggest collapses were near the ridgecrest (1st pic was an impressive shooting crack)."


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Cooke City
Sheep Mountain
Natural Avalanche Sheep Mtn., Cooke City
Incident details include images
Sheep Mountain
N-R2-D2-O
Aspect: N
Coordinates: 45.0809, -109.9320
Caught: 0 ; Buried: 0

Riders on 02/10/2024 observed several natural avalanches on the north side of Sheep Mountain. This avalanche likely happened naturally as there were no tracks on the slope. However, riders noted that it could of been triggered remotely the day before. 

 

 


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Lionhead Range
Hebgen Lake
Two Natural Avalanches near Hebgen Lake
Incident details include images
Hebgen Lake
SS-N-R2-D2-O
Elevation: 9,000
Aspect: E
Coordinates: 44.8381, -111.3430
Caught: 0 ; Buried: 0

Skiers on 02/10/2024 saw two avalanches near Hebgen Lake while ascending an east-facing slope at 9000'. These likely broke 24-48 hour prior to when it was observed. 


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Island Park
CENTENNIAL RANGE
Collapsing in Island Park
CENTENNIAL RANGE
Coordinates: 44.5489, -111.7310
Caught: 0 ; Buried: 0

From obs:  "Felt and heard various collapses of the snow during the day while riding snowmobiles."


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Northern Madison
Buck Ridge
Collapsing at Buck Ridge
Buck Ridge
Coordinates: 45.1721, -111.3910
Caught: 0 ; Buried: 0

Collapsing noted along Buck Ridge.

From obs: "The Bozeman Snow Ranger crew... noticed the snow settling significantly as I rode around on the flats in the Slatt's hill area- the SE facing basin opposite 2nd Yellowmule."


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Lionhead Range
Lionhead Ridge
Natural and remotely triggered avalanches at Lionhead
Lionhead Ridge
AMr
Coordinates: 44.7348, -111.3690
Caught: 0 ; Buried: 0

From facebook: "We saw 4 different avalanches today at the west end of lions head. One triggered close to us. We were at the bottom in a safe spot on a high spot. North 44.73482. West 111.36946. 100 feet wide 100 feet vertical. Broke to the ground. Afterwards we watched 4 more go from a 1/4 mile to 1/2 mile away from us as we were in a safe position on a high spot watching them go. I'm sure we triggered the first one from the bottom, but we were 100 feet from the slope toe."


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Southern Madison
Tepee Basin
Remotely Triggered Avalanche, Tepee Basin
Incident details contain video
Tepee Basin
SS-AMr-R2-D2-O
Elevation: 9,200
Aspect: N
Coordinates: 44.9041, -111.1850
Caught: 0 ; Buried: 0

While crossing flat terrain above a steep slope a rider triggered a large avalanche from 30' away. 


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Southern Madison
Ernie Miller Ridge
Natural Avalanche on Ernest Miller
Incident details include images
Ernie Miller Ridge
SS-N-R3-D2-O
Aspect: NE
Coordinates: 44.9560, -111.1320
Caught: 0 ; Buried: 0

From obs: "Noted a large avalanche that broke in the E,NE bowl off Ernest Miller, appeared to be hundreds of feet wide and several feet deep."


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Southern Madison
Bacon Rind
Collapsing at Bacon Rind
Bacon Rind
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

A skier felt numerous "tree shaking" collapses while touring at Bacon Rind. 


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Cooke City
Hayden Creek
Remote Trigger South of Cooke City
Incident details include images
Hayden Creek
ARr-R2-D1.5-O
Elevation: 9,000
Aspect: NW
Coordinates: 44.9900, -109.9020
Caught: 0 ; Buried: 0

From obs: "While splitboarding south of Cooke City today I remote triggered an avalanche. I stopped to transition, stepped into the snow, triggered a massive collapse and a slope about 100ft away slid."


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Island Park
CENTENNIAL RANGE
Small Snowmobiler Avalanche, Island Park
Incident details include images
CENTENNIAL RANGE
SS-AM-R1-D1-O
Aspect: S
Coordinates: 44.5489, -111.7310
Caught: 0 ; Buried: 0

A rider triggered a small avalanche in a steep gully. This avalanche was small in size but above a narrow gully. 


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Northern Madison
Beehive Basin
Shooting Cracks Beehive Basin
Beehive Basin
Coordinates: 45.3204, -111.3870
Caught: 0 ; Buried: 0

Cracking about 20ft long observed during our tour when crossing over a gully/stream at 35 degree slope angle. Crust about 25-30 centimeters below soft snow showed instability along with the faceted base toward the bottom of the snowpack.


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Cooke City
Henderson Mountain
Natural avalanche on East Henderson
Incident details include images
Henderson Mountain
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

Natural avalanche on East Side of Henderson Mtn. seen late on 2/7/24. South of the two that Doug saw last week, along the ridge. Could have happened yesterday or last night. I didn’t see it yesterday when riding up and down Fisher creek, but visibility was mediocre. The debris and bed had at least some new snow on it.

Also had a large rumbling collapse near 10,000’ west facing when following one skiers old skin track. And had a few large collapses on south facing slopes between 8,000-9000’. 


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Southern Madison
Tepee Basin
Large Avalanche Tepee Basin
Incident details include images
Incident details contain video
Tepee Basin
AMr-R4-D3-O
Elevation: 9,500
Aspect: NE
Coordinates: 44.9041, -111.1850
Caught: 0 ; Buried: 0

From FB Messenger and phone conversation: A group (group 1) of sledders in the meadows of Tepee Basin witnessed an avalanche that failed an estimated 4 feet deep and up to one mile wide of the NE-facing wall that makes up the perimeter of Tepee Basin. They described the avalanche as breaking across the entire face, which, measured on Google Earth, is over a mile wide. 

A second group (group 2) was riding higher in the meadow. We suspect that group remotely triggered the avalanche. 

Group 1 confirmed that group 2 was clear and they got out their beacons to confirm no one else was captured. 

From FB Messenger (second group): "The whole skyline ridge went off this afternoon on the Tepee side. We may have triggered it with our tree riding below, but the whole thing let go about a mile wide."

Video overview: O. El-Zaru


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Cooke City
Henderson Mountain
Collapsing Henderson Mt., Cooke City
Henderson Mountain
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

From email: "Breaking trail, we experienced at least 20 collapses, several of which were large enough to knock snow off the trees around us. Above 9200’ where the snowpack started to deepen, we did not get any collapses or cracking. "


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Northern Gallatin
Hyalite - main fork
Shooting Cracks, Hyalite
Hyalite - main fork
Elevation: 9,000
Aspect: NE
Coordinates: 45.4472, -110.9620
Caught: 0 ; Buried: 0

While ski-cutting a slope skiers saw cracking on the slope. This slope did not avalanche. 


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Island Park
CENTENNIAL RANGE
Rider Triggered Avalanche in Island Park
Incident details include images
CENTENNIAL RANGE
HS-AM-R3-D1.5-O
Elevation: 9,100
Aspect: NE
Coordinates: 44.5489, -111.7310
Caught: 0 ; Buried: 0

A rider triggered avalanche was observed on 02/08/2024. 


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Cooke City
Snowmobile triggered avalanche above Highway 212, Cooke City
Incident details include images
SS-AM-R1-D1-O
Elevation: 8,200
Aspect: NE
Coordinates: 45.0086, -109.8670
Caught: 0 ; Buried: 0

Observed an avalanche above Highway 212 ("the plug") just north of the Wyoming/Montana border. that appeared to be triggered by a snowmobile. It looked fresh, likely from the afternoon of 2/6/2024. Northeast facing slope, 8200'. Technically out of the advisory area. 


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Cooke City
Lulu Pass
Loose Snow Avalanches Henderson Mt. Cooke City
Lulu Pass
L-N
Coordinates: 45.0709, -109.9580
Caught: 0 ; Buried: 0

Snowmobilers near Henderson Mt. saw several small loose snow avalanches near the top of the ridge. These avalanches were isolated to the new snow. 


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Cooke City
Republic Creek
Collapse in Cooke
Republic Creek
Coordinates: 44.9855, -109.9410
Caught: 0 ; Buried: 0

We skied south of Cooke City and dug a snowpit at 9,761' on a west facing slope. We had an ECTP21, 40 cm below the surface (16" down). There was 6-8" of new snow from the weekend above 4" of soft old snow, on top of 4" of a pencil- hard slab, then the soft sugary facets to the ground. ECT broke below the hard slab at the top of the facets (photo). I had one collapse, 10-12' wide near treeline where there was little more wind-loading/effect (photo). 

The unstable test score, very poor snowpack structure, and collapse indicate a person could easily trigger a large avalanche on steep slopes.

Snowed lightly on and off all day with a couple cm accumulation. Wind was light-moderate out of the southwest with mostly overcast skies.


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Bridger Range
The Ramp
Skier Triggered Loose Snow, Bridger Range
The Ramp
L-AS
Coordinates: 45.8288, -110.9310
Caught: 0 ; Buried: 0

Skiers near the Ramp noted recent ski-triggered avalanches in steep terrain. These avalanches were isolated to the new snow and small in size. 

 


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Bridger Range
Sacajewea Peak
Natural Avalanches and Collapsing, Bridgers
Sacajewea Peak
N
Coordinates: 45.8958, -110.9680
Caught: 0 ; Buried: 0

Skiers and snowmobilers near Fairly Lake saw several recent natural avalanches on Pomp, Sac, and Naya Nuki, that likely happened in the last two days. 

 


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Southern Madison
Bacon Rind
Widespread Collapsing and Shooting Cracks at Bacon Rind
Incident details include images
Incident details contain video
Bacon Rind
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

The stability at Bacon Rind was very poor, avalanches were likely, and we avoided (and strongly recommend avoiding) avalanche terrain. We triggered booming collapses and watched cracks shoot out across terrain features and snow shake off nearby trees for the entirety of our tour from the meadow near the car to the top of the Skillet. We avoided steeper meadows and gave the "Skillet" (the primary avalanche path where we were) a wide berth because we felt triggering a slide was so likely. 

There was 8" of new snow. The upper half of the snowpack was a slab, and the lower half was airy depth hoar stressed to the point of failure. Snowpit results were ECTP11 and 12 failing 35cm down from the surface. 


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Island Park
Centennials - Idaho
Many collapses in IP
Centennials - Idaho
Coordinates: 44.5168, -111.6300
Caught: 0 ; Buried: 0

From FB:

We were in the centennials on 4FEB24 and felt whumping collapses on flat snow at 7500’ in the upper finger tributaries of Myers creek. 4 of us snowbiking, and some were using Voyager Pros and phone apps carefully watching slope angle and extremely wary of anything that typically we’d ride on in more stable times. I pulled up to wait for the other three in a relatively flat spot, when the next snowbike pulled up next to me I felt a drop of 2-4 inches and could hear it over the other riders engine. After he shut off I let him know. When the next ride pulled up to us it happened again I we all felt it! Th crust layer there was great for traction and seems to be about 6-10” thick over our weak faceted base layer of 2-3’. I haven’t experienced that in the past 9 seasons on the bike.

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Northern Madison
Beehive Basin
Natural Avalanches in Beehive Basin
Beehive Basin
L-N
Coordinates: 45.3343, -111.3860
Caught: 0 ; Buried: 0

Multiple natural avalanches and at least one suspected human triggered dry loose in Beehive Basin. Most naturals appeared to have run either last night or yesterday (2/3/24), with a couple potentially older slides. New snow and rapidly changing cloud cover/depth perception made it a bit hard to be sure. Suspect one skier trigged dry loose in W facing trees. One of the W-facing chutes further up valley was also observed to have a crown line at approximately 9000' (no photo)


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Northern Madison
Beehive Basin
Skier triggered loose snow in Beehive Basin
Incident details include images
Beehive Basin
L-AS-R1-D1
Elevation: 9,400
Aspect: W
Coordinates: 45.3343, -111.3860
Caught: 0 ; Buried: 0

Multiple natural avalanches and at least one suspected human triggered dry loose in Beehive Basin. Most naturals appeared to have run either last night or yesterday (2/3/24), with a couple potentially older slides. New snow and rapidly changing cloud cover/depth perception made it a bit hard to be sure. Suspect one skier trigged dry loose in W facing trees. One of the W-facing chutes further up valley was also observed to have a crown line at approximately 9000' (no photo)


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Island Park
Collapsing, Island Park
Coordinates: 44.4689, -111.1470
Caught: 0 ; Buried: 0

No avalanches observed. A foot of new snow in 24hrs, 3-4 inches throughout the day. Strong wind gusts in the morning into early afternoon, drifting in open areas and higher elevations. Experienced multiple whoomphing in an open flat area.


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Cooke City
Woody Ridge
Avalanche on Woody Ridge, Cooke City
Incident details include images
Incident details contain video
Woody Ridge
HS-N-R2-D2-O
Elevation: 10,150
Aspect: NW
Coordinates: 44.9692, -109.9280
Caught: 0 ; Buried: 0

A recent natural avalanche on seen on the NW aspect of Woody Ridge at 10,000'. Appeared to of happened today, 02/04/2024.

From obs: "Observed a fresh avalanche this afternoon on Woody Ridge, South of the Submarine. Northwest facing slope, Approximately 10,150'."


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Southern Madison
Bacon Rind
Cracking and Collapsing at Bacon Rind
Incident details include images
Bacon Rind
Coordinates: 44.9609, -111.1000
Caught: 0 ; Buried: 0

Skiers heard and felt numerous large collapses as well as saw cracking while traveling uphill at Bacon Rind. 


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Southern Madison
Cabin Creek
Collapses up Cabin Creek
Cabin Creek
Coordinates: 44.8949, -111.2280
Caught: 0 ; Buried: 0

Went snowmobiling/skiing below White Peak. We saw older crowns down low in the meadows. While skinning up a mellow south facing nose off white peak, we dug down and got a ECTP15 2.5 feet below the surface. About 8-10 inches of snow fell throughout the day up high. As we continued to skin up higher, we observed numerous collapses before we decided to call it a day. We observed that aspects without a crust layer from this week were more reactive, although we saw propagation on solar aspects with a defined crust as well. 


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Island Park
Sawtelle Peak
Partial burial in Island Park
Sawtelle Peak
Coordinates: 44.5611, -111.4430
Caught: 0 ; Buried: 0

From email on 2/2/24:  "We received a call of a missing snowmobile in the Keg Springs area of Island Park at 1642.  The missing snowmobiler arrived at 1800 hours at the rental property his party is staying at and said he had self-extricated from an avalanche."

 


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Island Park
CENTENNIAL RANGE
Whumpfing and Recent Avalanches in Island Park
Incident details include images
CENTENNIAL RANGE
N
Coordinates: 44.5489, -111.4870
Caught: 0 ; Buried: 0

Snowmobilers saw multiple avalanches while riding in Island Park. These avalanches happened in the last week, however the exact date is unknown. 

From obs: "Lots of collapsing and whomping in the snow,  3 avalanches seen in hell roaring creek and performed a few snow pit tests with an ECTP21 with 2 failures at 25 cm and 70 cm."


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Southern Madison
Taylor Fork
Wet Loose/Slabs in Beaver Creek, Taylor Fork
Incident details include images
Incident details contain video
Taylor Fork
WS
Coordinates: 45.0607, -111.2720
Caught: 0 ; Buried: 0

At the Taylor Fork wilderness boundary on an east-facing slope, we saw one natural wet slab avalanche and several smaller wet loose avalanches that likely happened yesterday during the warm sunny weather. 

 


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Bridger Range
BRIDGER RANGE
Recent Natural Wet slides in Bridgers
Incident details include images
BRIDGER RANGE
WL-N-R1-D2-O
Elevation: 8,500
Aspect: E
Coordinates: 45.8512, -110.9480
Caught: 0 ; Buried: 0

I drove up Bridger canyon this afternoon and stopped in a few spots to glass the range for recent avalanches. There were many recent wet avalanches, both wet loose that gouged through the snowpack and wet slabs about one foot deep and 50-100' wide. Many size D2, some smaller. Happened sometime between Monday and today (1-3 days old, maybe some this morning). The main spots for recent wet avalanches were on Bridger Peak and south of the Throne. Mainly on sustained steep terrain with rocky outcrops and east-south facing. There was one wet slab on a northeast facing, mid-elevation slope near the Throne. South facing terrain near Fairy Lake had some wet loose activity. I attached a photo of the wet slab activity on Bridger Peak and south of the Throne.


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Cooke City
Sheep Creek
Wet Snow Avalanches in Sheep Creek, Cooke City
Incident details include images
Sheep Creek
WS-N
Aspect: W
Coordinates: 45.0344, -109.9840
Caught: 0 ; Buried: 0

Natural wet slab and wet loose avalanches were seen in Sheep Creek these happened on 01/30/2024. Observed on 01/30/2024


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Northern Madison
Buck Ridge
Wet Slab Avalanches on Cedar Mtn and 3rd Yellowmule
Incident details include images
Buck Ridge
WS-N-R2-D2
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

There were at least five natural wet slab avalanches on Cedar Mtn and one in Third Yellowmule that likely broke 1/30/24. The largest of these slides appears to be at least 3 ft deep, 500 ft wide and to have run 500 vertical feet.


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Cooke City
Daisy Pass
Daisy Pass avalanche, Cooke City
Incident details include images
Daisy Pass
SS-R2-D2-O
Elevation: 10,000
Aspect: SW
Coordinates: 45.0497, -109.9640
Caught: 0 ; Buried: 0

This avalanche occurred between noon and 4pm on Tuesday, 30 January. It was likely snowmobile trifggered. An adjacent path went naturally on Friday, 26 January.


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Cooke City
Scotch Bonnet
Loose Wet Avalanches on Scotch Bonnet, Cooke City
Incident details include images
Scotch Bonnet
WL-R1-D1
Aspect: W
Coordinates: 45.0733, -109.9480
Caught: 0 ; Buried: 0

Good views today of upper elevation alpine terrain north of Cooke City. Snow remained cold on all aspects will late in the day above 9500'. The exception was steep west and south-facing terrain that had many small point releases. These were multiple loose wet avalanches on the west side of Scotch Bonnet, each of the Rasta Chutes had debris in them and looked recent, probably this afternoon. Just north of the Rastas, we saw a crown of an avalanche, whether that was recent or not was difficult to tell. 


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Bridger Range
BRIDGER RANGE
Recent Naturals in N. Bridgers
Incident details include images
BRIDGER RANGE
N-R2-D2-O
Elevation: 9,000
Aspect: E
Coordinates: 45.8512, -110.9480
Caught: 0 ; Buried: 0

On 2/1/24 GNFAC saw a wide crown in Frazier Basin and a similarly wide crown in another bowl to the north (300-400' wide), from the road with binos. Photos attached. not sure if these occurred recently with the above freezing temperatures or if they are older. they do not appear wet like the others, but I could not see the debris and was generally far away. Also they are in higher terrain favored for cooling effects. But, they easily could have occurred over the recent hot days, potentially triggered by cornice fall? Estimate they happened at start of warm up 1/28 or 1/29, possibly triggered from cornice fall. Ian saw the one to the north on 1/30/24 from Fairy lake area.


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Cooke City
Miller Ridge
Natural Avalanche on Miller Ridge
Incident details include images
Miller Ridge
SS-NC-R2-D2-O
Elevation: 10,000
Aspect: E
Coordinates: 45.0423, -109.9650
Caught: 0 ; Buried: 0

This avalanche released naturally on 1/29/2024. It was seen from the Miller Creek road and looks similar to all the other avalanches in the area.


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Bridger Range
Fairy Lake
Wet avalanches across Bridger Range
Incident details include images
Fairy Lake
WL-N-R2-D2
Coordinates: 45.9043, -110.9580
Caught: 0 ; Buried: 0

Driving up Bridger Canyon we saw wet loose avalanche across the whole range that ran yesterday afternoon (1/29). Some of these slides appear to have gouged down to the ground, entraining the whole season's snowpack.

There were numerous wet loose avalanches on the south facing wall of Frazier Basin, many of which appear to have pulled out dry slabs lower in the path as they ran yesterday afternoon. 


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Cooke City
COOKE CITY
Remote Triggered Avalanche below Pilot Peak
Incident details include images
COOKE CITY
SS-AFu-R2-D2-O
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

Information from IG Stories/ Messages: A group hiked into an ice climb below Pilot Peak on the Montana/ Wyoming border and remotely triggered an avalanche that failed 150 yards above them. They were on a lower-angle slope below and no one was caught or carried. 


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Island Park
Centennials - Idaho
Avalanches in Island Park
Incident details include images
Centennials - Idaho
SS-N
Coordinates: 44.5134, -111.7070
Caught: 0 ; Buried: 0

These avalanches were seen on 01/30/2024. They likely happened on the close to 01/29/2024 towards the end of a recent storm.  

From ob on 01/30/2024: "Over 15 slides spotted on our ride today. Both large and small. Mostly south facing slopes with a large one on a north facing slope. Several hills with visible cracking and ready to let loose." 

Update from email on 01/31/2024: "The slides were very fresh i would say happened the day of or day before I saw them. I rode the same area Sunday (no slides noticed but it was raining) as Tuesday (when we noticed an abundance of them)."


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Northern Madison
Cedar Mtn.
Naturals on Cedar Mountain SE bowl.
Incident details include images
Cedar Mtn.
N
Aspect: SE
Coordinates: 45.2268, -111.5120
Caught: 0 ; Buried: 0

From ob on 01/30: "Natural Avalanches on Cedar Mtn. SE bowl. Occurred sometime between the 4pm on 1/28- 9am on 1/29"


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Cooke City
Round Lake
Partially buried, uninjured snowmobiler in Cooke
Incident details include images
Incident details contain video
Round Lake
SS-AMu-R2-D2-O
Elevation: 9,500
Aspect: E
Coordinates: 45.0745, -109.9070
Caught: 1 ; Buried: 1

A rider from MN triggered an avalanche immediately north of Round Lake. He was caught, pulled his airbag and was buried with his head out, under his sled. He attributes this to his airbag. His partners dug him out and he was uninjured.


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Northern Gallatin
Hyalite - main fork
Loose Wet Avalanches in Hyalite
Hyalite - main fork
Coordinates: 45.4472, -110.9620
Caught: 0 ; Buried: 0

From obs: "Not much snow but I thought it may be worth noting that I saw alot of ice shedding off climbs at unnamed wall today and have heard reports of wet slides coming over climbs in the last couple days"


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Cooke City
COOKE CITY
collapses in Cooke
Incident details include images
Incident details contain video
COOKE CITY
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

We got 2 large collapses as we approached the crown of the slide on Wade's world in Fisher Creek, and another an hour later near Henderson Mtn. On Henderson Bench we could see 2 new avalanches that looked fresh, possibly cornice triggered. It was not windy, so windloading was not the trigger. Regardless, it was disconcerting. Across the Fisher Creek valley we could see a slide on the nose of Sheep Mountain on the same slope that killed a snowmobiler in 2015. [Avalanche details in separate record].


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Cooke City
COOKE CITY
Natural avalanches on Henderson Ridge and Sheep Mtn.
Incident details include images
COOKE CITY
HS-N-R2-D2-O
Elevation: 10,000
Aspect: NE
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

On 1/29/24 On Henderson Bench we could see 2 new avalanches that looked fresh, possibly cornice triggered. It was not windy, so windloading was not the trigger. Regardless, it was disconcerting. Across the Fisher Creek valley we could see a slide on the nose of Sheep Mountain on the same slope that killed a snowmobiler in 2015.


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Lionhead Range
LIONHEAD AREA
Small Avalanche on Test Slope at Lionhead
Incident details contain video
LIONHEAD AREA
SS-AFc-R1-D1-O
Coordinates: 44.7292, -111.3230
Caught: 0 ; Buried: 0

A snowmobiler jumped and did a cannonball onto a very small slope, triggering an equally small avalanche. This was a clear sign that larger avalanches are likely on bigger slopes. 


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Bridger Range
Bridger Peak
Avalanche on Bridger Peak
Incident details include images
Incident details contain video
Bridger Peak
SS-ACc-R2-D2-O
Elevation: 8,500
Aspect: E
Coordinates: 45.7701, -110.9400
Caught: 0 ; Buried: 0

Skiers triggered an avalanche on Bridger Peak after knocking a cornice off the ridgeline. 

From obs: "Knocked off microwave-sized cornice while skinning which fell and triggered the slope below.... Slide seemed to start very slowly and then propagated North (to the left in the pictures) before running down the slide path. "


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Southern Madison
Telemark Meadows
Collapsing and Cracking Telemark Meadows
Telemark Meadows
Coordinates: 44.8899, -111.0630
Caught: 0 ; Buried: 0

Multiple parties of skiers on 01/28/2024 observed widespread cracking and collapsing in the Telemark Meadow area. 


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Southern Gallatin
Fawn Pass
Collapsing Fawn Pass
Fawn Pass
Coordinates: 44.9282, -110.9140
Caught: 0 ; Buried: 0

30+ whumps on any slope with wind slab deeper than 5”. 


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Cooke City
Henderson Mountain
Collapsing around Cooke City
Henderson Mountain
Coordinates: 45.0524, -109.9450
Caught: 0 ; Buried: 0

We skied from Henderson Mtn over to Daisy Pass and had numerous large, thunderous whumps, bother there and back.


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Bridger Range
BRIDGER RANGE
Explosive triggered slab on facets, BBSP
BRIDGER RANGE
AEc-R2-D2-O
Elevation: 8,500
Aspect: NE
Coordinates: 45.8512, -110.9480
Caught: 0 ; Buried: 0

From BBSP: "a jug of ANFO released an R2D2 avalanche that was 16" deep and 150ft wide that ran down to near the upper gate traverse level. It broke on the basal crust that had 4mm facets above."


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Cooke City
Daisy Pass
Whumpfing in Cooke City
Daisy Pass
Coordinates: 45.0324, -109.9460
Caught: 0 ; Buried: 0

Whumping on approach when not is snowmobile tracks. Dug a pit on a north east face slope off the Miller creek road approach to daisy pass at ≈ 9000ft . Shallow snow pack 110cm. Ectp 10 60 cm from ground 26 deg slope. Choose to ski low angle south west facing slope with no terrain above. No recent natural slides were observed. 


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Southern Madison
Telemark Meadows
Cracking and Whumpfing in Telemark Meadows
Telemark Meadows
Coordinates: 44.8975, -111.0750
Caught: 0 ; Buried: 0

Started noticing cracking, collapsing, and whumfing around 7800' on east-facing slopes. ECTP 11 on our stability test


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Cooke City
Republic Creek
Natural Avalanches in Republic Creek
Incident details include images
Republic Creek
D2
Coordinates: 44.9855, -109.9410
Caught: 0 ; Buried: 0

From obs on 01/29/2024: "Observed quite a few avalanches at the head of Republic Valley today. D1-D2. Range. Looked to be 2-3 days old on various aspects. primarily North-Northwest facing. Attached a few photos. Did not get a good shot of The headwall off Republic peak but that had also slid"


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Bridger Range
Bridger Bowl
BBSP explosive triggered slides
Bridger Bowl
SS-AEc-R2-D2-O
Elevation: 8,500
Aspect: E
Coordinates: 45.8156, -110.9230
Caught: 0 ; Buried: 0

From email 1/26/24: "7 ANFO jug shots were used in D-Rt and S-1. [Areas not open to public skiing yet this season]

Joel's Belly which broke 12-18" deep 50+' wide on the wind loaded south shoulder above the joel's zip drive - majority of the debris didn't go too far, southside portion rolled off the stubborn angle and down onto the z-fan.

Z-Chute southside above traverse to lost shot bowl removed the seasons snowpack down to the basal crust. 50-100 ft wide, pulling the faceted snow off the steep rocky wall to the south and put a lot of debris on the Z-Fan and ran 100ft below the south bowl traverse.

Middle of Lost Shot bowl released but not very big."

 


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Northern Madison
Lone Mountain
BSSP explosive triggered very large slide on NSS
Lone Mountain
HS-ABc-R4-D3.5-O
Elevation: 11,000
Aspect: N
Coordinates: 45.2777, -111.4510
Caught: 0 ; Buried: 0

From email 1/26/24: "The NSS avalanched R3/4, D3.5 on a 6lb. shot on a stick. There were multiple basal layers involved, including gouging to the ground. Big avalanche and not a surprise. That zone has been filling in, growing in volume, and hardening in the wind.... Unsurprisingly, it did not take much added intensity to make it avalanche."


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Northern Madison
Buck Ridge
Natural slide on North Aspect, Buck
Incident details include images
Buck Ridge
SS-N-R2-D1.5-O
Elevation: 9,000
Aspect: N
Coordinates: 45.1785, -111111000000.0000
Caught: 0 ; Buried: 0

From obs: "Similar to your complete ripout of the slope at the head of first yellow mule, this aspect pulled out naturally likely on the 25th - natural caused. No tracks around."


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Northern Madison
Buck Ridge
all of Muddy Ridge slid, natural and rider tirggered
Incident details include images
Buck Ridge
N-R3-D2-O
Elevation: 9,350
Aspect: N
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

Starting at  45°11'13.26"N /  111°27'36.92"W, the NNE slope slid  (likely rider caused 2 days ago).
The adjacent slopes at  45°11'18.09"N / 111°27'54.78"W further west were slightly newer perhaps the 26th or late on the 25th. Each ripped down to the ground at the crown. Severe instability was present even when cresting over the slope from the entrance through the regular access to cedar - still not broke open.


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Northern Madison
Buck Ridge
Big avalanche in 2nd YellowMule
Incident details include images
Buck Ridge
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

From IG message 1/26/24: "2nd yellowmule. Main north facing ridge. Whole thing ripped out. Appears like yesterday, but unsure. Massive slide."


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Lionhead Range
Lionhead Ridge
Natural and rider triggered slides at Lionhead
Incident details include images
Lionhead Ridge
SS-N-R3-D2
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

On 1/26/24 we observed two avalanches at Lionhead that appeared to have broken in the last 24 hours.

One slide broke below treeline in Denny Creek, around 100 ft wide and ran around 100 vertical feet. Looked to have broke 1-2 ft deep. Recent snowmobile tracks about 50 ft away from the flank make it seem likely it was remotely snowmobile triggered. 

The other slide was larger, it broke around 600 ft wide and ran 500 vertical ft. Didn't get a good look at the crown, but would estimate it broke around 2-3 ft deep. It broke across three gullies that sometime avalanche as separate paths. 


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Cooke City
COOKE CITY
More Avalanche Activity in Cooke City
Incident details include images
COOKE CITY
N-R2-D2-O
Elevation: 10,000
Coordinates: 45.0505, -109.9620
Caught: 0 ; Buried: 0

More avalanches were seen north of Cooke City. These avalanches likely happened on 01/25. 

 


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Southern Madison
Cabin Creek
Cracks and Collapses in Cabin Creek, Tepee Basin, Bridgers, Beehive, Cooke City
Cabin Creek
Coordinates: 44.8949, -111.2280
Caught: 0 ; Buried: 0

Cracking and collapsing reported across the advisory area. Shooting cracks up to 100 ft long. 


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Bridger Range
Saddle Peak
Slide Under Saddle Peak Cliff
Incident details include images
Saddle Peak
R2-D2-O
Aspect: NE
Coordinates: 45.7943, -110.9360
Caught: 0 ; Buried: 0

The trigger of this avalanche is unknown but there are many ski tracks in and out of the path of the avalanche. Another party in the area the day before said this slope had not avalanched. 

 

From obs: "The location is the knoll under the Saddle Peak cliff that can be accessed by traversing through the southern boundary gate from Bridger Bowl. The slide propagated on a NE aspect going into a gully. The crown looked to be 1-2 feet tall with an approximate width of 30 feet. There are numerous tracks that go in and out of the slide path, but could not tell if it was triggered by a skier. A friend who I was with said that the slide had not been there the day before."


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Cooke City
Mt Fox
Mt. Fox Avalanches
Incident details include images
Mt Fox
N-R2-D2-O
Aspect: E
Coordinates: 45.1212, -109.9300
Caught: 0 ; Buried: 0

Skiers on 01/25/2024 observed recent avalanches below Mt. Fox north of Cooke City. 


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Cooke City
Sheep Mountain
Large natural on Sheep Mtn
Sheep Mountain
N
Aspect: NE
Coordinates: 45.0722, -109.9280
Caught: 0 ; Buried: 0

From email: "

 I did not get a good photo but yesterday (01/24) skiing out of the yurt with friends noticed a large natural on the NorthEast facing bowl on Sheep Mountain. Similar size to the Henderson slide if not a little larger. 

~300 ft. crown and ran a similar distance (300-400ft?)"


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Cooke City
Zimmer Creek
Remotely triggered small avalanches in Cooke
Incident details include images
Zimmer Creek
SS-ASr-R1-D1
Coordinates: 45.0999, -109.8840
Caught: 0 ; Buried: 0

Skiers triggered several small avalanches while skiing near the zimmer creek yurt. 

From email: "Also remote triggered a few D1 avalanches over the past 2 days. Continous cracking/collapsing even in a day old skin track. "


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Cooke City
COOKE CITY
Natural Avalanches in Cooke City
Incident details include images
COOKE CITY
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0
Photos from today (1/24/24).  A couple of these slides look to be fresh in the last 48 hrs.

Also that large avalanche observed today on the SE aspect Mt. Henderson was not visible there at 4pm yesterday (1/23)


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Cooke City
Henderson Bench
Avalanche on Henderson Mountain
Incident details include images
Henderson Bench
SS-R3-D2
Aspect: S
Coordinates: 45.0558, -109.9470
Caught: 0 ; Buried: 0

From obs: "Was out today and noticed this large avalanche on the south side of Henderson. Looks like it happened today or yesterday. Possible remote trigger, snowmobilers were riding underneath that zone. The slide looks about 200 feet across and 4 feet deep in the thickest spot. D2. "

 


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Lionhead Range
Lionhead Ridge
Many natural avalanches along Lionhead Ridge
Incident details include images
Incident details contain video
Lionhead Ridge
SS-N-R1-D2
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

Rode along Lionhead Ridge from Denny Creek to Watkins Creek and around into the head of Targhee Creek on 1/26/24. Saw dozens of avalanches that broke within the last week. Most of the slides looked to have broken early this week. 1/23/24 date is approximate. Slides broke on all aspects, both above treeline and well below treeline, and on both wind-loaded and nonwind-loaded slopes. All these slides looked to have broken on one of the December surface hoar layers at the top of the early season facets.

 


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Cooke City
COOKE CITY
Remote Triggered Avalanche Near Woody Creek, Cooke City
Incident details include images
COOKE CITY
SS-ASr-R1-D2
Elevation: 9,400
Coordinates: 44.9963, -109.9020
Caught: 0 ; Buried: 0

While skiing a zone called "ollies woods", a southern aspect that's relatively low angle, we noted widespread loud whumphing of the snowpack in the trees. I Spent some time traversing around the tree'd face on the way down to my group, traveling far right to a sub-ridge where the aspect changed to east, the terrain became more open, and slope angle became steeper. I felt a large whumph, paused, and turned around descending the rest of the southern aspect to the valley bottom.

 

Once back to the valley bottom, I saw a recent avalanche had slid just below where I was standing earlier on the sub-ridge. Looking from a far, the crown looked about 10" - 15" deep, 60'-100' wide, and fractured on a layer of facets. The slope angle was 31 degrees and at 9100ft elevation. See photo, x marks my relative location when I heard the "whumph"

 


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Cooke City
COOKE CITY
Collapsing and Avalanches on Test Slopes, Cooke City
COOKE CITY
Coordinates: 44.9963, -109.9020
Caught: 0 ; Buried: 0

A group in Cooke City observed several signs of instability including widespread collapsing, small avalanches on test slopes, and recent avalanche activity.

 

From obs: "Observed extremely unstable avalanche conditions while ski touring in the Woody Creek Drainage south of Cooke City for the past 4 days. While traveling through the valley floor, I noted whumphing, collapsing, and cracking in the snowpack. I was able to trigger small slides on steeper test slopes just above creek beds from 50-60 feet away. I noted several larger avalanches up high, on all aspects. We played it safe and stuck to skiing and traveling through slopes under 25 degrees and limited our exposure time under large avalanche paths."

 

 


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Northern Madison
Beehive Basin
Test Slope Avalanche, Beehive Basin
Incident details include images
Beehive Basin
SS-ASc-R3-D1.5
Elevation: 8,000
Aspect: W
Coordinates: 45.3407, -111.3910
Caught: 0 ; Buried: 0

From email: "AAI Pro 1 course to Beehive Basin. One of the students stomped on a lower angle slope directly above a large test slope. On the second stomp the slope released. West aspect at about 8000'. SS-ASc-R3-D1.5-O. Some localized cr, co while breaking trail."


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Island Park
Other place
Cracking and Collapsing in Black Canyon, Island Park
Other place
Coordinates: 44.4767, -111139000.0000
Caught: 0 ; Buried: 0

From obs: "Collapsing snow could be felt underneath my sled all day up Black Canyon Loop trail, east of Island Park. There was a moment where shooting cracks spread from my ski tips to about 10 yards away on flat ground. The canyon just north my location was probably steep enough to slide."


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Bridger Range
The Throne
Collapsing, natural avalanche at the Throne
Incident details contain video
The Throne
R1-D1-O
Elevation: 8,000
Aspect: E
Coordinates: 45.8822, -110.9520
Caught: 0 ; Buried: 0

We rode into the Throne in the northern Bridgers. On the east facing hill visible from the sleds, a slab avalanche about 1 foot deep and 100 feet wide was seen. The debris fanned out and did not seem deep enough to bury a person. A roller ball likely triggered it on Sunday (01/21/24) as there were no roller ball tracks on the bed surface, only leading to the crown. It was a bit disheartening to think that a roller ball was enough to trigger a slide.

We skinned to the runout zone of the Throne letting our runout angle approach 23 degrees. We has numerous collapses and we decided to not ascent because there is not a way to stay out of avalanche terrain, plus we were concerned about having a collapse propagate up the hill and avalanche on us.

 


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Bridger Range
Fairy Lake
Collapsing and Shooting Cracks in Bridgers
Incident details include images
Fairy Lake
Coordinates: 45.9043, -110.9580
Caught: 0 ; Buried: 0

Large natural avalanches and significant cornice formation were visible in October Bowl. We noted frequent collapsing and shooting cracks (5-100ft+) on E facing slopes at ~8000ft.

Photo taken 1/30/24


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Cooke City
COOKE CITY
Natural Avalanches in Cooke City
COOKE CITY
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0
Photos from today (1/24/24).  A couple of these slides look to be fresh in the last 48 hrs.

Also that large avalanche observed today on the SE aspect Mt. Henderson was not visible there at 4pm yesterday (1/23)


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Cooke City
COOKE CITY
Alp Rock Natural Avalanche
Incident details include images
COOKE CITY
SS-N-R2-D2-O
Elevation: 9,500
Aspect: E
Coordinates: 45.0202, -109.9380
Caught: 0 ; Buried: 0

The slopes above the last pillow pitch slid naturally. The crown extended from high up on the cliffs to lower down and across, and the cliff face. It ran a few hundred feet (~200) . A few new inches on the skin track (3-4)


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Northern Madison
Buck Ridge
Remote Triggered Avalanche at Buck Ridge
Incident details include images
Incident details contain video
Buck Ridge
AMr-R2-D2-O
Elevation: 9,300
Aspect: N
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

In First Yellowmule, Dave was crossing a low-angle slope and remotely triggered an avalanche in steep terrain from 750' away. This avalanche was 1-2' deep, 250' wide, and ran 200' to the meadow below. The avalanche failed on a layer of buried surface hoar. At the crown, we dug a snowpit and had ECTP10 results on this layer.

Some avalanches we saw/ triggered were on wind-loaded slopes, and others were not. All steep slopes are suspect. 


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Bridger Range
Fairy Lake
Natural Avalanches in Northern Bridgers
Fairy Lake
N
Coordinates: 45.9043, -110.9580
Caught: 0 ; Buried: 0

Large natural avalanches and significant cornice formation were visible in October Bowl. 


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Northern Madison
Buck Ridge
Natural Avalanches at Buck Ridge
Incident details include images
Incident details contain video
Buck Ridge
HS-N-R2-D2
Coordinates: 45.1719, -111.3800
Caught: 0 ; Buried: 0

We rode into Buck Ridge today, 01/22, towards the Bear Creek wilderness boundary. Dangerous avalanche conditions exist. Skiers and riders should give themselves wide safety margins when traveling around avalanche terrain. Cautious route-finding and conservative decision-making are essential. 

We saw multiple natural avalanches in Beaver Creek, First Yellowmule, Second Yellowmule, Third Yellowmule, and McAtee Basin. The recent avalanches were large enough to bury or injure backcountry travelers (D2) and likely happened within the last 24-48 hours.

We stopped at the crown of an avalanche in Beaver Creek and found a stiff, cohesive slab of wind-drifted snow on top of faceted snow below (ECTP 13, HS=188). The avalanche failed on the interface between the wind-loaded snow and fist hard facets below. The avalanche broke 2-3 feet deep, 100 feet wide, and ran 100 vertical feet.

Some avalanches we saw were on wind-loaded slopes, and others were not. All steep slopes are suspect. 


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Bridger Range
Truman Gulch
Natural avalanches in Bostwick and Truman Gulch
Incident details include images
Truman Gulch
SS-N-R2-D2-O
Coordinates: 45.8139, -110.9330
Caught: 0 ; Buried: 0

From BBSP:

They noted 2 or 3 natural slides that occurred last night on the backside of Bridger Bowl in Truman Gulch.


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Bridger Range
Saddle Peak
Skier triggered on Saddle Peak
Incident details include images
Saddle Peak
ASu-R2-D2.5-O
Elevation: 8,800
Aspect: E
Coordinates: 45.7943, -110.9360
Caught: 0 ; Buried: 0

From GCSAR and Bridger Bowl Ski Patrol:

A skier triggered a slide descending the skyline/nose of Saddle Peak. No one was caught. It initially triggered at the first rock band, then pulled out much wider at the second rock band. The skier was on his second lap was the third set of tracks on the peak. All tracks were accounted for and a beacon search of the debris came up empty.

Depth was described as "full depth" (2 feet) and running on the depth hoar.

Crown was 80' wide on the first horizontal band and 250' on the second. The lower crown wrappped around the ridge out of view.


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Northern Madison
Beehive Basin
Cracking in Beehive
Incident details include images
Beehive Basin
Coordinates: 45.3407, -111.3910
Caught: 0 ; Buried: 0

From obs: "As we approached the cornice-triggered slide from yesterday below the prayer flags, we stomped around on a low-angle east-facing test slope just south of the slide to assess the presence and character of the slab. Stomping on the test slope yielded 15' plus shooting cracks from my ski tips and remotely triggered cracks about 30' further down the slope below a rollover. A subsequent test slope north of yesterday's slide produced a whumpf. A significant chunk of that cornice is cracked and ready to collapse. While jumping on the test slope almost 100 feet away from the cornice, a small piece broke off and fell onto the slope below. " 

 


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Northern Gallatin
Hyalite - main fork
Avalanche near Solstice, Hyalite
Incident details include images
Hyalite - main fork
Coordinates: 45.4324, -110.9750
Caught: 0 ; Buried: 0

Climbers in Hyalite saw an avalanche near Solstice that happened on 01/21. This avalanche is 1' deep at the crown and with 18" of facets snow below. 


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Lionhead Range
Lionhead Ridge
Natural Avalanche Lionhead Ridge
Incident details include images
Incident details contain video
Lionhead Ridge
SS-N-R1-D1.5-O
Aspect: E
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

Riders spotted a small natural avalanche on Lionhead Ridge. The slide occurred in the morning of January 21. Unknown dimensions, but weak layers in the area are buried ~18" deep, and the slide appears relatively small. 


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Bridger Range
Texas Meadow
Large collapses in the Bridgers
Texas Meadow
Coordinates: 45.8406, -110.9330
Caught: 0 ; Buried: 0

Skiers north of Bridger Bowl experienced frequent collapsing while walking across flat terrain near Texas Meadows. Many of the collapses were small but others were "large booming collapses"


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Lionhead Range
Ski Hill
Natural Avalanche Ski Hill
Incident details include images
Incident details contain video
Ski Hill
SS-N-R2-D2-O
Elevation: 7,950
Aspect: E
Coordinates: 44.7016, -111.2930
Caught: 0 ; Buried: 0

A natural avalanche broke on January 21 on Brady's Slope on Ski Hill. Walking to look at the avalanche, we triggered a large collapse and shooting cracks. We dug a pit nearby and got very unstable test results (ECTP4) on a layer of 15-20 mm surface hoar buried 18" deep. Avalanche width and vertical fall were estimated based on Google Earth measurements.


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