23-24

Natural Wet Snow Avalanche Triggers Dry Slab Avalanche Woody R.

Woody Ridge
Cooke City
Code
SS-NL-R2-D2-O
Elevation
9500
Aspect
E
Latitude
44.99970
Longitude
-109.91600
Notes

From Obs: “We were skinning in the valley to the East of Woody Ridge near the North end and observed a wet slide occur naturally due to a point release, moving about 500 ft downslope. While that was occurring it remotely triggered a dry slab avalanche approx. 50-100 ft adjacent on the same slope and elevation. The crown appeared to be 3 ft deep, possibly thicker, but we were viewing from afar so hard to tell. 9500 ft elevation, East aspect. 12:02 PM March 17, 2024. Air temp approx. 30F clear skies all day.”

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Avalanche triggered by loose snow avalanche
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Slab
Slab Thickness
36.0 inches
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Wet loose snow avalanche Mt Blackmore

Date
Activity
Skiing

From IG:

Southeast aspect on Mt Blackmore. Unknown time and date. Elevation 9700 to 9800’

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Cooper Daniels

Natural Wet & Dry Avalanche Activity on Woody Ridge

Date
Activity
Skiing

We were skinning in the valley to the East of Woody Ridge near the North end and observed a wet slide occur naturally due to a point release, moving about 500 ft downslope. While that was occurring it remotely triggered a dry slab avalanche approx. 50-100 ft adjacent on the same slope and elevation. The crown appeared to be 3 ft deep, possibly thicker, but we were viewing from afar so hard to tell. 9500 ft elevation, East aspect. 12:02 PM March 17, 2024. Air temp approx. 30F clear skies all day. 

Region
Cooke City
Location (from list)
Woody Ridge
Observer Name
Nathan Iltis

Remote trigger avalanche at Picket Pin

Other place
Out of Advisory Area
Code
HS-AMr-R3-D3-O
Latitude
45.65530
Longitude
-110.55800
Notes

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

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
3
D size
3
Bed Surface
O - Old snow
Slab Thickness
36.0 inches
Vertical Fall
700ft
Slab Width
1000.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Wet snow, dry snow, weak snow

Date
Activity
Skiing

We went on a safari of different snow conditions at Beehive today. We toured up to the prayer flags, looked into the top of Bear Basin on southeast and northeast aspects, and then returned to Beehive through the north edge of Tyler's. We dug a pit in the starting zone of Tyler's and were a bit surprised by an ECTP11 on basal depth hoar. There were percolation columns through the upper half of the snowpack and the lower two thirds of the snowpack were moist. You could make a snowball. The depth hoar remains very weak and F+ hardness. The stout melt freeze crust was 3" thick on the southwest aspect.

Surface snow conditions varied wildly as is often the case in the spring. There was cold powder on the northern half of the compass. The crust had broken down by 11 AM on the southeast aspect and the top 3-5" were wet and rollerballs were easy to push downhill. The southwest aspect was just starting to soften as we left at 1 PM. If we continue to get good overnight freezes, we will only have to worry about wet, loose snow avalanches. Wet slab activity should be limited if there is any. 

Region
Northern Madison
Location (from list)
Beehive Basin
Observer Name
David Zinn