Above freezing temperatures at higher elevations created wet snow avalanches on slopes facing the sun. Photo: G. Antonioli
Avalanche Details: Wet loose and cornice falls Hyalite
Northern Gallatin, 2019-01-14
18-19
Collapse and recent avalanche at Bacon Rind
Bacon Rind
Southern Madison
Code
SS-N-R2-D1.5-O
Elevation
8750
Aspect
N
Latitude
44.96050
Longitude
-111.11600
Notes
From e-mail "...Surprisingly supportive trailbreaking. Isolated collapsing both low in Bacon Rind creek, and ascending under Ernie Miller. One notable whumph at 9200' near saddle, we could hear sympathetic whumphing into the distance. Triggered from a thin spot near a tree.
Numerous older slides on the lesser angled, SE and SSE asp of Ernie Miller, as well as Northerly asps of White Peak and BTL areas at the head of Bacon Rind creek.
One small slide on a N asp at head of Bacon rind creek, elev 8750, had a crisper look than most of the others observed, suspect more recent. Not a big pocket but indicative of what might still be out there waiting for a trigger, given the fact that we are still observing collapses even this long after significant loading. Photo attached.
...probing at 8300' in a sheltered open low angle meadow, E asp, found a mighty 80cm. Same setup described elsewhere in the area, about 10cm DF which is faceting out, capped by SH 3-5mm, overlying 25cm or so 1F slab, overlying very weak FC."
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
1.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Images
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
"One small slide on a N asp at head of Bacon rind creek, elev 8750, had a crisper look than most of the others observed, suspect more recent." Photo: M. Best
Avalanche Details: Collapse and recent avalanche at Bacon Rind
Forecast link: GNFAC Avalanche Forecast for Mon Jan 14, 2019
Southern Madison, 2019-01-14
Forecast link: GNFAC Avalanche Forecast for Mon Jan 14, 2019
Snowmobiler triggered avalanche in McAtee
McAtee Basin
Northern Madison
Code
HS-AMu-R3-D1.5-O
Elevation
9280
Aspect
SE
Latitude
45.18380
Longitude
-111.44200
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
3
D size
1.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
18.0 inches
Vertical Fall
40ft
Slab Width
40.00ft
Attached Videos
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
A snowmobiler triggered this small avalanche on Friday (1/11) between the 3rd Yellow Mule and McAtee Basin on Buck Ridge. The slope has a terrain trap at the bottom where snow can pile deep and makes small slides more dangerous. The relatively shallow snowpack is weaker and shows that a poor snowpack structure exists on some slopes in the northern mountains of our advisory area, and makes avalanches possible to trigger. Photo: GNFAC
Avalanche Details: Snowmobiler triggered avalanche in McAtee
Forecast link: GNFAC Avalanche Forecast for Mon Jan 14, 2019GNFAC Avalanche Forecast for Wed Jan 16, 2019
Northern Madison, 2019-01-13
Forecast link: GNFAC Avalanche Forecast for Mon Jan 14, 2019GNFAC Avalanche Forecast for Wed Jan 16, 2019
Snowmobile triggered avalanche in Little Belts
Out of Advisory Area
Code
HS-AMu-R3-D2.5-O
Elevation
8000
Aspect
E
Latitude
46.90580
Longitude
-110.58500
Notes
Avalanche triggered by snowmobilers in the Little Belts on Thursday (1/10). This is outside of our advisory area, but shows many of the mountains in Montana have a weak and unstable snowpack. Photo: N. Boyer
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
3
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
48.0 inches
Images
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Avalanche triggered by snowmobilers in the Little Belts on Thursday (1/10). This is outside of our advisory area, but shows many of the mountains in Montana have a weak and unstable snowpack. Photo: N. Boyer
Avalanche Details: Snowmobile triggered avalanche in Little Belts
Out of Advisory Area, 2019-01-13