24-25

Two Rider triggered slides in Gravelly Range

Out of Advisory Area
Code
SS-AM-R2-D2
Latitude
44.85020
Longitude
-111.76700
Notes

From FB message: "Two snowmobiler triggered avalanches in Gravelly Range. Riders did not have beacons or rescue equipment. Riders made it out safe luckily."

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
2
D size
2
Problem Type
Wind Slab
Slab Thickness
18.0 inches
Vertical Fall
200ft
Slab Width
200.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

From FB message: "Two snowmobiler triggered avalanches in Gravelly Range. Riders did not have beacons or rescue equipment. Riders made it out safe luckily."

Out of Advisory Area, 2025-02-10

Small rider triggered Avalanche Lionhead

LIONHEAD AREA
Lionhead Range
Code
SS-AM-R1-D1
Aspect
S
Latitude
44.72920
Longitude
-111.32300
Notes

We saw this today after it happened. Looked like a snowmobile triggered it. I believe it is mostly south facing. Thanks. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
1
D size
1
Slab Thickness
12.0 inches
Vertical Fall
75ft
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Natural wind slab avalanche near Cooke

Wolverine Peak
Cooke City
Code
HS-N-R1-D1.5-S
Elevation
9900
Aspect
E
Latitude
45.05300
Longitude
-110.01000
Notes

On Feb 9 We saw a fresh natural wind slab near Wolverine, R1-D1.5

 

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
1
D size
1.5
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind Slab
Slab Thickness
12.0 inches
Vertical Fall
200ft
Slab Width
50.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Snowboarder triggered wind slabs (2) near Cooke

Scotch Bonnet
Cooke City
Code
SS-AS-R1-D2-S
Elevation
9500
Aspect
SE
Latitude
45.07330
Longitude
-109.94800
Notes

We watched two snowboarders trigger separate wind slabs, while riding one at a time in avalanche terrain, on the south side of Scotch Bonnet (photos attached). They rode away safely. These looked 12" deep and 20' wide, and entrained snow to run a good distance, R1-D2.

 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
1
D size
2
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind Slab
Slab Thickness
12.0 inches
Vertical Fall
500ft
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

On Feb 9 we watched two snowboarders trigger separate wind slabs, while riding one at a time in avalanche terrain, on the south side of Scotch Bonnet. Photo: J. Mancey

 

Cooke City, 2025-02-10