23-24

Large Snowmobiler Triggered Avalanche, Cooke City

Scotch Bonnet
Cooke City
Code
HS-AM-R3-D3-O
Elevation
10200
Aspect
N
Latitude
45.07350
Longitude
-109.94500
Notes

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. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
R size
3
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
60.0 inches
Vertical Fall
1000ft
Slab Width
400.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Natural Avalanches in Cooke City

COOKE CITY
Cooke City
Code
SS-N-R2-D2-O
Elevation
10000
Aspect
E
Latitude
45.02020
Longitude
-109.93800
Notes

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.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Natural Avalanche, Red Mountain

Red Mountain
Butte Area
Code
N-R3-D1.5-O
Elevation
9600
Aspect
N
Latitude
45.76480
Longitude
-112.48600
Notes

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."

Number of slides
1
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
3
D size
1.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
10.0 inches
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Collapsing Bracket Creek

Brackett Creek
Bridger Range
Code
Latitude
45.85490
Longitude
-110.93000
Notes

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. "

Number of slides
0
Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year