Cooke City

Apr 5 Wind slabs were still reactive. We triggered 3 small, 3-8" deep x 5-15' wide, hard wind (1F+) slabs on convex test slopes well below the main ridgelines. 9,800', NE aspects. Also triggered one softer (4F) wind slab just below the high ridgeline, 10,200', NE aspect. 10-15' wide x 6-8" deep (Pictured). Photo: GNFAC

Cooke City, 2025-04-06

Reactive wind slabs, future wet snow hazards

Date
Activity
Skiing

We skied near Henderson Mtn. and Lulu Pass. Skies were clear with a light breeze near the ridgelines. Temperatures stayed below or just barely above freezing.

We saw a couple 3-6" deep natural wind slab avalanches and a few dry loose slides that looked to have happened within the last 24 hours. On southerly slopes below 9,000' there were some wet loose slides from yesterday afternoon. 

Wind slabs were still reactive today. We triggered 3 small, 3-8" deep x 5-15' wide, hard wind (1F+) slabs on convex test slopes well below the main ridgelines. 9,800', NE aspects. Also triggered one softer (4F) wind slab just below the high ridgeline, 10,200', NE aspect. 10-15' wide x 6-8" deep.

Snow stayed dry on northerly/shady slopes. Any sunny slopes got moist and had a crust formed by late this afternoon. We did not notice any fresh wet loose slides or roller balls on southerly slopes above 9,000'.

Stay alert for unstable drifts of snow, wind slabs formed last week are still breaking. Anticipate wet snow hazards to increase in size and distribution as the days get hotter this week.

Region
Cooke City
Location (from list)
Henderson Mountain
Observer Name
Alex Marienthal

Wind Slab Avalanche Near Cooke

COOKE CITY
Cooke City
Code
SS-ASc-R1-D1-I
Elevation
10100
Aspect
N
Latitude
45.02020
Longitude
-109.93800
Notes

Wind slab near Cooke City from yesterday.  Intentionally triggered.  North aspect, 10,100'.  1' deep, 20' wide.

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
12.0 inches
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Wind Slab Near Cooke

Date
Activity
Skiing

Wind slab near Cooke City from yesterday.  Intentionally triggered.  North aspect, 10,100'.  1' deep, 20' wide.

 

Region
Cooke City
Location (from list)
COOKE CITY
Observer Name
B. Fredlund

Skier Triggered Wind Slab - Ice Cream Scoop

Woody Ridge
Cooke City
Code
SS-ASu-R1-D1-S
Elevation
9280
Aspect
N
Latitude
45.00270
Longitude
-109.91700
Notes

Ice Cream Scoop on Skiers Left Side in Gully, North Aspect, 9280'

SS-ASu-R1-D1-S

One of the few spots on the gully where there are no trees as a wind block on the skiers left (south) side. Noticed a few cornices on south side of gully where it is exposed to W/SW/S winds. Skier took a left turn under cornices to scrub speed and released a 6-10" windslab 40' wide which ran 10' at most. Super soft and easy to ski through. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind Slab
Slab Thickness
10.0 inches
Slab Width
40.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skier took a left turn under cornices to scrub speed and released a 6-10" windslab 40' wide which ran 10' at most. Super soft and easy to ski through. Photo: J Lee

Cooke City, 2025-04-03

Skier Triggered Wind Slab - Ice Cream Scoop

Date
Activity
Skiing

Ice Cream Scoop on Skiers Left Side in Gully, North Aspect, 9280'

SS-ASu-R1-D1-S

One of the few spots on the gully where there are no trees as a wind block on the skiers left (south) side. Noticed a few cornices on south side of gully where it is exposed to W/SW/S winds. Skier took a left turn under cornices to scrub speed and released a 6-10" windslab 40' wide which ran 10' at most. Super soft and easy to ski through. 

Region
Cooke City
Location (from list)
Woody Ridge
Observer Name
Jerick Lee