24-25

Skier triggered wind slab near Cooke

COOKE CITY
Cooke City
Code
SS-ASc-R1-D1
Elevation
9800
Aspect
N
Latitude
45.04710
Longitude
-109.99900
Notes

Today A Skier triggered a 6”x20’ wide wind slab on a N aspect at 9,800’.

 

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
Problem Type
Wind Slab
Slab Thickness
6.0 inches
Vertical Fall
200ft
Slab Width
20.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skier triggered and natural wet loose near Cooke

COOKE CITY
Cooke City
Code
WL-ASc-R1-D1.5-O
Elevation
1000
Aspect
SE
Latitude
45.02020
Longitude
-109.93800
Notes

Skiers triggered D1-D1.5 wet loose on SE aspect at 10,000’.

There were also natural small wet loose slides today and yesterday. Long running, but narrow, in steep terrain. Typically initiated near rock outcrops.

Today was hotter than yesterday and the top of the snowpack got pretty wet before clouds built in the afternoon. Snow stayed dry on due north up high. 

 

Number caught
0
Number buried
0
Avalanche Type
Wet loose-snow avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
1
D size
1.5
Bed Surface
O - Old snow
Problem Type
Loose Wet
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Skier triggered wind slabs and wet loose

Date
Activity
Skiing
Snowmobiling

Today A Skier triggered a 6”x20’ wide wind slab on a N aspect at 9,800’.

Skiers triggered D1-D1.5 wet loose on SE aspect at 10,000’.

There were also natural small wet loose slides today and yesterday. Long running, but narrow, in steep terrain. Typically initiated near rock outcrops.

Today was hotter than yesterday and the top of the snowpack got pretty wet before clouds built in the afternoon. Snow stayed dry on due north up high. 

 

Region
Cooke City
Location (from list)
COOKE CITY
Observer Name
Alex Marienthal

Variable Surface Conditions

Date
Activity
Skiing

We rode into Fairy Lake and climbed up to the Great One. Surface conditions ranged from gloppy, wet snow to firm, dry wind slabs with very little powder in between. There had been a fair amount of wind-slab and wet loose avalanche activity in the area over the weekend, but things were quite today. We had a report of a human-triggered wind slab avalanche in the Great One on Saturday. 

By 11:00 AM a layer of high clouds moved overhead and limited the melt-down input from the sun. Ambient temperatures reaching 50 degrees F didn't do the snow quality any favors at mid and low elevations but additionally didn't result in any natural wet snow avalanches that I saw. 

Wind-slabs were relatively thin (a couple inches to 8" thick). We did get cracking in a few drifts that was limited to the area directly influenced by our skis. We dug at the top of the Great One with unremarkable results and proceeded down the run. 

Tomorrow looks to be cooler with limited snow accumulation. If this forecast pans out, triggering an avalanche will be unlikely. Let's hope for more snow than is in the forecast!

Region
Bridger Range
Location (from list)
Fairy Lake
Observer Name
Dave Zinn

For years, the avalanche community has worked to understand and address the human factors that influence decision-making in the backcountry. With decades of research as their foundation, Sara Boilen and Ian McCammon are developing an open-source tool to help individuals mitigate risk in avalanche terrain. The project's first stage involves interviewing backcountry recreationalists who have been traveling in avalanche terrain for at least one season. All participants will be entered to win amazing raffle prizes (from Jones Snowboards, BCA, and more!).

No Region, 2025-04-07