24-25

Skier triggered Wind Slab Avalanches in Frazier Basin

Frazier Basin
Bridger Range
Code
SS-AS-R2-D1.5-S
Elevation
7500
Aspect
NE
Latitude
45.92780
Longitude
-110.96200
Notes

From obs: "Skier triggered wind slab on Northeast slope at 7,450 feet elevation. One skier was caught and carried roughly 10 feet before the slide came to a stop."

We also received reports from another group (IG story video) that triggered a couple similar sized wind slab avalanches in north facing chutes in Frazier Basin.

 

Number of slides
3
Number caught
1
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
2
D size
1.5
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind Slab
Slab Thickness
8.0 inches
Vertical Fall
100ft
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

small loose snow slides N. Bridgers

The Throne
Bridger Range
Code
L-N-R1-D1-S
Elevation
8500
Aspect
S
Latitude
45.88220
Longitude
-110.95200
Notes

The new snow was low density and sluffed easily on steep shady northerlies. On steep slopes facing the sun (south and east, and probably west) the new snow sat on a crust and became moist as the sun warmed it up and started to slide under skis. We saw a couple very small natural loose snow slides below rock outcrops on south facing slopes. Air temperatures were well below freezing, especially with wind chill, but the sun quickly warmed the recent new snow.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
Loose Dry
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Fresh reactive wind slabs N. Bridgers

The Throne
Bridger Range
Code
SS-ASc-R1-D1-S
Elevation
8300
Aspect
SE
Latitude
45.88220
Longitude
-110.95200
Notes

There was 6" of low density snow from yesterday. Winds were stronger than expected, from the north at the top of the Throne, and increased through the morning.

We found fresh drifts that were reactive, cracking easily and 5-10' wide out from our skis, on south and east facing slopes around 8000-8300'.

Number of slides
2
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
S - Avalanche released within new snow
Problem Type
Wind Slab
Slab Thickness
10.0 inches
Vertical Fall
100ft
Slab Width
10.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Shooting cracks in wind slab north of Cooke

Date
Activity
Skiing

From obs: "We found up to a 6” deep wind slab producing shooting cracks at Goose Lake on a NW facing slope at 10500ft."

Region
Cooke City
Location (from list)
Goose Lake
Observer Name
Noah Mattes

Wind Slab Avalanche in Frazier Basin

Date
Activity
Skiing
Skier triggered wind slab on Northeast slope at 7,450 feet elevation. One skier was caught and carried roughly 10 feet before the slide came to a stop.
Region
Bridger Range
Location (from list)
Frazier Basin
Observer Name
R. Bechtold