22-23

Small, thin wind slabs triggered, Storm Castle Ridge

Moose Jaw
Northern Gallatin
Code
SS-ASu-R1-D1-S
Latitude
45.44940
Longitude
-111.07600
Notes

Today we toured up Storm Castle Ridge with hopes of skiing the 19th Street Couloir. On the approach we were able to trigger small (2-4") wind slabs on most lee aspects, these slides ran fast and far for their size. We dug a pit at 9200' on a North aspect and we're able to identify the surface hoar but had no results on our ECT.  With 2 spotters I dug an ECT 10m below the top of the 19th Street Couloir and got and ECTP12@ 35cm below the surface. The slab was 35cm thick, pencil hardness and failed on faceted snow; the buried surface hoar found in most other pits was not present. We bailed to the opposite side of the ridge and enjoyed some wonderful burn skiing. 

 

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-Drifted Snow
Slab Thickness
3.0 inches
Images
Small, thin wind slab avalanches, Hyalite
Snow Observation Source
Poor test scores on Storm Castle Ridge
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

Small avalanche off Two Top

Two Top
Lionhead Range
Code
SS-AMu-R1-D1-I
Latitude
44.62490
Longitude
-111.25900
Notes

Small avalanche broke while descending to less exposed areas.  Approximately 80 yards wide, 18” deep.  Slid for approximately 90 yards from crown. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Slab Thickness
18.0 inches
Vertical Fall
300ft
Slab Width
250.00ft
Images
Small avalanche off Two top_3
Small avalanche off Two top_2
Small avalanche off Two top_1
Snow Observation Source
Small avalanche off Two top, west Yellowstone
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

Small avalanche broke while descending to less exposed areas.  Approximately 80 yards wide, 18” deep.  Slid for approximately 90 yards from crown. 
 

 

Avalanche Details: Small avalanche off Two Top
Forecast link: GNFAC Avalanche Forecast for Thu Jan 19, 2023GNFAC Avalanche Forecast for Fri Jan 20, 2023GNFAC Avalanche Forecast for Sun Jan 22, 2023
Island Park, 2023-01-19
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    • Natural slab avalanche in Cooke

    COOKE CITY
    Cooke City
    Code
    SS-N
    Latitude
    45.02020
    Longitude
    -109.93800
    Notes

    East aspect, 10,300.  Estimated to be about 75' wide.  Likely occurred yesterday, Jan. 17th.  

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Natural trigger
    Images
    Natural slab avalanche in Cooke
    Snow Observation Source
    Natural slab avalanche in Cooke
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    22-23

    Natural slab avalanche in Cooke

    Date
    Activity
    Skiing

    East aspect, 10,300.  Estimated to be about 75' wide.  Likely occurred yesterday, Jan. 17th.  

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