20-21

Specimen Creek

Specimen Creek
Southern Gallatin
Code
SS-N-R2-D1-O
Elevation
8200
Aspect
SE
Latitude
45.02650
Longitude
-111.04800
Notes

From obs: "Observed 2 natural avalanches, both on the basal persistent layer I would guess. one maybe a week old, partially filled in (SS-N-D1R2-O), and one that ran in the last 24 hrs (SS-N-D1.5R2-O) on a SE aspect , 35 deg at 8200 ft. I thought it was interesting given the lack of new snow and seeming lack of strong winds in this area. 2/5 ECTs had propagation , we had two large collapses."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
1
Bed Surface
O - Old snow
Images
Natural Avalanche, Specimen Creek
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
20-21

From obs: "Observed 2 natural avalanches, both on the basal persistent layer I would guess. one maybe a week old, partially filled in (SS-N-D1R2-O), and one that ran in the last 24 hrs (SS-N-D1.5R2-O) on a SE aspect, 35 deg at 8200 ft. I thought it was interesting given the lack of new snow and seeming lack of strong winds in this area." Photo: S. Hennessey 

Avalanche Details: Specimen Creek
Forecast link: GNFAC Avalanche Forecast for Mon Feb 22, 2021GNFAC Avalanche Forecast for Tue Feb 23, 2021
Southern Gallatin, 2021-02-21
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    • Natural Avalanche, Northern Madison Range

    NORTHERN MADISON RANGE
    Northern Madison
    Code
    SS-N-R2-D2-O
    Latitude
    45.29520
    Longitude
    -111.41000
    Notes

    From email: "Observed natural deep slab probably happened overnight with the strong winds... snowpack in the area was about 3-5’ deep mostly 4F with 20+cm of F de depth hoar t the bottom... obviously not strong enough to support the windload."

    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
    Images
    Natural Avalanche, Northern Madison Range
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    20-21

    From email: "Observed natural deep slab probably happened overnight with the strong winds... snowpack in the area was about 3-5’ deep mostly 4F with 20+cm of F depth hoar at the bottom... obviously not strong enough to support the wind-load." Photo: T Thorn

    Avalanche Details: Natural Avalanche, Northern Madison Range
    Forecast link: GNFAC Avalanche Forecast for Tue Feb 23, 2021
    Northern Madison, 2021-02-21
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    • This large hard-slab avalanche was snowmobile-triggered on Saturday (2/20). It broke nearly 10' deep and approximately 200' across. Photo: GNFAC

    Avalanche Details: Snowmobile triggered Avalanches (2), McAtee Basin
    Forecast link: GNFAC Avalanche Forecast for Mon Feb 22, 2021GNFAC Avalanche Forecast for Tue Feb 23, 2021GNFAC Avalanche Forecast for Wed Feb 24, 2021
    Northern Madison, 2021-02-21
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