20-21

Natural Avalanches West of Cooke City

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

Skiers observed several natural avalanches west of Cooke City. All were on wind-loaded slopes. Varying size and destructive potential. 

Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
Problem Type
Wind-Drifted Snow
Images
Natural Avalanche, West of Cooke City
Natural Avalanche, West of Cooke
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
20-21

Natural, North Face Alex Lowe

Alex Lowe Peak
Northern Gallatin
Code
HS-N-R3-D2.5-O
Aspect
N
Latitude
45.42720
Longitude
-111.01400
Notes

From Obs: "One large avalanche observed, on the path adjacent to the N Couloir on Alex Lowe. More or less went full path, I would estimate 2m max crown depth. HS-N-R4/D2.5-O. A large cornice fell on the NF of Blackmore with no slab results. Observed several size 1 slabs that failed within new snow during the day on N aspects."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
3
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
200.0 centimeters
Images
Alex Lowe N Aspect
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
20-21

From Obs 2/9/21: "Up/down the SE Ridge of Blackmore today. No cracking/collapsing observed. One large avalanche observed, on the path adjacent to the N Couloir on Alex Lowe. More or less went full path, I would estimate 2m max crown depth. HS-N-R4/D2.5-O. Observed several size 1 slabs that failed within new snow during the day on N aspects." Photo: S. Hennessey

Avalanche Details: Natural, North Face Alex Lowe
Forecast link: GNFAC Avalanche Forecast for Wed Feb 10, 2021GNFAC Avalanche Forecast for Thu Feb 11, 2021
Northern Gallatin, 2021-02-09
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    • Natural avalanches along Bridger Ridge

    Bridger Peak
    Bridger Range
    Code
    HS-N-R3-D2.5-O
    Elevation
    8600
    Aspect
    NE
    Latitude
    45.77010
    Longitude
    -110.94000
    Notes

    Seen on 2/9/21: Many natural avalanche crowns along the Bridger Ridge that ran during the storm from 2/4-2/8, likely between 2/5-2/7. Across all of Bridger Peak, some on Baldy Peak, Many through The Pinnacles, Argentina Bowl and Saddle.

    Number of slides
    5
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Hard slab avalanche
    Trigger
    Natural trigger
    R size
    3
    D size
    2.5
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    30.0 inches
    Vertical Fall
    1700ft
    Slab Width
    1000.00ft
    Images
    Natural avalanche on Bridger Peak
    Natural Avalanche East of Baldy Pk
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    20-21

    Natural Avalanches on Cedar mountain

    Cedar Mtn.
    Northern Madison
    Code
    SS-N-R2-D3-O
    Elevation
    9600
    Aspect Range
    E-N
    Latitude
    45.22680
    Longitude
    -111.51200
    Notes

    I observed 4 avalanches that broke at a variety of aspects and elevations on Cedar Mountain during the tail end of the storm, likely Feb. 5-8, 2021

    Number of slides
    4
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Natural trigger
    R size
    2
    D size
    3
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Images
    Natural Avalanche, Cedar Mountain 2
    Natural Avalanche, Cedar Mountain
    Large natural avalanche, Cedar
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    20-21

    Blackmore

    Date

    Up/down the SE Ridge of Blackmore today. HST approaching 1m, moderate to strong winds have scoured many aspects in this area. No cracking/collapsing observed. One large avalanche observed, on the path adjacent to the N Couloir on Alex Lowe. More or less went full path, I would estimate 2m max crown depth. HS-N-R4/D2.5-O. A large cornice fell on the NF of Blackmore with no slab results. Wind transport is ongoing with lots of AS and mod W winds. Observed several size 1 slabs that failed within new snow during the day on N aspects. Cold up there!

    Observer Name
    Sam H
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