19-20

Natural avalanche on Cedar Mountian

Cedar Mtn.
Northern Madison
Code
SS-N
Latitude
45.23660
Longitude
-111.50600
Notes

"Looking out from Big Sky I noticed two (possibly connected) crowns near the ridge top."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Wind slab avalanche on Ross Peak, Bridgers

Ross Peak
Bridger Range
Code
SS-N-S
Elevation
9000
Aspect
NE
Latitude
45.85860
Longitude
-110.95600
Notes

"Skied the low angle trees on the NW side of Ross today around 8000 ft. Saw a natural wind slab that had released during the day around 9000 ft. NE aspect, I'd estimate 40 degree slope but I wasn't very close. Moderate to strong winds most of the day."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind-Drifted Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

"Large crown in lower meadows west side of beehive basin above jack creek. Both meadows in lower fight of photo went. Southwest aspect. Far right meadow crown is visible and entire face went. Left meadow is hard to see but 1/3 of face slid. I would guess 3-6 foot crown from how visible it was from moonlight." Photo: Chad Wilkinson

Avalanche Details: Natural Avalanches West of Beehive Peak
Forecast link: GNFAC Avalanche Forecast for Tue Feb 11, 2020
Northern Madison, 2020-02-10
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    • Small natural and human triggered avalanches in Cooke

    COOKE CITY
    Cooke City
    Code
    SS-N-R2-D2
    Latitude
    45.02020
    Longitude
    -109.93800
    Notes

    1. "...a fresh avalanche observed out there today.  A south aspect around 9400', estimated to be 2-3' deep and 75' wide. Also observed 2 thinner wind slab avalanches that also ran naturally within the last 48 hrs, and were both about 1' deep and 50' wide.  One was a SE aspect, and one was a North aspect." See attached photo Natural avalanche 2-3' deep.

    2. "We’ve seen many instances of cracking and wind slab breaks the past two days riding in Cooke, most happened as we sledded past or down the slope. The 1st and 2nd photo are 4” deep breaks at most. The last photo/slide we observed today, S facing slope, not sure how it was triggered, a foot deep crown at most." See attached photos Small 1' deep, Human triggered 1&2.

    Number of slides
    4
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Natural trigger
    R size
    2
    D size
    2
    Problem Type
    New Snow
    Images
    Natural avalanche 2-3' deep in Cooke
    Small 1' deep avalanche in Cooke City
    Human triggered small avalanche in Cooke_2
    Human triggered small avalanche in Cooke_1
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    19-20

    Truman Gulch Natural Deep Slabs

    Truman Gulch
    Bridger Range
    Code
    HS-N-R4-D3.5-O
    Elevation
    8500
    Aspect Range
    NW-W-SW-S
    Latitude
    45.81390
    Longitude
    -110.93300
    Notes

    Avalanche crowns spanned almost the entire ridge of Truman Gulch. They connected, but appeared to run at different times. The most recent was probably last night behind the Patrol lift. Looked very fresh today without any snow on it. In your face/Catch a wave was a day or two old.

    All of Jones Crk also went as well as almost every sub ridge towards Ross Peak.

    Number of slides
    3
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Hard slab avalanche
    Trigger
    Natural trigger
    R size
    4
    D size
    3.5
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    48.0 inches
    Vertical Fall
    2000ft
    Slab Width
    4000.00ft
    Weak Layer Grain type
    Faceted Crystals
    Slab Layer Grain Type
    Precipitation Particles
    Images
    Truman Gulch Deep Debris 2
    Truman Gulch Deep Crown 2
    Truman Gulch Deep Debris 1
    Truman Gulch Deep Crown 1
    Widespread Avalanche Crowns Bridger West Side
    Attached Videos
    Widespread Natural Deep Avalanches, Bridgers - 9 Feb
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    19-20
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