19-20

A rider triggered and was caught in this slide on 12/14. From e-mail: "...Rider was approaching blind roll over from the top when slide was triggered at the visible crown.  Rider attempted to bail, but both the individual and machine were carried over and through the rocks and strainers below.  Rider and machine were deposited in the debris pile as seen in pictures.  Rider was unharmed.  Machine was pretty well trashed...." Photo: A. Bertolino

Avalanche Details: Snowmobile triggered/caught on Mt. Abundance near Cooke
Forecast link: GNFAC Avalanche Forecast for Mon Dec 16, 2019
Cooke City, 2019-12-15
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    • A rider triggered and was caught in this slide on 12/14 near Cooke City. From e-mail: "...Rider was approaching blind roll over from the top when slide was triggered at the visible crown.  Rider attempted to bail, but both the individual and machine were carried over and through the rocks and strainers below.  Rider and machine were deposited in the debris pile as seen in pictures.  Rider was unharmed.  Machine was pretty well trashed...." Photo: A. Bertolino

    Avalanche Details: Snowmobile triggered/caught on Mt. Abundance near Cooke
    Cooke City, 2019-12-15
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    • Snowmobile triggered/caught on Mt. Abundance near Cooke

    Mt. Abundance
    Cooke City
    Code
    HS-AMu-R3-D2.5-O
    Elevation
    9200
    Aspect
    E
    Latitude
    45.06420
    Longitude
    -110.01100
    Notes

    From IG post: "Pictures don’t do this monster avalanche justice. We helped the kid recover his sled, which was buried between 4and 10 feet. luckily it wasn’t him and no one was hurt." @mackleymtvet

    E-mail from uninvolved group: "Incident occurred on an East aspect of the far south shoulder of Abundance.  Did not witness incident or know the party involved, but arrived shortly after it occurred. Involved party was still on scene. Rider was approaching blind roll over from the top when slide was triggered at the visible crown. Rider attempted to bail, but both the individual and machine were carried over and through the rocks and strainers below. Rider and machine were deposited in the debris pile as seen in pictures. Rider was unharmed. Machine was pretty well trashed. Information based on first person observation and rider testimony."

     

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Hard slab avalanche
    Trigger
    Snowmobile
    Trigger Modifier
    u-An unintentional release
    R size
    3
    D size
    2.5
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    36.0 inches
    Vertical Fall
    300ft
    Slab Width
    600.00ft
    Weak Layer Grain type
    Solid faceted particles
    Weak Layer grain size
    1.00mm
    Weak Layer Hardness
    F
    Images
    Snowmobile triggered slide Mt. Abundance 5
    Snowmobile triggered slide Mt. Abundance 4
    Snowmobile triggered slide Mt. Abundance 3
    Snowmobile triggered slide Mt. Abundance 2
    Snowmobile triggered slide Mt. Abundance
    Attached Videos
    Avalanches on Crusts, Cooke City - 16 Dec 2019
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    19-20

    From IG post: "Pictures don’t do this monster avalanche justice. We helped the kid recover his sled, which was buried between 4and 10 feet. luckily it wasn’t him and no one was hurt." @mackleymtvet

    Avalanche Details: Snowmobile triggered/caught on Mt. Abundance near Cooke
    Forecast link: GNFAC Avalanche Forecast for Sun Dec 15, 2019
    Cooke City, 2019-12-14
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    • Three snowmobile triggered avalanches near Cooke City

    Crown Butte
    Cooke City
    Code
    SS-AMu-R1-D2-O
    Aspect
    SE
    Latitude
    45.05250
    Longitude
    -109.96200
    Notes

    From email: "Saw 3 different slides today, all had sled tracks near or into them, and were breaking from rocks... The other slides were smaller, had broken from rocks at the top of ridges. Also saw some cracking mid slope, on this same aspect, a ridge over down left of this photo."

    Photo is of avalanche on SE aspect of Crown Butte.
     

    Number of slides
    3
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Snowmobile
    Trigger Modifier
    u-An unintentional release
    R size
    1
    D size
    2
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Images
    Snowmobile triggered on Crown Butte 2
    Snowmobile triggered slide on Crown Butte
    Avalanche on Crown Butte
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    19-20

    From email: "Saw 3 different slides today, all had sled tracks near or into them, and were breaking from rocks.... The other slides were smaller, had broken from rocks at the top of ridges.... Crown butte, SE facing" Photo: S. Strenge

     

    Avalanche Details: Three snowmobile triggered avalanches near Cooke City
    Forecast link: GNFAC Avalanche Forecast for Sun Dec 15, 2019
    Cooke City, 2019-12-14
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    • Slat Creek - 2nd Hand Report

    Buck Ridge
    Northern Madison
    Code
    U-AM
    Latitude
    45.17190
    Longitude
    -111.38000
    Notes

    While teaching up at Second Yellowmule we received a secondhand report of riders in the Slat Creek area triggering 4 avalanches. It sounds like no one was caught, injured, or buried. 

    Number of slides
    4
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Unknown
    Trigger
    Snowmobile
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    19-20
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