18-19

Cracking and Collapsing in Henry's Mountains

LIONHEAD AREA
Lionhead Range
Code
Latitude
44.66410
Longitude
-111.35600
Notes

Cracking and collapsing on a 31-degree slope near the Lionshead area down south. The slab was 3-4' deep, and the slope was on the verge of being steep enough to avalanche. From the email: " fractured about 20’x10’ area initially, maybe 3-4’ deep. We got off the hill and it continued to fracture in bigger spots but did not slide more than a foot total." Photo: S. Thompson

Number of slides
1
Number caught
0
Number buried
0
Number killed
0
Images
Cracking and Collapsing in Henry's Mountains
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
18-19

Cracking and collapsing on a 31-degree slope near the Lionshead area down south. The slab was 3-4' deep, and the slope was on the verge of being steep enough to avalanche. From the email: " fractured about 20’x10’ area initially, maybe 3-4’ deep. We got off the hill and it continued to fracture in bigger spots but did not slide more than a foot total." Photo: S. Thompson

Avalanche Details: Cracking and Collapsing in Henry's Mountains
Lionhead Range, 2019-01-27
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    • Big Natural Avalanches in the Bridgers

    BRIDGER RANGE
    Bridger Range
    Code
    HS-N-R3-D2.5-O
    Elevation
    8200
    Aspect Range
    E-NE
    Latitude
    45.84860
    Longitude
    -110.94600
    Notes

    Skiers in the Bridgers saw multiple large natural avalanches in the Bridgers that had released during recent snow and wind loading. From the email: "Looks like things really went off in the Bridgers in the last few days. Loads of natural avalanche activity, much of it appearing to fail on deeper layers than the new/old interface." Photo: B. VandenBos

    Multiple Avalanches
    Number of slides
    6
    Number caught
    0
    Number buried
    0
    Number killed
    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
    60.0 inches
    Images
    Big Natural Avalanches in the Bridgers (3)
    Big Natural Avalanches in the Bridgers (2)
    Big Natural Avalanches in the Bridgers
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    18-19

    Skiers in the Bridgers saw multiple large natural avalanches in the Bridgers that had released during recent snow and wind loading. From the email: "Looks like things really went off in the Bridgers in the last few days. Loads of natural avalanche activity, much of it appearing to fail on deeper layers than the new/old interface." This is the third large avalanche that has been reported on Bridger Peak this season. Photo: B. VandenBos

    Avalanche Details: Big Natural Avalanches in the Bridgers
    Bridger Range, 2019-01-27
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    • Skiers in the Bridgers saw multiple large natural avalanches in the Bridgers that had released during recent snow and wind loading. From the email: "Looks like things really went off in the Bridgers in the last few days. Loads of natural avalanche activity, much of it appearing to fail on deeper layers than the new/old interface." This avalanche in the Hourglass was triggered by a large chunk of cornice that broke off. Photo: B. VandenBos

    Avalanche Details: Big Natural Avalanches in the Bridgers
    Bridger Range, 2019-01-27
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    • Skiers in the Bridgers saw multiple large natural avalanches in the Bridgers that had released during recent snow and wind loading. From the email: "Looks like things really went off in the Bridgers in the last few days. Loads of natural avalanche activity, much of it appearing to fail on deeper layers than the new/old interface." Photo: B. VandenBos

    Avalanche Details: Big Natural Avalanches in the Bridgers
    Bridger Range, 2019-01-27
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    • Skier triggered near Bradley's meadow

    Bradley Meadow
    Bridger Range
    Code
    SS-ASu-R3-D1.5-S
    Elevation
    7200
    Aspect
    SE
    Latitude
    45.82950
    Longitude
    -110.92700
    Notes

    A skier triggered this slide around two o'clock in Bradley's Meadow on 1/26. From e-mail: "The snow propagated when I made my first turn on a convex roll above the slope skiers right of the main meadow, just before the flat area before going up The Ramp. The slab broke right under my feet and propagated 20-25 feet on either side of me. The crown was 7" deep where I triggered it but some spots of it were as deep as 13". My friends and I decided that the slide was R3 and D1-D2. Luckily I was able to ski out of the slide right when it propagated so no one was caught in it."

    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
    3
    D size
    1.5
    Bed Surface
    S - Avalanche released within new snow
    Problem Type
    New Snow
    Slab Thickness
    10.0 inches
    Vertical Fall
    150ft
    Slab Width
    50.00ft
    Images
    Skier triggered avalanche on Bradley's Meadow debris
    Skier triggered avalanche on Bradley's Meadow
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    18-19

    Skiers triggered this avalanche in dense trees while ascending Mt. Ellis. From the email: "While subsequently skiing up through dense trees climbing to the north to attempt to reach the mid section of the going-home chute, a medium-size bowl-shaped opening in the trees released a soft slab just as we were entering the opening. The crown was ~24” deep and ~80-100’ across. Total snow depth in that area was less than three feet. The avalanche ran probably 500 vertical feet down a shallow gully. Neither my partner nor I where caught but way too close for comfort"

    Avalanche Details: Skier Triggered Avalanche Mt. Ellis
    Northern Gallatin, 2019-01-27
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    • Skier Triggered Avalanche Mt. Ellis

    Mt Ellis
    Northern Gallatin
    Code
    SS-ASu-R2-D2-O
    Elevation
    7500
    Aspect
    NE
    Latitude
    45.58290
    Longitude
    -110.95400
    Notes

    Skiers triggered this avalanche in dense trees while ascending Mt. Ellis. From the email: "While subsequently skiing up through dense trees climbing to the north to attempt to reach the mid section of the going-home chute, a medium-size bowl-shaped opening in the trees released a soft slab just as we were entering the opening. The crown was ~24” deep and ~80-100’ across. Total snow depth in that area was less than three feet. The avalanche ran probably 500 vertical feet down a shallow gully. Neither my partner nor I where caught but way too close for comfort."

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Number killed
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Skier
    Trigger Modifier
    u-An unintentional release
    R size
    2
    D size
    2
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    24.0 inches
    Vertical Fall
    500ft
    Slab Width
    100.00ft
    Images
    Skier Triggered Avalanche Mt. Ellis (3)
    Skier Triggered Avalanche Mt. Ellis (2)
    Skier Triggered Avalanche Mt. Ellis (1)
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    18-19
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