Northern Gallatin

We looked at the avalanche in Hyalite that was triggered on Saturday 1/9/21. The slope angle was 33-35 degrees on the starting zone of the lookers right path. It broke 2-3’ deep on weak facets below a hard slab, 1000’ wide and the debris was 5-9’ deep. East aspect, 9,800’ elevation. Photo: GNFAC

Avalanche Details: Skier triggered large slide on Flanders Mountain
Forecast link: GNFAC Avalanche Forecast for Tue Jan 12, 2021GNFAC Avalanche Forecast for Thu Jan 14, 2021
Northern Gallatin, 2021-01-11
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    • Skiers triggered this avalanche on Flanders Mountain on 1/9/21. It was triggered out of the photo to the right on a seperate slope around the corner. It propagated over 1000' wide, and 2-4' deep. Photo: GNFAC

    Avalanche Details: Skier triggered large slide on Flanders Mountain
    Forecast link: GNFAC Avalanche Forecast for Sun Jan 10, 2021
    Northern Gallatin, 2021-01-11
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    • Skiers triggered this avalanche on Flanders Mountain on 1/9/21. It was triggered out of the photo to the right on a separate slope around the corner. It propagated over 1000' wide, and 2-4' deep. Photo: GNFAC

    Avalanche Details: Skier triggered large slide on Flanders Mountain
    Forecast link: GNFAC Avalanche Forecast for Mon Jan 11, 2021
    Northern Gallatin, 2021-01-11
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    • Lick creek eastside ECTP 10

    Date
    Activity
    Skiing

    ECTP 10, 15 cm slab breaking approximately 15 cm beneath new snow. East facing leeward slope. Approx 45.525, -110.952 elevation 7696. Surface hoar present on all slopes, approximately bottom 30 cm sugary facets.

    Region
    Northern Gallatin
    Location (from list)
    Lick Creek
    Observer Name
    Chris Black

    Couple large collapses in Hyalite Creek

    Hyalite - main fork
    Northern Gallatin
    Code
    Latitude
    45.44720
    Longitude
    -110.96200
    Notes

    From obs: "While ski touring in the Hyalite Creek Drainage today, my ski partner and I both, at separate times of the day, remote triggered sudden collapses. Each time, we felt the snow collapse underneath our feet, and then heard and felt a deep "whumph". The noise came from the North of us both times, where the slope was slightly steeper (still below about 28 degrees-- not colored with "slope angle shading" layer on caltopo.)."

    Number of slides
    0
    Number caught
    0
    Number buried
    0
    Problem Type
    Persistent Weak Layer
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Red Flag
    Advisory Year
    20-21

    Hyalite Creek Trail

    Date
    Activity
    Skiing

    While ski touring in the Hyalite Creek Drainage today, my ski partner and I both, at separate times of the day, remote triggered sudden collapses. Each time, we felt the snow collapse underneath our feet, and then heard and felt a deep "whumph". The noise came from the North of us both times, where the slope was slightly steeper (still below about 28 degrees-- not colored with "slope angle shading" layer on caltopo. The danger was rated as "moderate" in the Northern Gallatins today, so we were both extremely surprised by these events.

    I am also wondering if you have any women on your team, or if you are just "The Avalanche Guys"?

    Thanks so much for all that you do.

    Region
    Northern Gallatin
    Observer Name
    Ellie Nolan
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