Northern Gallatin

East Face of Arden Peak (Peak 10,201)

Date
Activity
Snowboarding

Two large natural avalanches in Maid of the Mist Basin. One of them ran on the east face of Arden Peak (Peak 10,201) which propagated across the entire face. Could have been triggered by a cornice fall then stepped down to deeper layers. The second was on the NE face of the peak Fat Maid and Skinny Maid come from. Also propagated across the entire slope. Crown height between 6'-8' in most places.

Region
Northern Gallatin
Location (from list)
Maid of the Mist
Observer Name
Two Large Natural Avalanches

From obs: "While touring above the canyon this morning, I noticed a very recent wet slide (would guess this incident occurred yesterday afternoon, March 4th). This was a skier triggered slide on a E aspect at an elevation of 7200. This slide was roughly 50 feet wide and ran about 50 feet, I estimated this crown to be 2-3 feet deep, slid all the way to the ground. This occurred below a steep roller."

Photo: T. Saulnier

Avalanche Details: Small Skier Triggered Slide in Gallatin Canyon
Forecast link: GNFAC Avalanche Forecast for Sat Mar 6, 2021
Northern Madison, 2021-03-06
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    • Natural in Divide Basin

    Divide Cirque
    Northern Gallatin
    Code
    HS-N-R2-D2-O
    Elevation
    9800
    Aspect
    E
    Latitude
    45.39340
    Longitude
    -110.96900
    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Hard slab avalanche
    Trigger
    Natural trigger
    R size
    2
    D size
    2
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Images
    Divide Basin Natural Avalanche
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    20-21

    "Ran into this slide today. Tail end of Middle Basin. Seemed to have happened sometime in the last week (2/23-24). Most likely during the heavy windloading event. Seemed to run on very small facets we believe formed during the cold spell before the last big storm hit." Photo: S. Knowles
    Avalanche Details: Natural avalanche in Madisons
    Forecast link: GNFAC Avalanche Forecast for Fri Mar 5, 2021
    Northern Madison, 2021-03-04
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    • Natural slides in Hyalite Basin

    Hyalite - main fork
    Northern Gallatin
    Code
    Latitude
    45.38990
    Longitude
    -110.97700
    Notes

    These avalanches likely broke around 2/24/21 with other avalanche activity. One was above Hyalite Lake the others were, "Observed two dry-loose slides and one slab avalanche on the NE-facing slope of Peak 10,024 in the Shower Creek basin on Sunday (2/28/21) - all were presumably naturally triggered."

    Number caught
    0
    Number buried
    0
    Images
    Natural slides occurred on Peak 10,024 in Hyalite
    Natural avalanche near Hyalite Lake
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    20-21
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