Northern Gallatin

Natural wet loose in Absarokas

Out of Advisory Area
Code
WL-N-R1-D1.5-S
Elevation
9000
Aspect
NE
Latitude
45.65530
Longitude
-110.55800
Notes

From obs 4/5/20: "...saw a ton of tracks and a lot of natural dry loose activity. D1-D1.5 slides on steep E to NE terrain between 8000 and 9500'. Everything pictured released between 1200 and 1400 when the sun was out. Looked like rollerballs were heating up on the cliffs and triggering dry loose slides below."

Number caught
0
Number buried
0
Avalanche Type
Wet loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1.5
Bed Surface
S - Avalanche released within new snow
Problem Type
Wet Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
19-20

Close up of a crystal from the surface hoar layer buried 2-3 feet deep north of Bridger Bowl and throughout most of the advisory area.

From 4/3/20: "I dug a quick pit at ~7450’ on a protected east 36 degree slope - HS 240cm...ECTP18@175 on 3-6mm preserved surface hoar (photos -1mm grid)... All results repeated identically in a second ECT... Seeing the reactive SH layer I opted out of skiing anything that had a distinct rollover or was steeper..." Photo: Z. Miller


Forecast link: GNFAC Avalanche Forecast for Mon Apr 6, 2020
Bridger Range, 2020-04-05
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    • From obs 4/4/20: "Avalanche, 4th of July Couloir, Beehive. No person was caught. A dog was caught but not buried. Crown between 2 and 5 inches, based on cracking depth during ascent and pictures. Runout aproximately 120x40 yards. Estimated using gaia gps."

    Avalanche Details: Skier triggered thin slab in Beehive
    Forecast link: GNFAC Avalanche Forecast for Sun Apr 5, 2020
    Northern Madison, 2020-04-04
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    • From obs 4/4/20: "Avalanche, 4th of July Couloir, Beehive. No person was caught. A dog was caught but not buried. Crown between 2 and 5 inches, based on cracking depth during ascent and pictures. Runout aproximately 120x40 yards. Estimated using gaia gps."

    Avalanche Details: Skier triggered thin slab in Beehive
    Forecast link: GNFAC Avalanche Forecast for Mon Apr 6, 2020
    Northern Madison, 2020-04-04
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    • Snowmobile triggered slab Portal Creek

    Portal Creek
    Northern Gallatin
    Code
    SS-AMu-R2-D2-O
    Latitude
    45.28900
    Longitude
    -111.14100
    Notes

    From obs. 4/4/20: "Avalanche today up portal creek. 2 1/2 ft crown and 4 - 5 ft runout. Triggered by snowmobile. Everyone was safe!"

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Snowmobile
    Trigger Modifier
    u-An unintentional release
    R size
    2
    D size
    2
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    30.0 inches
    Images
    Snowmobile triggered Portal Creek 2
    Snowmobile Triggered in Portal Creek
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    19-20
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