Northern Gallatin

Small skier triggered slide on Wheeler

Wheeler Mountain
Northern Gallatin
Code
SS-AS-R1-D1-S
Elevation
7500
Aspect
N
Latitude
45.50970
Longitude
-111.08200
Notes

From obs (4/12/20: "While on a tour today up Wheeler, I was able to release a small dry loose slide on a N. aspect at 7500 feet. The slide was about 8 inches deep and only ran for 100 feet."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Images
Skier triggered small dry slab on Wheeler
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Cornice fall avalanche MT. Blackmore

Mt Blackmore
Northern Gallatin
Code
C-NC-R2-D2-O
Elevation
10000
Aspect
N
Latitude
45.44440
Longitude
-111.00400
Notes

From IG message (4/10/20): "Huge cornice release on north face of Blackmore today around 11am. North face was not hot yet but I am guessing the rocks on the back side transferred the heat?"

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Cornice fall
Trigger
Cornice fall
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Wind-Drifted Snow
Vertical Fall
700ft
Slab Width
40.00ft
Images
Cornice fall avalanche MT. Blackmore debris close up
Cornice fall avalanche MT. Blackmore
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

From IG message (4/10/20): "Huge cornice release on north face of Blackmore today around 11am. North face was not hot yet but I am guessing the rocks on the back side transferred the heat?" Photo: @graeme.emerson

Avalanche Details: Cornice fall avalanche MT. Blackmore
Forecast link: GNFAC Avalanche Forecast for Mon Apr 13, 2020
Northern Gallatin, 2020-04-11
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    • Natural avalanche in Mirror Basin

    Beehive Peak
    Northern Madison
    Code
    HS-N-R2-D2-O
    Elevation
    10200
    Aspect
    N
    Latitude
    45.35390
    Longitude
    -111.40500
    Notes

    From obs (4/8/20): "My partner and I noticed this slide as we summited 10602 at approximately 10:30am, which is when I took the first photo and was able to capture the full runout. After our descent of the peak, we skinned back up to the slide to get a better look (the second photo). The slide appeared approximately a day old, with a crown 1-2 feet deep, on an almost directly north-facing aspect at 10200" elevation. It broke right along the rocks that had heated up in the sun, and was around 200-300 feet at its widest. We did not get close enough to determine which layer failed (suspected wind from the heavy wind-crust in the neighboring area), but the debris at the bottom indicated it was a wet slide."

    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
    Wind-Drifted Snow
    Slab Thickness
    18.0 inches
    Vertical Fall
    600ft
    Slab Width
    200.00ft
    Images
    N. Madison wet slide
    N. Madison wet slide runout
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    19-20

    From obs (4/8/20): "My partner and I noticed this slide as we summited 10602 at approximately 10:30am, which is when I took the first photo and was able to capture the full runout. After our descent of the peak, we skinned back up to the slide to get a better look (the second photo). The slide appeared approximately a day old, with a crown 1-2 feet deep, on an almost directly north-facing aspect at 10200" elevation. It broke right along the rocks that had heated up in the sun, and was around 200-300 feet at its widest.

    Avalanche Details: Natural avalanche in Mirror Basin
    Northern Madison, 2020-04-09
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