Northern Gallatin

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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    • 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
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