23-24

Rider Triggered New Snow Slab

Northern Gallatin
Code
AMr-R2-D1.5-I
Notes

Photo from IG, slide occurred night of 3/1.

Number of slides
1
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
2
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Images
Rider triggered new snow slab 03/01
Snow Observation Source
Rider triggered new snow slab
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
23-24

Rider Triggered Avalanche on Henderson Mountain

Henderson Mountain
Cooke City
Code
HS-AMr-R3-D3-O
Aspect
E
Latitude
45.05240
Longitude
-109.94500
Notes

Riders triggered a very large avalanche on the east side of Henderson Mountain while riding across a slope below. No one was caught in the avalanche and the debris pile was estimated 20' deep in spots. 

From another obs. "Watched a large avalanche come down the big Avi path on the east side of Henderson.  The avalanche covered many snowmobile tracks from that afternoon.  The crown varied and extended for 1,000 feet below the summit ridge. It was a huge volume of snow that reached Fisher Creek. The snowmobilers were lucky, as it was large enough to be buried deep."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
3
D size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
60.0 inches
Vertical Fall
1500ft
Slab Width
1000.00ft
Images
Cooke City 3.2.24
Avalanche on Henderson Mountain, 4
Avalanche on Henderson Mountain, 3
Avalanche on Henderson Mountain, 2
Avalanche on Henderson Mountain, 1
Snow Observation Source
Avalanche on Henderson Mountain
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
23-24

Riders triggered a very large avalanche on the east side of Henderson Mountain while riding across a slope below. No one was caught in the avalanche and the debris pile was estimated 20' deep in spots. Photo: J. Tocco

Avalanche Details: Rider Triggered Avalanche on Henderson Mountain
Forecast link: GNFAC Avalanche Forecast for Sun Mar 3, 2024
Cooke City, 2024-03-02
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    • Riders triggered a very large avalanche on the east side of Henderson Mountain while riding across a slope below. No one was caught in the avalanche and the debris pile was estimated 20' deep in spots. Photo: J. Tocco

    Avalanche Details: Rider Triggered Avalanche on Henderson Mountain
    Forecast link: GNFAC Avalanche Forecast for Mon Mar 4, 2024
    Cooke City, 2024-03-02
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    • Natural Avalanches on Scotch Bonnet

    Lulu Pass
    Cooke City
    Code
    N-R3-D2
    Aspect
    SE
    Aspect Range
    E-SE
    Latitude
    44.95680
    Longitude
    -109.61100
    Notes

    From obs: "Multiple avalanches on Rasta Chutes on Scotch Bonnet. Did not run full path but probably 3/4 at least. Crowns were 2-4’. Debris pile by the up track to tregencic was probably 6-8’ deep."

    Number of slides
    2
    Number caught
    0
    Number buried
    0
    Trigger
    Natural trigger
    R size
    3
    D size
    2
    Images
    Natural Avalanche on Scotch Bonnet
    Debris Pile Below Rasta Chutes
    Natural Avalanche Rasta Chutes
    Snow Observation Source
    Lots of naturals on multiple aspects
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Multiple Avalanches
    Advisory Year
    23-24
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