19-20

Large natural on E side Woody Ridge, Cooke

Woody Ridge
Cooke City
Code
SS-N-R1-D2-O
Elevation
10200
Aspect
E
Latitude
44.97390
Longitude
-109.92400
Notes

From an observation, " Climax slid quite large several days ago. We could get a good look at the crown because of the wind, but I’m guessing it was a wind slab that stepped down."

"Climax" is the what the locals call the large east face on Woody Ridge above Hayden Creek.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

"...picture is a close up of the avalanche on the ridge between Elephant and Blackmore on a south aspect. This one was the largest and the most fresh. All avalanches appeared to be naturally triggered from wind loading." Photo: T. Chingas

Avalanche Details: Many natural avalanches on Mt Blackmore
Forecast link: GNFAC Avalanche Forecast for Tue Feb 18, 2020
Northern Gallatin, 2020-02-17
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  • Original

    • Collapsing and Cracking on Black Mtn, N Madison

    Black Mountain
    Northern Madison
    Code
    Aspect Range
    S-SE
    Latitude
    45.16280
    Longitude
    -111.52900
    Notes

    While touring up black mountain on Saturday, February 15th 2020, our group heard very loud whoofing on flat ground, collapsing large areas. There was small cracks formed but we were on very low angle slopes. We switched to a back-up plan to get down. A second large whoofing occurred minutes later a short distance away from the first. This time we could feel the snow drop below us by a few inches. We turned around and followed our tracks down. We dug two pits in the vicinity of the collapsing. Two extended column tests produced failures on the same depth hoar at the ground, ECTP 23 and ECTP 16. The latter result was on a pit of at least a meter deep. WE collapsed another flat while skiing down. No other obvious signs of instability were seen.

    Number of slides
    0
    Number caught
    0
    Number buried
    0
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Red Flag
    Advisory Year
    19-20
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