19-20

A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast. Photo: GNFAC

Bridger Range, 2020-02-08

A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. Huge avalanches like this are likely and can be triggered by a human for the next couple days. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast. This heavy load is overloading a fragile snowpack, especially on wind loaded slopes. Travel conservatively. Photo: GNFAC

Bridger Range, 2020-02-08

A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. Huge avalanches like this are likely and can be triggered by a human for the next couple days. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast. This heavy load is overloading a fragile snowpack, especially on wind loaded slopes. Travel conservatively. Photo: GNFAC

Bridger Range, 2020-02-08

A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. Huge avalanches like this are likely and can be triggered by a human for the next couple days. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast. This heavy load is overloading a fragile snowpack, especially on wind loaded slopes. Travel conservatively. Photo: GNFAC

Bridger Range, 2020-02-08

A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. Huge avalanches like this are likely and can be triggered by a human for the next couple days. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast. This heavy load is overloading a fragile snowpack, especially on wind loaded slopes. Travel conservatively. Photo: GNFAC

Bridger Range, 2020-02-08

Several avalanches on Elephant Mtn on way to Mt. Blackmore

Elephant Mountain
Northern Gallatin
Code
SS-N-D2-I
Elevation
8800
Aspect
NW
Latitude
45.43820
Longitude
-110.99000
Notes

"Noted several avalanches (NW aspect ~ 8800') off of Elephant that traveled quite far into the trees where the summer trail typically runs, all appear to be new snow, D1- D2 in size, average 2' crowns, running on old/new interface from  Feb 2. They appear to have run midstorm, sometime yesterday (photos 1,2,3).  Above 9000', W Winds were crafting fresh wind slabs that were most reactive on a midstorm crystal/density change that buried a layer of stellars ~ 1' deep in shallower spots,  topped with denser snow." 

Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
24.0 centimeters
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural avalanches on Wheeler Mtn, N. Gallatin

Wheeler Mountain
Northern Gallatin
Code
SS-N-R3-D2
Elevation
8000
Aspect
SE
Latitude
45.50970
Longitude
-111.08200
Notes

"Noted two SS-D1.5/2 naturals (presuming based on lack of any sort of tracks) on Wheeler, typical spots for these conditions, both SE aspect around 8000'."

Dave Zinn dug a snowpit lookers right of the slides in the next path on Wednesday, 2/5, a couple days before the storm. He found weak snow that was ready to avalanche.

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
3
D size
2
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

"Noted several avalanches (NW aspect ~ 8800') off of Elephant that traveled quite far into the trees where the summer trail typically runs, all appear to be new snow, D1- D2 in size, average 2' crowns, running on old/new interface from  Feb 2. They appear to have run midstorm, sometime yesterday (photos 1,2,3).  Above 9000', W Winds were crafting fresh wind slabs that were most reactive on a midstorm crystal/density change that buried a layer of stellars ~ 1' deep in shallower spots,  topped with denser snow." Photo: G. Antoniolli

Northern Gallatin, 2020-02-08

"Noted several avalanches (NW aspect ~ 8800') off of Elephant that traveled quite far into the trees where the summer trail typically runs, all appear to be new snow, D1- D2 in size, average 2' crowns, running on old/new interface from  Feb 2. They appear to have run midstorm, sometime yesterday (photos 1,2,3).  Above 9000', W Winds were crafting fresh wind slabs that were most reactive on a midstorm crystal/density change that buried a layer of stellars ~ 1' deep in shallower spots,  topped with denser snow." Photo: G. Antoniolli

Northern Gallatin, 2020-02-08