24-25

Large natural avalanche south of Cooke

Republic Creek
Cooke City
Code
HS-N-R2-D2.5-O
Latitude
44.98550
Longitude
-109.94100
Notes

Skied south of Cooke today and noticed a large natural avalanche just north of the South Siren. N-R2-D2.5-O. It wasn't fresh and likely ran during the last storm cycle. 

We dug on an east aspect at 9800', ECTX, HS150. No cr, co.

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2.5
Bed Surface
O - Old snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Large natural avalanche south of Cooke

Date
Activity
Skiing

Skied south of Cooke today and noticed a large natural avalanche just north of the South Siren. N-R2-D2.5-O. It wasn't fresh and likely ran during the last storm cycle. 

We dug on an east aspect at 9800', ECTX, HS150. No cr, co.

 

Region
Cooke City
Location (from list)
Republic Creek
Observer Name
Nina Marienthal

Skier triggered avalanche north of Bridger boundary

Bradley Meadow
Bridger Range
Code
SS-AS-R2-D1
Latitude
45.83000
Longitude
-110.92800
Notes

Observed one avalanche in the steep chutes just outside the N Bridger Bowl boundary, SS-R2-D1-AS

HS between 150 and 200 cm. 90-120 cm of storm snow over firm mid Dec layers over facets. 15cm from the last few days. Some wind transport at mid elevations with lots of W wind up at ridgetop throughout the day. Much windier than expected in Bradley Meadow with moderate winds swirling from N and W. Sky was BKN and, no new snow. Temps around 10F.

 

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
2
D size
1
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Windy Day in the Bridgers

Date
Activity
Skiing

As my elevation increased, so did the wind. Heavy gusts were moving snow. Clouds were visible and moving fast above Bridger Bowl and Ross peak. Ross Pass was visibly wind scoured. 
 

I didn’t observe any natural avalanches in the steep terrain along the ridge between ski area northern boundary and Ross peak, but did notice some ski tracks (I believe in the “Trident, Dog Leg chute”). 

Region
Bridger Range
Location (from list)
Brackett Creek
Observer Name
Remo Cocco

Touring in Bradley's Meadow

Date
Activity
Skiing

Observed one avalanche in the steep chutes just outside the N Bridger Bowl boundary, SS-R2-D1-AS

HS between 150 and 200 cm. 90-120 cm of storm snow over firm mid Dec layers over facets. 15cm from the last few days. Some wind transport at mid elevations with lots of W wind up at ridgetop throughout the day. Much windier than expected in Bradley Meadow with moderate winds swirling from N and W. Sky was BKN and, no new snow. Temps around 10F.

 

 

Region
Bridger Range
Location (from list)
Bradley Meadow
Observer Name
MSU Avalanche Instructor Team

Great Visibility and Riding in the Taylor Fork

Date
Activity
Snowmobiling

We rode into the Taylor Fork today to check out conditions after the new snow from the last two weeks. We traveled up to the weather station above Sunlight Basin, along Sage Basin to the the Beaver Slide, and through Carrot Basin to the wilderness boundary. 

No cracking or collapsing was noted today. We did note two small avalanches along the Carrot Basin headwall from sometime in the last two days that broke on weak snow near the ground. These areas looked to have a shallower snowpack. Besides old crowns previously reported, and these two slides, we did not see any new avalanches in the area. 

Near Sunlight Basin, we performed a snowpit test on an east aspect at 9480' (HS 98). It propagated (ECTP11) on weak, faceted snow near the ground. Our second pit, at the wilderness boundary, was on a south aspect at 8840' (HS 122). It propagated on weak snow below a melt-freeze crust near the ground (ECTP24). 

With blue skies, sunshine, and a lack of cracking and collapsing, it was easy to be lulled into a false sense of confidence about our snowpack. But with a loading event ending only yesterday and our unstable test results, we chose to reign in our enthusiasm, follow a conservative travel plan, and stick to riding lower-angle powder. 

 

Region
Southern Madison
Location (from list)
Taylor Fork
Observer Name
H. Darby

Mt. Ellis

Date
Activity
Skiing

No signs on instability on Mt. Ellis.  Skinned to the top and descended in the trees to the north of the burn.  Ellis does not seem to have the troubling snow structure found in much of the advisory area.

Region
Northern Gallatin
Location (from list)
Mt Ellis