Northern Gallatin

Widespread cracking and collapsing

Multiple locations
Bridger Range
Code
Latitude
45.67910
Longitude
-111.04200
Notes

Cracking and collapsing reported across the advisory area in the Bridger Range, Big Sky area, near West Yellowstone and Island Park, and near Cooke City.

Number of slides
0
Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year

Natural Avalanches in Hyalite

Hyalite - main fork
Northern Gallatin
Code
SS-N-R1-D1-S
Latitude
45.44720
Longitude
-110.96200
Notes

Upon descending climbers saw two recent natural avalanches in the Dribbles Gully. These avalanches were failing within the new snow. 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Slab Thickness
15.0 centimeters
Vertical Fall
150ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Climb Above Dribbles Gully

Date

Well I had to go see what the snow was doing today. We climbed the Fallen (about 100m below Climb Above Dribbles). On ascent there were no signs of instability (no cracking, collapsing, naturals, good results in hand pits, etc). New snow had accumulated to around 1m in spots however! No activity in the old snow, which seemingly gained some strength in the warm weather midweek (hardness in FCs went from fist to 4F from mon-fri). 
 

During the day, snowfall rates hit S2 at times, and accumulation was around 5 cm, with moderate winds and moderate drifting. On descent this new snow was touchy, and we observed 2 natural avalanches, max depth 15 cm, on the small end of size 1, F hardness, running less than 30-50m exclusively in new snow. (SS-N-R1D1-N)

Structure remains poor overall.

Region
Northern Gallatin
Location (from list)
Hyalite - main fork

The Gullies Are Dangerous

Date
Activity
Ice Climbing

8" of snow fell in 3 hours this morning. We inspected the snowpack in the gully above Silken Falls for the Bozeman Ice Festival. New snow and wind are increasing the avalanche danger. Be careful crossing gullies, especially the one above the Sceptor, the one below Responsible Family Man, Avalanche Gulch and Silken Falls. Triggering an avalanche in these is a very real possibility as they continue to get wind-loaded.

Region
Northern Gallatin
Location (from list)
Hyalite - main fork
Observer Name
Doug Chabot