24-25

New snow avalanche in Hyalite east fork

Date
Activity
Ice Climbing

from @brendan_durrum_photo

Region
Northern Gallatin
Location (from list)
Hyalite - East Fork
Observer Name
Brendan Durrum

Slide South of Henderson Bench

Henderson Mountain
Cooke City
Code
SS-ASr-R3-D2-I
Elevation
8900
Latitude
45.04330
Longitude
-109.91800
Notes

Sunday morning 12/15 we were skiing just Southwest of Henderson Mountain between the road cuts. The first skier in our party remotely triggered this slide from a slightly lower angle aspect about 50 ft to the skiers left of the slide where the snowpack was shallower. It broke on a convex rollover about 100 ft wide and ran about 80 ft. downslope. The crown averaged 30 inches and broke on sugary facets about 18 inches from the ground. No one was caught.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
3
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Persistent Weak Layer
Slab Thickness
30.0 inches
Vertical Fall
80ft
Slab Width
100.00ft
Weak Layer Grain type
Solid faceted particles
Images
Slide South of Henderson Bench 2
Slide South of Henderson Bench 1
Snow Observation Source
Slide South of Henderson Bench
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
24-25

Large Whumph at Blackmore

Mt Blackmore
Northern Gallatin
Code
Latitude
45.44440
Longitude
-111.00400
Notes

I observed a large whoomph about 150ft from the ridge (top of glades) going up Blackmore today while breaking trail. was definitely wind loaded area… I could feel the energy in the snowpack today once I got up higher, super sensitive it seems. ECTN 14 in my pit I dug lower down the meadow with no wind slab prevalent.

Number of slides
0
Number caught
0
Number buried
0
Snow Observation Source
Large Whumph at Blackmore
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
24-25

Skier triggered slide at The Throne

Date
Activity
Skiing

From IG: "Storm slab broke about 200’ above us as skinning up the hallway coming from the north side on the throne." 

Region
Bridger Range
Location (from list)
The Throne

Large Whumph at Blackmore

Date
Activity
Skiing

I observed a large whoomph about 150ft from the ridge (top of glades) going up Blackmore today while breaking trail. was definitely wind loaded area… I could feel the energy in the snowpack today once I got up higher, super sensitive it seems. ECTN 14 in my pit I dug lower down the meadow with no wind slab prevalent.

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
B. Neiberger

Slide South of Henderson Bench

Date
Activity
Skiing

Sunday morning 12/15 we were skiing just Southwest of Henderson Mountain between the road cuts. The first skier in our party remotely triggered this slide from a slightly lower angle aspect about 50 ft to the skiers left of the slide where the snowpack was shallower. It broke on a convex rollover about 100 ft wide and ran about 80 ft. downslope. The crown averaged 30 inches and broke on sugary facets about 18 inches from the ground. No one was caught.

Region
Cooke City
Location (from list)
Henderson Mountain
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