18-19

Lick Creek Avalanche

Lick Creek
Northern Gallatin
Code
SS-ASc-R2-D2-I
Elevation
8000
Latitude
45.51980
Longitude
-110.95000
Notes

Skiers near lick creek intentionally triggered this avalanche that failed below the recent snow. From the email: "Ski cut a wind loaded soft slab on 34 degree headwall dropping into Bozeman Cr. drainage. Slope fractured and ran short ways, 100 feet from crown to toe. Crown was 75 feet across and 20 inches deep." Photo: Kenna

Number of slides
1
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
20.0 inches
Vertical Fall
100ft
Slab Width
75.00ft
Slab Layer Grain Type
Precipitation Particles
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skiers near lick creek intentionally triggered this avalanche that failed below the recent snow. From the email: "Ski cut a wind loaded soft slab on 34 degree headwall dropping into Bozeman Cr. drainage. Slope fractured and ran short ways, 100 feet from crown to toe. Crown was 75 feet across and 20 inches deep." Photo: Kenna

Avalanche Details: Lick Creek Avalanche
Northern Gallatin, 2019-01-26

Large Deep Slab Avalanche at Big Sky

Big Sky Resort
Northern Madison
Code
HS-AEc-R4-D3.5-G
Latitude
45.27800
Longitude
-111.45000
Notes

Big Sky Ski Patrol triggered a large deep slab avalanche during control work this morning, with a crown depth up to 10 feet deep. From the e-mail: "This is generally one of our most heavily wind loaded areas on the mountain with any wind with a westerly component.   It ran on a combo of ground and an ice crust that was sitting in a recessed area, probably leftover October snow.  Crown depth ranged from 10’ near the cornice but quickly tapered to an average of 3-5’." -BSSP 

Number of slides
1
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Hard slab avalanche
Trigger
An explosive thrown or placed on or under the snow surface by hand
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
4
D size
3.5
Bed Surface
G - Ground
Problem Type
Persistent Weak Layer
Slab Thickness
60.0 inches
Slab Layer Grain Type
Wind packed
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

A skier unintentionally triggered a slab avalanche in the northern Bridgers. The group did not notice any avalanche activity on the snowmobile ride in to the zone. They dug a pit and found poor snow structure and propagation in the new snow layer in stability tests. From the email: "About halfway up my hike I heard a wumpf and started getting carried down. I was carried about 90 yards, I got fully buried for the middle 30 yards but finally surfaced and came to a stop. My two friends were on their sleds over to the side of the face and had eyes on my the whole time.

Avalanche Details: Northern Bridgers Avalanche
Bridger Range, 2019-01-26

A skier triggered this slide around two o'clock in Bradley's Meadow on 1/26. From e-mail: "The snow propagated when I made my first turn on a convex roll above the slope skiers right of the main meadow, just before the flat area before going up The Ramp. The slab broke right under my feet and propagated 20-25 feet on either side of me. The crown was 7" deep where I triggered it but some spots of it were as deep as 13". My friends and I decided that the slide was R3 and D1-D2. Luckily I was able to ski out of the slide right when it propagated so no one was caught in it."

Bridger Range, 2019-01-26

Crown and upper part of path of avalanche that was triggered by a group of four skiers. Two were partially buried (1 injured, 1 killed) on 1/25/19. They were all ascending and near the top of the path when the avalanche broke. The top two skiers held onto trees as the avalanche pushed by them. Photo: GNFAC

Out of Advisory Area, 2019-01-26

Crown of avalanche that was triggered by a group of four skiers. Two were partially buried (1 injured, 1 killed) on 1/25/19. They were all ascending and near the top of the path when the avalanche broke. The top two skiers held onto trees as the avalanche pushed by them. Photo: GNFAC

Out of Advisory Area, 2019-01-26