20-21

Collapse and crack in Lick Creek

Lick Creek
Northern Gallatin
Code
Latitude
45.52430
Longitude
-110.95600
Notes

A skier got a collapse and crack in Lick Creek. The collapse has sizeable displacement which is indicative of a very thick and unstable weak layer.

Number of slides
0
Number caught
0
Number buried
0
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year

south facing slope off Henderson mountain. ~9,500

Date
Activity
Skiing

Remote triggered a soft slab with a ski cut. Cut across top of slope and the slide initiated ten yards below. slide was approximately 25 feet at the crown and ran the whole length/ width of the gulley. Couldn’t see past the choke of the gulley . Thicker at the crown where snow was wind drifted 16 in~. Dug a quick pit after. HS 80 cm. Slab on top of crust and facets. No one was caught and we skinned back up and skied out our original skin track.

Region
Cooke City
Location (from list)
Henderson Bench
Observer Name
Scott Brown

Natural Avalanche in Argentina Bowl

Argentina Bowl
Bridger Range
Code
HS-N
Elevation
9000
Aspect
E
Latitude
45.78690
Longitude
-110.93500
Notes

Natural avalanche that ran during or prior to storm morning of 1/5/21. An Avalanche Warning was issued that morning.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Scotch Bonnet

Date
Activity
Snowmobiling

Natural, unwitnessed avalanche

Location (from list)
COOKE CITY
Observer Name
RYAN KNATTERUD

Sheep Basin - Wolverine Peak

Date
Activity
Snowmobiling

Natural avalanche on SE wind loaded slope

Location (from list)
COOKE CITY
Observer Name
Ryan Knatterud

Yellowstone National park (Chrystal Creek)

Date
Activity
Skiing

Today in Chrystal Creek my group of 4 skiers triggered 3 cornices. 2 remotely triggered and one small one while skiing off of it. The slope below was not steep enough to slide far. ~75cm of snow where we dug our pit on a North slope at 26 degrees. One slab ~23cm off the ground didn’t cause any real problems. Another hard slab ~35cm-42cm sitting on facets broke at ECTP7, CTPV. Had more whumphs than we could count and cracks that shot 30+ meters. Snow depth varied greatly, some wind loading.

Region
Out of Advisory Area
Observer Name
Oscar Dalling

Natural avalanches along Lionhead Ridge

Lionhead Ridge
Lionhead Range
Code
SS-N
Elevation
9000
Aspect
E
Latitude
44.71450
Longitude
-111.31800
Notes

A Custer Gallatin NF Snow Ranger saw a crown line under the rock band on Lionhead Ridge.

On Jan 6, GNFAC forecaster's saw debris below the ridgeline in two paths, but didn't have enough visibility to get more info about the slides.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year