22-23

Natural Avalanches Tepee Basin

Date
Activity
Snowmobiling

Via IG: “Large natural avalanche on the east side of redstreak peak down near West Yellowstone. 

And then another natural one right on the shoulder of white peak on the boundary.”

 

Region
Southern Madison
Location (from list)
Tepee Basin
Observer Name
Scott Mooney

Electric Peak Avalanches

Date

Via IG: “Electric peak via Betty gulch avalanches. Assuming they are natural!”

Region
Southern Gallatin
Location (from list)
Electric Peak
Observer Name
Riley Rose

Dudley Creek

Date
Activity
Skiing

On Saturday we toured up Dudley Creek. At around 1pm we ski cut an isolated, wind loaded pocket on a SE aspect at approximately 9200ft elevation and released a wind slab (see photo). The slab was about 20 feet wide, about 1 foot at it's deepest, and ran for about 200 feet. Staying wary of wind loading, we dug a pit on a NE aspect, in a spot without evidence of significant wind loading, and received an ECTNX. Although we did not identify any failure on buried weak layers in this location, it will remain something to watch for with more snow and warmer temps on the way. 

Region
Northern Madison
Location (from list)
Dudley Creek
Observer Name
Erich Schreier

Natural small deep slab on Sheep

COOKE CITY
Cooke City
Code
HS-N-R2-D2-O
Elevation
10500
Aspect
E
Latitude
45.02020
Longitude
-109.93800
Notes

Today we rode north of Cooke City and looked at recent natural and Human-triggered avalanches...

We saw two slides that had not been reported previously. One natural on the east side of Sheep Mtn. that was a hard slab of wind-drifted snow on a heavily wind loaded slope near the high ridgeline at 10,500'.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
30.0 inches
Vertical Fall
1000ft
Slab Width
150.00ft
Images
Natural deep slab on Sheep Mtn.
Snow Observation Source
Large recent avalanches near Cooke City
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

Snowmobile triggered, Marty's, Cooke

COOKE CITY
Cooke City
Code
HS-AMu-R3-D2.5-O
Elevation
9400
Aspect
SW
Latitude
45.02020
Longitude
-109.93800
Notes

Snowmobile triggered on a path called "Marty's" above Daisy Pass road. This was similar aspect as the slide on Crown Butte yesterday, and likely had a similar snowpack structure. We checked the debris for a beacon signal to be sure no one was caught, and did not find one. This may have been triggered today (3/12). Photo: GNFAC

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
3
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
30.0 inches
Vertical Fall
300ft
Slab Width
200.00ft
Images
Snowmobile triggered on Marty's debris 2
Snowmobile triggered on Marty's debris
Snowmobile triggered on Marty's crown
Snow Observation Source
Large recent avalanches near Cooke City
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23
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