23-24

Natural avalanches on Cedar

Cedar Mtn.
Northern Madison
Code
Aspect
N
Latitude
45.22680
Longitude
-111.51200
Notes

From BSSP 1/20/24: "There were large avalanches observed on Cedar Mountain, on northerly aspects. Slides appeared to
be running on basal instabilities deep in the pack."

Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Natural avalanches on Cedar

Date

From BSSP 1/20/24: "There were large avalanches observed on Cedar Mountain, on northerly aspects. Slides appeared to
be running on basal instabilities deep in the pack."

Region
Northern Madison
Location (from list)
Cedar Mtn.
Observer Name
BSSP

Instability in Beehive

Date
Activity
Skiing

Skied beehive basin and dropped into bear basin early this morning before the warm up, about 1-2" of fresh. In a early morning pit on the bear basin side near the top of the ridge we didn't get propagation but got cracking on hit 5 of our ECT. Noted a slab over facets buried ~ 50 cm from the bottom, with another slab and facet combo below that to the ground. ~90 cm total depth. As it warmed up other groups reported collapsing as they came up and we also saw the aftermath of a remotely collapsed cornice.

Region
Northern Madison
Location (from list)
Beehive Basin

Weak structure, lots of whoomphing when breaking trail.

Date
Activity
Snowboarding

I toured in beehive today around the wilderness boundary and summer trail, riding and digging a pit on the E aspect (left side)as I was skinning toward the lake. There was about 90cm where I chose to do my profile.   Got CT 2 SC Q2 shear 70 cm down. I got ectp11 at 30 cm down. Talked to a seperate group of 2 splitboarders that came up skinning behind me, they had just dug a pit probably 50 ft below me, they also got ectp11. I saw a skier triggered slide on Tyler’s hill (lookers right of prayer flags gully), as I skinned in (ss-as-d1.5-r1-u). It looked  like it propagated across about 25 ft and just pulled out on the single roll over, I didn’t get real close, and figured a picture from that distance with trees in the way might not show much. Had skin glopping going on, most aspects on my split ski out had a crust on them, but that’s lower elevation.

Region
Northern Madison
Location (from list)
Beehive Basin
Observer Name
Tom Grande

Avalanches and Collapsing, Cooke City

COOKE CITY
Cooke City
Code
R2-D1.5
Aspect
W
Latitude
45.02020
Longitude
-109.93800
Notes

From obs:

"Widespread cracking and collapsing were observed both north and south of Cooke City."

"We stepped off the skin track and remotely triggered a small slope above the creek below. Took a closer look and it failed on surface hoar/facets 35 cm down. A skier-triggered avalanche was also seen on the west side of Woody Ridge."

Number of slides
1
Number caught
0
Number buried
0
R size
2
D size
1.5
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year