19-20

Collapses and Whumphs west side Bridgers

Truman Gulch
Bridger Range
Code
Aspect
W
Latitude
45.85350
Longitude
-110.97000
Notes

From obs: "Took a tour down the ridge dividing Truman and Jones creek Sunday.Snow varied from 12 inches of facets topped with a crust to big solid wind deposits sitting on basal facets to 2 feet of fist and 4 finger snow over a 1 finger crust over more facets. Quite a bit of cracking and whoomphing on westerly and wnw aspects. I avoided the large paths altogether and stayed on the ridge."

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

Snowmobile triggered near Reas Peak

Reas Peak
Island Park
Code
HS-AMu-R4-D2.5-O
Latitude
44.54770
Longitude
-111.48600
Notes

Snowmobiler triggered avalanche near Reas Peak on Sunday, 1/19/20. he was able to ride through it uphill.

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
4
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
48.0 inches
Vertical Fall
100ft
Slab Width
200.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Snowmobile triggered on Cedar

Cedar Mtn.
Northern Madison
Code
HS-R3-D2.5-O
Elevation
10000
Aspect
NE
Latitude
45.22630
Longitude
-111.49600
Notes

I was on the west side of Pioneer Mtn digging a pit for YC Ski Patrol. I heard a few groups of snowmobiles cruising around the foothills of cedar. I turned and saw two snowmobilers cresting the ridge above the slide pictured as the debris was settling down. The sledders enjoyed the view for a few minutes before turning back the way they came and stumbled upon the slide they had unknowingly triggered. They skirted around the side of the crown and stopped for a few minutes. Based on the height of the rider off his sled, I would estimate the crown to be roughly 10’ at its max height. NE aspect below Cedar

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
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
60.0 inches
Vertical Fall
300ft
Slab Width
500.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From obs: "I was on the west side of Pioneer Mtn digging a pit for YC Ski Patrol. I heard a few groups of snowmobiles cruising around the foothills of cedar. I turned and saw two snowmobilers cresting the ridge above the slide pictured as the debris was settling down. The sledders enjoyed the view for a few minutes before turning back the way they came and stumbled upon the slide they had unknowingly triggered. They skirted around the side of the crown and stopped for a few minutes.

Northern Madison, 2020-01-20

Natural near Cooke

Wolverine Peak
Cooke City
Code
N-R2-D2-O
Elevation
9700
Aspect
SE
Latitude
45.05300
Longitude
-110.01000
Notes

"A south and southeast aspect of Mt. Wolverine around 9,500'-10,000'.  I'd estimate the lower crown to be about 3' deep.  And timing of the event maybe around Jan. 16.?" Photo: B. Fredlund

Number of slides
1
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Collapsing at Taylor Fork

Taylor Fork
Southern Madison
Code
Latitude
45.06070
Longitude
-111.27200
Notes

Skied a lap at 44.96854,-111.272761. Two big collapses on the skin back up, and frequent shooting cracks. We were very glad to be skiing low angles.

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

Skier triggered north of Bridger

Texas Meadow
Bridger Range
Code
HS-ASu-R2-D2-O
Elevation
8000
Aspect
SE
Latitude
45.84060
Longitude
-110.93300
Notes

A skier was skinning uphill, breaking trail and triggered this avalanche on 1/19/20. They reported, " released a small pocket near texas meadow. Maybe 50 ft wide, 2 ft crown and ran 150 ft....I was not caught and nobody was buried or injured. I was skinning up at about 1130...I got to where it was steeper and as I reached thinner snow near rocks I felt a whump. I took one more step and the pocket released."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
24.0 inches
Vertical Fall
150ft
Slab Width
50.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year