19-20

Snowmobile Triggered Avalanche McAtee Basin

McAtee Basin
Northern Madison
Code
HS-AMu-R2-D2-O
Latitude
45.17710
Longitude
-111.43500
Notes

From Instagram: "I watched a snowmobiler set this avalanche off today. Very scary in MT right now."

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
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
48.0 inches
Vertical Fall
100ft
Slab Width
100.00ft
Images
Snowmobiler triggered avalanche in McAtee Basin_close
Snowmobiler triggered slide in MacAtee Basin_far
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Snowmobile Triggered Avalanche Lionhead

Lionhead Ridge
Lionhead Range
Code
HS-AM-R2-D2-G
Elevation
8800
Aspect
N
Latitude
44.73360
Longitude
-111.32900
Notes

From email: "I wanted to make you aware of a snowmobile triggered slide in Lionhead today. Fortunately, I was not injured, was able to stay completely on top, climbed through the majority of the snow wash after seeing it begin to break, and relatively slowly slid down with the last of the moving snow while still on the machine. When I came to a stop I stood up and was completely free of the snow. Our group is trained in avalanche safety, practiced beacon use prior to leaving town in the morning, were wearing avy gear, and were very fortunate that this ended the way it did.  

A clear reminder that this can happen to any of us and to be careful out there."

Number of slides
1
Number caught
1
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
R size
2
D size
2
Bed Surface
G - Ground
Problem Type
Persistent Weak Layer
Slab Thickness
48.0 inches
Vertical Fall
300ft
Slab Width
100.00ft
Images
Snowmobiler triggered slide at Lionhead
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Natural Avalanche Wolverine Peak

Wolverine Peak
Cooke City
Code
HS-N-R3-D2.5-O
Elevation
10000
Aspect
SW
Latitude
45.05300
Longitude
-110.01000
Notes

A large natural avalanche observed on the southwest face of Wolverine Peak. Observed 1/20/2020. Photo: D. Wycoff

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
3
D size
2.5
Bed Surface
O - Old snow
Images
SW Face of Wolverine Peak Avalanche
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Natural Avalanche Meridian Peak

Meridian Peak
Cooke City
Code
HS-NO-R3-D2.5-O
Elevation
9800
Aspect
NW
Latitude
45.02700
Longitude
-110.00300
Notes

A large natural avalanche observed on the northwest face of Median Peak on 1/20/2020. Photo: D. Wycoff

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Unclassified natural trigger
R size
3
D size
2.5
Bed Surface
O - Old snow
Images
NW Face Meridian Peak Avalanche
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20

Natural Deep Slab Avalanche Hayden Headwall

Hayden Creek
Cooke City
Code
HS-N-R3-D2.5-O
Elevation
10200
Aspect
N
Latitude
44.99520
Longitude
-109.90800
Notes

Spotted the crown on our way down from Ripcurl yesterday, we got a closer look today when we toured into High Hayden. N aspect 10200' 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
3
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Images
Hayden Headwall Deep Slab 2
Hayden Headwall Deep Slab 1
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
19-20
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