23-24

Still Dangerous

Date
Activity
Skiing

Wind was calm and there was no new snow overnight. A small whumpf in the skin track was followed by a massive one a few minutes later. I can count on one hand the number of times I got whumpfs in a skin track...rare indeed. The second one was so big it had us both deeply concerned. We peeled off the skin track after deciding to not cross a gully and soon found debris from a sizeable avalanche that released a couple days ago about 500' above us. We dug in the flank and had 100 cm of snow, 60 cm new from last week. The snowfall during the Avalanche Warning, doubled the depth and more than doubled the snow water equivalent of the snowpack. It was a large load and avalanches are breaking underneath the new snow.

Karl was using his 100 cm long Norwegian Battle Saw (pic)...a bit overkill.

Region
Lionhead Range
Location (from list)
Hebgen Lake
Observer Name
Doug Chabot

Natural avalanche on the lawnmower

Lawn Mower - Town Hill
Out of Advisory Area
Code
SS-N-R3-O
Elevation
8200
Aspect
NW
Latitude
45.50570
Longitude
-110.49600
Notes

From IG message: “It looks like the lawn mower up north deep creek slide full path. Looking through Bino’s from the valley it looked fairly fresh. Multiple fracture lines up at the starting point. I assume it went naturally”

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
3
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From IG message: “It looks like the lawn mower up north deep creek slide full path. Looking through Bino’s from the valley it looked fairly fresh. Multiple fracture lines up at the starting point. I assume it went naturally” Photo: B. Decampli

Out of Advisory Area, 2024-02-11

Natural avalanche on the lawnmower

Date

From IG message: “It looks like the lawn mower up north deep creek slide full path. Looking through Bino’s from the valley it looked fairly fresh. Multiple fracture lines up at the starting point. I assume it went naturally”

Region
Out of Advisory Area
Location (from list)
Lawn Mower - Town Hill
Observer Name
Brock Decampli

Rider triggered Avalanche Crown Butte

Crown Butte
Cooke City
Code
SS-AMu-R2-D2-O
Elevation
9700
Aspect
N
Latitude
45.05250
Longitude
-109.96200
Notes

A snowmobiler triggered an avalanche as she climbed up the backside of Crown Butte. As she descended the slope the avalanche broke and ran down the slope behind her. Thankfully, no one was caught or injured.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft 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
24.0 inches
Vertical Fall
200ft
Slab Width
150.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year