Northern Gallatin
Warm Temperatures, Wet Snow in Hyalite
Date
Activity
Skiing
We toured in Hyalite today. By 10:30 in the morning we saw wet, natural avalanches coming down east facing cliffs. We also saw several pinwheels from yesterday. By noon we were at 9,900' on a SE facing aspect, and the snow surface was wet at this altitude. Once we were down at 9,000' the top 8" of snow was wet, and it was beginning to move as a slab on small rollovers.
Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Dave Zinn, Alex Haddad
Snowmobile triggered wind slab Storm Castle
Storm Castle
Northern Gallatin
Code
AMu-R2-D1.5-I
Aspect
E
Latitude
45.44690
Longitude
-111.07600
Notes
From obs 4/7/23: "Small wind slab triggered by snowmobile. Slope was assessed by group as wind blown before climb. No one was caught. East facing slope, Storm castle Ridge. Photo one shows trigger point where the Snowmobiler carved hard and set off the slab deeper in the snowpack"
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
12.0 inches
Vertical Fall
100ft
Slab Width
75.00ft
Images
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
From obs 4/7/23: "Small wind slab triggered by snowmobile. Slope was assessed by group as wind blown before climb. No one was caught. East facing slope, Storm castle Ridge. Photo one shows trigger point where the Snowmobiler carved hard and set off the slab deeper in the snowpack"
Avalanche Details: Snowmobile triggered wind slab Storm Castle
Forecast link: GNFAC Avalanche Forecast for Sat Apr 8, 2023
Northern Gallatin, 2023-04-07
Forecast link: GNFAC Avalanche Forecast for Sat Apr 8, 2023
From obs 4/7/23: "Small wind slab triggered by snowmobile. Slope was assessed by group as wind blown before climb. No one was caught. East facing slope, Storm castle Ridge. Photo one shows trigger point where the Snowmobiler carved hard and set off the slab deeper in the snowpack."
Avalanche Details: Snowmobile triggered wind slab Storm Castle
Forecast link: GNFAC Avalanche Forecast for Sun Apr 9, 2023
Northern Gallatin, 2023-04-07
Forecast link: GNFAC Avalanche Forecast for Sun Apr 9, 2023
From obs 4/7/23: "Small wind slab triggered by snowmobile. Slope was assessed by group as wind blown before climb. No one was caught. East facing slope, Storm castle Ridge. Photo one shows trigger point where the Snowmobiler carved hard and set off the slab deeper in the snowpack"
Avalanche Details: Snowmobile triggered wind slab Storm Castle
Northern Gallatin, 2023-04-07
Snowmobile triggered wind slab
Date
Activity
Snowmobiling
Small wind slab triggered by snowmobile. Slope was assessed by group as wind blown before climb. No one was caught. East facing slope, Storm castle Ridge.
Photo one shows trigger point where the Snowmobiler carved hard and set off the slab deeper in the snowpack
Region
Northern Gallatin
Location (from list)
Storm Castle
Observer Name
Ryli Schlueter
Remotely trigged small slide in Portal Creek
Portal Creek
Northern Gallatin
Code
AMr-R1-D1
Latitude
45.28900
Longitude
-111.14100
Notes
We were snowmobiling up portal creek today near the hidden lakes trailhead and I set off a small slide remotely by riding below a small ridge. The slide was about 3 feet at its crown 30 or 40 feet wide and ran about 40 yards. It just came down to where my track had crossed underneath. Everything was fine and we stayed safe and continued on with our plan and had a nice day.
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
1
D size
1
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year