24-25
Small slide in Lionhead
Lionhead Ridge
Lionhead Range
Code
AMu-R1-D1
Latitude
44.71450
Longitude
-111.31800
Notes
From FB message: "Small slide in lower elevation back by lionshead"
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
From FB message: "Small slide in lower elevation back by lionshead"
Avalanche Details: Small slide in Lionhead
Forecast link: GNFAC Avalanche Forecast for Fri Feb 14, 2025GNFAC Avalanche Forecast for Sat Feb 15, 2025
Lionhead Range, 2025-02-14
Forecast link: GNFAC Avalanche Forecast for Fri Feb 14, 2025GNFAC Avalanche Forecast for Sat Feb 15, 2025
Small slide in lower elevation
Date
Activity
Snowmobiling
From FB message: "Small slide in lower elevation back by lionshead"
Region
Lionhead Range
Location (from list)
Lionhead Ridge
Small Wind Slab Taylor Fork
Sunlight Basin
Southern Madison
Code
SS-N-R1-D1
Elevation
9150
Aspect
E
Latitude
44.97310
Longitude
-111.31000
Notes
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1
Problem Type
Wind Slab
Slab Thickness
15.0 centimeters
Vertical Fall
50ft
Slab Width
50.00ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Persistent Slab Avalanches in Taylor Fork
Taylor Fork
Southern Madison
Code
SS-AM-R2-D2-O
Elevation
9200
Aspect Range
E-N
Latitude
45.06070
Longitude
-111.27200
Notes
We rode into the Taylor Fork, down into the bottom of Sunlight Basin, across Carrot Basin and to the Wilderness Boundary. We saw four persistent slab avalanches that likely broke last weekend or at the beginning of the week. All appeared to be snowmobiler-triggered R1-2, D1.5-2 avalanches at broke of the January layer of near-surface facets and surface hoar. Additionally, we saw one wind slab avalanche (R1, D1) in Sunlight Basin. This slide was fresh from this morning or yesterday.
We dug a crown profile for the persistent slab avalanche in Sunlight (attached). ECTN24 on the SH layer buried 50 cm (20") deep.
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Slab
Slab Thickness
50.0 centimeters
Vertical Fall
100ft
Slab Width
200.00ft
Weak Layer Grain type
Surface Hoar
Weak Layer grain size
8.00mm
Images
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
Avalanche Details: Persistent Slab Avalanches in Taylor Fork
Southern Madison, 2025-02-13
Buried layers of surface hoar often show up a stripe in a snowpit wall (other things such a thin melt-freeze crust can look similar but feel much differently). A snowmobiler-triggered avalanche in Sunlight Basin broke on this weak layer of feathery surface hoar. Photo: GNFAC
Avalanche Details: Persistent Slab Avalanches in Taylor Fork
Southern Madison, 2025-02-13
Relatively small persistent slab avalanche in Carrot Basin in the Taylor Fork. Photo: GNFAC
Avalanche Details: Persistent Slab Avalanches in Taylor Fork
Forecast link: GNFAC Avalanche Forecast for Fri Feb 14, 2025
Southern Madison, 2025-02-13
Forecast link: GNFAC Avalanche Forecast for Fri Feb 14, 2025
We rode into the Taylor Fork on Feb 13, We saw four persistent slab avalanches that likely broke last weekend or at the beginning of the week. All appeared to be snowmobiler-triggered R1-2, D1.5-2 avalanches at broke of the January layer of near-surface facets and surface hoar. Photo: GNFAC
Avalanche Details: Persistent Slab Avalanches in Taylor Fork
Southern Madison, 2025-02-13