23-24
Recent instability in the new and wind drifted snow
CENTENNIAL RANGE
Island Park
Code
SS-N-R2-D2-I
Aspect Range
N-E-S
Latitude
44.54890
Longitude
-111.73100
Notes
Two rider-triggered avalanches near Reas Peak on north aspects that broke within or just below the new storm snow (D1s)
Natural avalanche broke near Yale Creek on a southern aspect that broke below new snow (D1)
Two natural avalanches that broke within the wind drifted snow in Jefferson Bowl (D2s)
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Images
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
Collapse Near the Sphinx
Sphinx Mountain
Northern Madison
Code
Latitude
45.15820
Longitude
-111.47700
Notes
From email: We were out camping around the east side of Sphinx Mountain. We rode sleds over dirt for a while and came from Buck Ridge. We didn’t see any fresh avalanche crowns all weekend. We did get a big whoomph that collapsed the snowpack while skinning along a ridgeline on Sphinx that seemed freshly loaded. Cracks shot out maybe 25 feet around, but it didn’t move. We didn’t dig snow pits; we followed our plan of keeping our terrain selection on the mellow side.
Number caught
0
Number buried
0
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
Collapse Near the Sphinx
Date
Activity
Snowboarding
From email: We were out camping around the east side of Sphinx Mountain. We rode sleds over dirt for a while and came from Buck Ridge. We didn’t see any fresh avalanche crowns all weekend. We did get a big whoomph that collapsed the snowpack while skinning along a ridgeline on Sphinx that seemed freshly loaded. Cracks shot out maybe 25 feet around, but it didn’t move. We didn’t dig snow pits; we followed our plan of keeping our terrain selection on the mellow side.
Region
Northern Madison
Location (from list)
Sphinx Mountain
Observer Name
Tom Grande
We saw a small natural avalanche below Reas Peak on a northerly aspect. Photo: GNFAC
Avalanche Details: Recent instability in the new and wind drifted snow
Island Park, 2024-04-01
We saw two avalanches below Reas Peak on North aspects that were likely triggered by snowmobilers. Photo: GNFAC
We saw two recent natural avalanches that broke below the wind-drifted snow in Jefferson Bowl. Photo: GNFAC
Avalanche Details: Recent instability in the new and wind drifted snow
Forecast link: GNFAC Avalanche Forecast for Tue Apr 2, 2024
Island Park, 2024-04-01
Forecast link: GNFAC Avalanche Forecast for Tue Apr 2, 2024
We saw two recent natural avalanches that broke below the wind-drifted snow in Jefferson Bowl. Photo: GNFAC
Avalanche Details: Recent instability in the new and wind drifted snow
Island Park, 2024-04-01
We saw a natural avalanche that broke near Yale Creek on a southern aspect that broke below the recent snow. Photo: GNFAC
Avalanche Details: Recent instability in the new and wind drifted snow
Island Park, 2024-04-01