Yellowstone Club Ski patrol saw this natural avalanche during a break in snowfall on 2/7/21. Photo: YCSP
Avalanche Details: Natural avalanche on Cedar Mtn.
Northern Madison, 2021-02-08
20-21
Avalanche Details: Large explosive triggered, and naturals on road cuts, at Y.C.
Forecast link: GNFAC Avalanche Forecast for Mon Feb 8, 2021
Northern Madison, 2021-02-08
Forecast link: GNFAC Avalanche Forecast for Mon Feb 8, 2021
Natural avalanche in Y-couloir west side Bridgers
Bostwick Creek
Bridger Range
Code
HS-N-R2-D2-O
Elevation
8700
Aspect
NW
Latitude
45.79760
Longitude
-110.93800
Notes
Ski patrol had brief visibility on 2/7/21 to see a large natural avalanche, believed to have ran 2/7/21, on the northwest slopes of Saddle Peak on the West Side of the Bridger Range.
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Natural avalanahce (and collapsing) Specimen Creek
Specimen Creek
Southern Madison
Code
N-R4-D2
Elevation
8500
Aspect
SW
Latitude
45.02650
Longitude
-111.04800
Notes
From obs: "GNFAC, You’re never going to believe this, but there was tons of whumphing up in Specimen Creek today! There were a few avalanche classes there digging snow pits and getting unstable test results by the sounds of it. We saw a good sized natural on a steep SW facing meadow around 8500’, probably would call it R4D2 but it was hard to get a good look through the storm."
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
4
D size
2
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Skier triggered test slope (and collapses) Beehive
Beehive Basin
Northern Madison
Code
SS-ASc-R4-D2-O
Elevation
8000
Aspect
W
Latitude
45.34070
Longitude
-111.39100
Notes
On 2/7/21 skiers in Beehive reported: "Numerous large collapses, ECTP in several pits on mid-pack facets, and triggered a test slope remotely from flat terrain. It broke in the old snow, but towards to top, maybe 10cm below the interface with the last week’s snow. Propagated over 50m, crown depth 60-100 cm. Would be solid size 2 if the slope wasn’t 20m tall."
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
4
D size
2
Bed Surface
O - Old snow
Problem Type
New Snow
Slab Thickness
30.0 inches
Vertical Fall
40ft
Slab Width
150.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
On 2/7/21 skiers in Beehive reported: "Numerous large collapses, ECTP in several pits on mid-pack facets, and triggered a test slope remotely from flat terrain. It broke in the old snow, but towards to top, maybe 10cm below the interface with the last week’s snow. Propagated over 50m, crown depth 60-100 cm. Would be solid size 2 if the slope wasn’t 20m tall." Photo: Sam H.
Avalanche Details: Skier triggered test slope (and collapses) Beehive
Forecast link: GNFAC Avalanche Forecast for Mon Feb 8, 2021
Northern Madison, 2021-02-08
Forecast link: GNFAC Avalanche Forecast for Mon Feb 8, 2021
On 2/7/21 skiers in Beehive reported: "Numerous large collapses, ECTP in several pits on mid-pack facets, and triggered a test slope remotely from flat terrain. It broke in the old snow, but towards to top, maybe 10cm below the interface with the last week’s snow. Propagated over 50m, crown depth 60-100 cm. Would be solid size 2 if the slope wasn’t 20m tall." Photo: Sam H.
Avalanche Details: Skier triggered test slope (and collapses) Beehive
Northern Madison, 2021-02-08
This 4' deep snowpit shows the new snow over the last 4 days: everything above the blue card, over 2' of snow measuring 2" of SWE. Avalanches are breaking on the very weak, sugary snow (facets and depth hoar) 1-1.5 feet above the ground. The smooth surface in the bottom left of the photo is the failure plane. Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Mon Feb 8, 2021