18-19
This pit was dug in the same general area as the natural avalanche shown in part (1) of this observation. The pit shows a faceted snowpack capped by the recent storm snow. Photo: A. Pohl
Natural avalanche in the Northern Bridgers
BRIDGER RANGE
Bridger Range
Code
SS-N-R1-D1-I
Elevation
7800
Latitude
45.92170
Longitude
-110.98500
Notes
Skiers in the northern Bridgers noticed this natural slab avalanche. From an email: "Extremely weak, faceted snowpack on w-e slopes all the way up to 8000ft or so. Widespread cracking and collapsing, basically a 14in storm slab on top of total garbage. Observed a good size natural in steep, north facing terrain at about 7800ft, starting zone was a big slough fan and broke what looked like 2-3ft deep, presumably on the dry spell facets."
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Skiers in the northern Bridgers noticed this natural slab avalanche that released during the most recent storm cycle. Photo: A. Pohl
Avalanche Details: Natural avalanche in the Northern Bridgers
Bridger Range, 2018-12-31
Collapsing and cracking of the new snow in Hyalite
Maid of the Mist
Northern Gallatin
Code
SS-ARc-R1-D1-I
Latitude
45.41640
Longitude
-110.97000
Notes
Riders in Hyalite observed collapsing and propagating of the new snow near Maid of the Mist. They also found unstable test results (ECTP7).
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Snowboarder
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Layer Grain Type
Precipitation Particles
Images
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Snowboarders in Hyalite observed collapsing and cracking of the new snow near Maid of the Mist. They also found unstable test results (ECTP7). Photo: C. Grote
Avalanche Details: Collapsing and cracking of the new snow in Hyalite
Forecast link: GNFAC Avalanche Forecast for Mon Dec 31, 2018
Northern Gallatin, 2018-12-31
Forecast link: GNFAC Avalanche Forecast for Mon Dec 31, 2018
New snow Instabilites in Cooke City
Woody Ridge
Cooke City
Code
SS-AS-R1-D1-I
Latitude
44.97390
Longitude
-109.92400
Notes
This small slab was triggered by a skier and failed at the new snow interface.
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
This small slab of new snow was triggered by a skier on Woody Ridge in Cooke City. Photo: N. Stayner
Avalanche Details: New snow Instabilites in Cooke City
Forecast link: GNFAC Avalanche Forecast for Mon Dec 31, 2018
Cooke City, 2018-12-31
Forecast link: GNFAC Avalanche Forecast for Mon Dec 31, 2018
New snow avalanches in Hyalite
Mt Blackmore
Northern Gallatin
Code
SS-ASc-R1-D1-I
Latitude
45.44410
Longitude
-111.00300
Notes
Skiers near Blackmore found the new snow failing at the new/old snow interface. They were able to trigger these soft slabs with a ski pole whack.
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Layer Grain Type
Precipitation Particles
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year