Northern Gallatin
Ice climber triggered and caught in avalanche in Upper Mill Creek, Absarokas
Out of Advisory Area
Code
HS-AFu-R3-D2-I
Elevation
9000
Aspect
NW
Latitude
45.27760
Longitude
-110.50300
Notes
Outside advisory area, but seemed relevant to report a climber triggered avalanche today (12/11/2019) at around 9000 ft, on a 35 degree slope on a NW aspect. Solid size 2, triggered roughly 15m below the crown (depth 20-40 cm, width 15m) Failed on a density change below a fresh windslab, ran around 100m and deposited 1m of debris towards the bottom of the runout. HS-AF-D2/R3-I. No injuries.
Number caught
1
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Foot penetration
Trigger Modifier
u-An unintentional release
R size
3
D size
2
Bed Surface
I - Interface between new and old snow
Slab Thickness
30.0 centimeters
Vertical Fall
300ft
Slab Width
15.00ft
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
These feathery surface hoar crystals were buried under 5" of snow last night up Hyalite. These weak grains may become a problem with additional load. Phoro: B. VandenBos
Forecast link: GNFAC Avalanche Forecast for Thu Nov 14, 2019
Wind Slab avalanche on Mt. Blackmore
Mt Blackmore
Northern Gallatin
Code
Latitude
45.44440
Longitude
-111.00400
Notes
Natural wind slab avalanche on the N face of Mount Blackmore on 11/10/2019.
From email: "Noted recent activity on the N face which likely happened yesterday during the storm; upper half of the avalanche and crown had been scoured by wind, but the toe of the debris was still visible and had traveled quite far"
Number caught
0
Number buried
0
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
"Lots of cracking up there this morning on fresh, mid elevation wind slabs"
Photo: B. Nobel
Avalanche Details: Cracking Wind Slabs at Bridger
Forecast link: GNFAC Avalanche Forecast for Tue Nov 12, 2019
Bridger Range, 2019-11-11
Forecast link: GNFAC Avalanche Forecast for Tue Nov 12, 2019
"While skinning up to the top of Powder Park lift at Bridger, we had roughly 15' cracks propagate on an E/SE aspect. A snowpit showed roughly 8" of wind slab above a few inches of facets, on top of last week's rain crust." November 11, 2019.
Photo: G. Lawrence
Avalanche Details: Cracking Wind Slabs at Bridger
Forecast link: GNFAC Avalanche Forecast for Tue Nov 12, 2019GNFAC Avalanche Forecast for Thu Nov 14, 2019
Bridger Range, 2019-11-11
Forecast link: GNFAC Avalanche Forecast for Tue Nov 12, 2019GNFAC Avalanche Forecast for Thu Nov 14, 2019
On November 8th, skiers found weak facets and surface hoar had formed during prior cold and dry weather. Keep an eye out for these weak layers if they get buried. Photo: B. VandenBos
On November 8th, skiers found weak facets and surface hoar had formed during prior cold and dry weather. Keep an eye out for these weak layers if they get buried. Photo: B. VandenBos
Wet loose at Bridger
Bridger Bowl
Bridger Range
Code
WL-N-R1-D1
Latitude
45.81560
Longitude
-110.92300
Notes
Several small wet loose avalanches were observed at Bridger Bowl on 11/5.
Number caught
0
Number buried
0
Avalanche Type
Wet loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year