23-24

From obs: "Spotted this big guy on the east face of Blackmore today. Seemingly natural and I believe it occurred in the last 36 hours or so. Debris had last nights snow on it. I’d estimate it at D2." Photo: E. Heiman

Northern Gallatin, 2024-03-29

From obs: "Spotted this big guy on the east face of Blackmore today. Seemingly natural and I believe it occurred in the last 36 hours or so. Debris had last nights snow on it. I’d estimate it at D2. " Photo E. Heiman

Northern Gallatin, 2024-03-29

Hyalite Peak Slide

Hyalite Peak
Northern Gallatin
Code
SS-N-R1-D1-I
Elevation
10200
Aspect
N
Latitude
45.38100
Longitude
-110.96100
Notes

From obs: "Spotted two fresh natural slides, one within Divide cirque on a NE aspect @ ~9,800 (D1, R1), and another on the N face of Hyalite @ ~10,200ft. that was mostly out of view, but could be estimated around similar size and destructiveness. These seem to have occurred within the last 24 hours, or after snowfall, likely windslabs on lee slopes." 

 

Number of slides
1
Number caught
0
Number buried
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
Wind-Drifted Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Divide Cirque Slide

Divide Cirque
Northern Gallatin
Code
SS-N-R1-D1-I
Elevation
9800
Aspect
NE
Latitude
45.40260
Longitude
-110.97500
Notes

From obs: "Spotted two fresh natural slides, one within Divide cirque on a NE aspect @ ~9,800 (D1, R1), and another on the N face of Hyalite @ ~10,200ft. that was mostly out of view, but could be estimated around similar size and destructiveness. These seem to have occurred within the last 24 hours, or after snowfall, likely windslabs on lee slopes."

Number of slides
1
Number caught
0
Number buried
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
Wind-Drifted Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Divide Cirque Obvs

Date
Activity
Skiing

Skied Divide Peak this morning. Snowfall totals in the main fork were around 3", while the Shower falls area experienced 6-8". Inconsistent snow depths within divide cirque highlight heavy snow transport yesterday and overnight. Varying levels of sun crust below the most recent snow were widespread.

One hand shear on a solar ESE aspect demonstrated cohesiveness, which seemed to be due to moist snow, on a thick crust. Sheer quality created a pretty smooth bed surface.

Today's tour provided many views of undulating wind effect- cornices on west-east ridges formed on south and north sides. Plenty of large cornices were present and could be quite destructive.

Spotted two fresh natural slides, one within Divide cirque on a NE aspect @ ~9,800 (D1, R1), and another on the N face of Hyalite @ ~10,200ft. that was mostly out of view, but could be estimated around similar size and destructiveness. These seem to have occurred within the last 24 hours, or after snowfall, likely windslabs on lee slopes.

We skied east of the central divide gully, avoiding wind issues to the west and solar issues to the east.

Region
Northern Gallatin
Location (from list)
Divide Cirque
Observer Name
E. Webb

ECT below the Ramp

Date
Activity
Skiing

ECTP 11 30cm down on melt freeze layer.
PST 28/100 End

location: meadow below the ramp above Bradley’s meadow.

Region
Bridger Range
Location (from list)
Bradley Meadow
Observer Name
Zach bailey

Recent natural avalanche on Mt. Blackmore

Date
Activity
Skiing

Spotted this big guy on the east face of Blackmore today. Seemingly natural and I believe it occurred in the last 36 hours or so. Debris had last nights snow on it. I’d estimate it at D2. 

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Eric Heiman