Northern Gallatin

Ice climbers triggered small avalanches in E. Fork Hyalite

Hyalite - East Fork
Northern Gallatin
Code
SS-AFu-R1-D1-S
Elevation
7600
Aspect
NE
Latitude
45.45390
Longitude
-110.92100
Notes

The slide was on the ice climb in Comet Alley.

From email (12/5/21) : "Small avalanche triggered while approaching ice climb in East fork of Hyalite basin. 

Another D1 natural avalanche was observed later in the day similar aspect/elevation

NE @7600’
SS-AFu-D0.5-I"

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Foot penetration
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Slab Thickness
6.0 inches
Images
Ice Climbing Avalanche
Small Avalanche In Hyalite
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
21-22

From email (12/5/21) : "Small avalanche triggered while approaching ice climb in East fork of Hyalite basin. 

Another D1 natural avalanche was observed later in the day similar aspect/elevation

NE @7600’
SS-AFu-D0.5-I"

Photo: A. Schoening

Avalanche Details: Ice climbers triggered small avalanches in E. Fork Hyalite
Forecast link: GNFAC Avalanche Forecast for Mon Dec 6, 2021
Northern Gallatin, 2021-12-06
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    • Hyalite Peak Area

    Date
    Activity
    Skiing

    While on a tour today up hyalite to check out snow conditions, we didn’t see too much recent activity. Old rollers were observed on south faces but we’re almost covered up due to the wind from the past day. I noticed a small wind slab that pulled off a peak west of Divide, head of swan creek. We found 120cm snowpack below Hyalite Peak saddle (9700ft) with two problematic layers. We got an ECTP28 at 40cm due to a ugly layer of sugary facets. We also got a ECTP25 at 80cm which was a wind slab that formed over the past week.

    Region
    Northern Gallatin
    Location (from list)
    Hyalite Peak
    Observer Name
    Tommy S

    Shooting Cracks Mt Blackmore

    Mt Blackmore
    Northern Gallatin
    Code
    Elevation
    9700
    Aspect
    SE
    Latitude
    45.26480
    Longitude
    -111.00000
    Notes

    Skiers on Mount Blackmore observed cracking within the freshly wind-loaded snow on a southeast-facing slope just below the ridge

    Number of slides
    0
    Number caught
    0
    Number buried
    0
    Problem Type
    Wind-Drifted Snow
    Images
    Shooting Cracks Mt Blackmore
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Red Flag
    Advisory Year
    21-22
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