Southern Gallatin

Skier triggered wind slab, S. Gallatin

SOUTHERN GALLATIN RANGE
Southern Gallatin
Code
SS-ASc-R2-D1-I
Latitude
45.04320
Longitude
-110.96200
Notes

Triggered wind slab in southern Gallatins

Number of slides
1
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
2
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
8.0 inches
Vertical Fall
50ft
Slab Width
20.00ft
Attached Videos
Skier triggered wind slab, S. Gallatin
Snow Observation Source
Triggered wind slab
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

Triggered wind slab

Date
Activity
Skiing

Triggered wind slab in southern Gallatins

Region
Southern Gallatin
Location (from list)
SOUTHERN GALLATIN RANGE
Observer Name
Alec Fletcher

Large natural wind slab avalanche Mt. Blackmore

Mt Blackmore
Northern Gallatin
Code
HS-N-R2-D2-I
Elevation
9500
Aspect
E
Latitude
45.44440
Longitude
-111.00400
Notes

From IG: Skiers near Mt. Blackmore on 2/24 saw a large avalanche on the east side of Mt. Blackmore that appeared to have happened in the last 24 hours.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
24.0 inches
Vertical Fall
700ft
Slab Width
100.00ft
Images
Large natural wind slab Mt. Blackmore
Snow Observation Source
Large natural wind slab avalanche Mt. Blackmore
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

Natural Cornice Collapse in Beehive

Beehive Basin
Northern Madison
Code
C-N-R3-D2
Elevation
9300
Aspect
E
Latitude
45.32990
Longitude
-111.38200
Notes

Came across this very large cornice that appeared to have broken naturally sometime in the past 24 hours. Saw a few others that had broken recently throughout our tour, but none as large as this.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Cornice fall
Trigger
Natural trigger
R size
3
D size
2
Problem Type
Cornice Fall
Images
Natural Cornice Collapse in Beehive
Snow Observation Source
Natural Cornice Collapse in Beehive Basin
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
22-23

From email 2/24/23: "Came across this very large cornice that appeared to have broken naturally sometime in the past 24 hours. Saw a few others that had broken recently throughout our tour, but none as large as this." E. Heiman

Avalanche Details: Natural Cornice Collapse in Beehive
Forecast link: GNFAC Avalanche Forecast for Sat Feb 25, 2023GNFAC Avalanche Forecast for Sun Feb 26, 2023
Northern Madison, 2023-02-25
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    • Rider triggered wind slab Buck Ridge

    Buck Ridge
    Northern Madison
    Code
    SS-AM-R3-D1.5-I
    Elevation
    9500
    Aspect
    NE
    Latitude
    45.17190
    Longitude
    -111.38000
    Notes

    Triggered a small 2’ deep wind slab in new snow this afternoon.  NNE aspect 9,500’, approximately 38° slope.  Riding was excellent on all high North facing slopes and this was the only sign of instability we saw all day.  Wind was howling on the way out, lots of snow coming out of the trees and transporting at ridge tops.

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    Trigger
    Snowmobile
    R size
    3
    D size
    1.5
    Bed Surface
    I - Interface between new and old snow
    Problem Type
    Wind-Drifted Snow
    Slab Thickness
    24.0 inches
    Vertical Fall
    75ft
    Slab Width
    50.00ft
    Images
    Rider triggered wind slab Buck Ridge
    Snow Observation Source
    Rider triggered wind slab Buck Ridge
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    22-23

    From email 2/24/23: "Triggered a small 2’ deep wind slab in new snow this afternoon.  NNE aspect 9,500’, approximately 38° slope.  Riding was excellent on all high North facing slopes and this was the only sign of instability we saw all day.  Wind was howling on the way out, lots of snow coming out of the trees and transporting at ridge tops."

    Avalanche Details: Rider triggered wind slab Buck Ridge
    Forecast link: GNFAC Avalanche Forecast for Sat Feb 25, 2023GNFAC Avalanche Forecast for Sun Feb 26, 2023
    Northern Madison, 2023-02-25
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original
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