19-20

Snowmobiler triggered avalanches in Portal Ck, N. Gallatin

Portal Creek
Northern Gallatin
Code
SS-AMu-R2-D1-I
Latitude
45.28900
Longitude
-111.14100
Notes

A snowmobiler found very touchy conditions in Portal Creek. The new snow easily avalanched on road cuts so they went home.

Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Images
Snomobiler triggered slides in Portal Creek_3
Snomobiler triggered slides in Portal Creek_2
Snomobiler triggered slides in Portal Creek_1
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
19-20

Snowmobile Triggered Avalanches, McAtee Basin

McAtee Basin
Northern Madison
Code
SS-AMu-R2-D2-O
Elevation
8900
Aspect
SW
Latitude
45.17710
Longitude
-111.43500
Notes

We saw a group of six snowmobilers who said they triggered these slides in McAtee Basin on the left side of the meadow on Saturday, Feb 8. I didn't see tracks up on the hill or sidehill tracks so they may have triggered the slope from the flats below. The debris runs all the way to the bottom of the hill. 

Number of slides
3
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
36.0 inches
Vertical Fall
250ft
Slab Width
100.00ft
Images
Snowmobile Triggered Avalanche, McAtee Basin 3
Snowmobile Triggered Avalanche, McAtee Basin 2
Snowmobile Triggered Avalanche, McAtee Basin 1
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year
19-20

We saw a group of six snowmobilers who said they triggered these slides in McAtee Basin on the left side of the meadow on Saturday, Feb 8. I didn't see tracks up on the hill or sidehill tracks so they may have triggered the slope from the flats below. The debris runs all the way to bottom of the hill. Photo: K Peaslee

Avalanche Details: Snowmobile Triggered Avalanches, McAtee Basin
Northern Madison, 2020-02-08
Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • We saw a group of six snowmobilers who said they triggered these slides in McAtee Basin on the left side of the meadow on Saturday, Feb 8. I didn't see tracks up on the hill or sidehill tracks so they may have triggered the slope from the flats below. The debris runs all the way to bottom of the hill. Photo: K Peaslee

    Avalanche Details: Snowmobile Triggered Avalanches, McAtee Basin
    Northern Madison, 2020-02-08
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • We saw a group of six snowmobilers who said they triggered these slides in McAtee Basin on the left side of the meadow on Saturday, Feb 8. I didn't see tracks up on the hill or sidehill tracks so they may have triggered the slope from the flats below. The debris runs all the way to bottom of the hill. Photo: K Peaslee

    Avalanche Details: Snowmobile Triggered Avalanches, McAtee Basin
    Northern Madison, 2020-02-08
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • Natural Deep Slab Saddle Peak

    Saddle Peak
    Bridger Range
    Code
    HS-N-R3-D3.5-O
    Elevation
    8900
    Aspect
    NE
    Latitude
    45.79430
    Longitude
    -110.93600
    Notes

    A natural 4-8' deep slab avalanche broke on Saddle Peak within the last couple days (2/6 or 2/7) during the current storm. The mountains received 3-5 feet of snow equal to 3-5" of SWE over the last week with more snow in the forecast.

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Hard slab avalanche
    Trigger
    Natural trigger
    R size
    3
    D size
    3.5
    Bed Surface
    O - Old snow
    Problem Type
    Persistent Weak Layer
    Slab Thickness
    60.0 inches
    Vertical Fall
    2500ft
    Slab Width
    1700.00ft
    Weak Layer Grain type
    Faceted Crystals
    Slab Layer Grain Type
    Wind packed
    Images
    Football Field Crown
    Saddle Peak Avalanche from Hwy
    Saddle Peak avalanches
    Natural Saddle Peak Deep Slab Debris
    Natural Saddle Peak Deep Slab Crowns 2
    Natural Saddle Peak Deep Slab Crowns
    Natural Saddle Peak Deep Slab 2
    Natural Saddle Peak Deep Slab
    Attached Videos
    Saddle Peak Deep Slab Avalanche - 8 Feb 2020
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    19-20
    Subscribe to 19-20