24-25

large natural avalanche, NE Mt. Henderson

Henderson Mountain
Cooke City
Code
HS-N-R4-D2-O
Elevation
10090
Aspect
NE
Latitude
45.05240
Longitude
-109.94500
Notes

From obs "We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

2 photos attached.   A NE aspect, around 10,000'.

It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground." 

 

From obs: "We popped over to the recent avalanche on the east side and got a crown profile. Avalanche is NE facing, 10090. HS-N-D2-R4-O

Crown is 105 cm deep, breaking on surface hoar. Details are in attached profile 

Something noteworthy.. the slope angle at the crown is 30.1 degrees." 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
4
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
60.0 inches
Slab Width
500.00ft
Weak Layer Grain type
Surface Hoar
Images
E Henderson Crown Profile - 31 Dec
large natural avalanche, NE Mt. Henderson 2
large natural avalanche, NE Mt. Henderson 1
Snow Observation Source
E Henderson Crown Profile
large natural avalanche, NE Mt. Henderson
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
24-25

We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

2 photos attached.   A NE aspect, around 10,000'.

It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground.

Photo: B Fredlund 

Avalanche Details: large natural avalanche, NE Mt. Henderson
Forecast link: GNFAC Avalanche Forecast for Tue Dec 31, 2024GNFAC Avalanche Forecast for Wed Jan 1, 2025
Cooke City, 2024-12-30
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    • We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

    2 photos attached.   A NE aspect, around 10,000'.

    It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground.

    Photo: B Fredlund

    Avalanche Details: large natural avalanche, NE Mt. Henderson
    Forecast link: GNFAC Avalanche Forecast for Tue Dec 31, 2024
    Cooke City, 2024-12-30
    Access other image sizes:
  • Very Large 1200px
  • Large 480px
  • Medium 220px
  • Small 150px
  • Original

    • large natural avalanche, NE Mt. Henderson

    Date
    Activity
    Skiing

    We were ski touring on the SW side of Mt. Henderson today, and noticed a large (natural?) avalanche on the NE aspect of Henderson.  First observed at around 1:15pm.  It appeared to be very fresh, possibly from a remote trigger this morning.  

    2 photos attached.   A NE aspect, around 10,000'.

    It looked to be 4-6' deep and about 500' wide.  And it failed on snow at/ near the ground.

    Weather:  today alternated between heavy snowfall, and patches of sunshine.  Temps in the low/ mid 20's F, and calm winds.  A very nice day for ski touring.

    No other avalanche activity observed in Miller Creek.

    We experienced a couple of large collapses on westerly aspects/ in wind affected terrain around 10,000'.

    Region
    Cooke City
    Location (from list)
    Henderson Mountain
    Observer Name
    Beau Fredlund

    Sheep Creek

    Sheep Creek
    Cooke City
    Code
    SS-R1-D1
    Aspect
    N
    Latitude
    45.03440
    Longitude
    -109.98400
    Notes

    From email: "Skied ghost trees in Sheep Creek today. Still a little lean, but mostly good to go for taking clients. Surprised to only see one D1R1 soft Slab on steep north facing slope. No other avalanche activity seen on Miller Mountain, Mineral, Sunset and Republic Mountain. No cr/co." 

    Number of slides
    1
    Number caught
    0
    Number buried
    0
    Avalanche Type
    Soft slab avalanche
    R size
    1
    D size
    1
    Problem Type
    Storm Slab
    Snow Observation Source
    Sheep Creek
    Slab Thickness units
    centimeters
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    24-25

    Sheep Creek

    Date
    Activity
    Skiing

    From email: "Skied in Sheep Creek today. Still a little lean. Surprised to only see one D1R1 soft Slab on steep north facing slope. No other avalanche activity seen on Miller Mountain, Mineral, Sunset and Republic Mountain. No cr/co." 

    Region
    Cooke City
    Location (from list)
    Sheep Creek
    Observer Name
    Ben Zavora

    Avalanche in Beehive Basin

    Beehive Basin
    Northern Madison
    Code
    SS-ASc-R3-D1-I
    Elevation
    8200
    Aspect
    W
    Latitude
    45.34070
    Longitude
    -111.39100
    Notes

    We triggered a small avalanche in a terrain trap from a flat bench above in Beehive Basin. This slide (R3 D1) broke 150' wide, about a foot deep, and filled the creek bed below.

    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
    3
    D size
    1
    Bed Surface
    I - Interface between new and old snow
    Problem Type
    Storm Slab
    Slab Thickness
    12.0 inches
    Vertical Fall
    50ft
    Slab Width
    150.00ft
    Weak Layer Grain type
    Precipitation Particles
    Weak Layer Hardness
    F-
    Slab Layer Hardness
    1F+
    Images
    Crown of Beehive Basin Avalanche
    Beehive Basin Small Avalanche 2
    Beehive Basin Small Avalanche 1
    Attached Videos
    Avalanche in Beehive Basin - 30 December 2024
    Snow Observation Source
    Storm Snow and Avalanches in Beehive
    Slab Thickness units
    inches
    Single / Multiple / Red Flag
    Single Avalanche
    Advisory Year
    24-25
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