Trip Planning for Lionhead Range

as of 5:00 am
Dec 60″ | 15-25 SW
Dec 5 6″ | 10-35 SW
Dec 4 0″ | 10-25 SW
9420′     12/07 at 04:00
8.8℉
SW - 20mph
Gusts Unknown mph
7750′     12/07 at 03:00
19℉
46″ Depth
Bottom Line: The southern mountains, including the area around Cooke City and West Yellowstone have gotten 2-3 feet of snow in the last week. Although the snowfall has tapered off, the wind has not. Wind redistributes snow and creates new loading. As far as the snowpack is concerned, it is still snowing out. The snowpack needs time to adjust to this new load and it is not advisable to get into avalanche terrain. Avalanches can break 2-4 feet deep. They can be large and deadly.
Primary Problem: Persistent Weak Layer

Past 5 Days

Fri Dec 2

High
Sat Dec 3

Considerable
Sun Dec 4

Considerable
Mon Dec 5

Considerable
Tue Dec 6

Considerable

Relevant Avalanche Activity

Lionhead Range
Lionhead Ridge
Large Natural on Lionhead, Airplane Bowl
Incident details include images
Incident details contain video
Lionhead Ridge
HS-N-R3-D2.5-O
Elevation: 9,500
Aspect: NE
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

From IG 12/3: It was natural. Happened last night or this morning. It hadn't slid when we left yesterday. We were first tracks in today, and there were no tracks above or below this slide. Crown at the peak was around 6'. Average 2-3' crown. 10' debris piles at least.


More Avalanche Details
Lionhead Range
Lionhead Ridge
Numerous large avalanches along Lionhead Ridge
Incident details include images
Lionhead Ridge
SS-R2-D2
Coordinates: 44.7145, -111.3180
Caught: 0 ; Buried: 0

A number of large avalanches observed along Lionhead Ridge on 12/2. 


More Avalanche Details

Relevant Photos

Displaying 1 - 16
  • Participants in the West Yellowstone Avalanche Fundamentals Field Session found unstable conditions near "Ski Hill" in the Lionhead area on December 6, indicating that large, human-triggered avalanches are possible. Photo: GNFAC

  • From IG 12/3: "It was natural. Happened last night or this morning. It hadn't slid when we left yesterday. We were first tracks in today, and there were no tracks above or below this slide. Crown at the peak was around 6'. Average 2-3' crown. 10' debris piles at least." Photo: R. Malmstrom

  • From IG 12/3: "It was natural. Happened last night or this morning. It hadn't slid when we left yesterday. We were first tracks in today, and there were no tracks above or below this slide. Crown at the peak was around 6'. Average 2-3' crown. 10' debris piles at least." Photo: R. Malmstrom

  • Photo: R. Malmstrom

  • Lots of avalanche activity. Lots of cracking and propagation from the skis. Photo: R. Malmstrom

  • Lots of avalanche activity. Lots of cracking and propagation from the skis. Photo: R. Malmstrom

  • Lots of avalanche activity. Lots of cracking and propagation from the skis. Photo: R. Malmstrom

  • Lots of avalanche activity. Lots of cracking and propagation from the skis. Photo: R. Malmstrom

  • Lots of avalanche activity. Lots of cracking and propagation from the skis. Photo: R. Malmstrom

  • A snowmobiler noted cracking of the snow surface on the south face of Reas Peak out of Island Park. The wind crust was 3-4" thick and had facets underneath which aided the propagation. Photo: Anonymous

  • Big Sky ski patrol triggered these slides with explosives on 11/22 during routine avalanche mitigation work. The avalanches were hard slabs that averaged 12" deep and broke on a weak layer above a crust on top of snow that fell in October. Photo: BSSP

  • Big Sky ski patrol triggered these slides with explosives on 11/22 during routine avalanche mitigation work. The avalanches were hard slabs that averaged 12" deep and broke on a weak layer above a crust on top of snow that fell in October. Photo: BSSP

  • Observer reported "A number of Avalanche Crowns on an east aspect at 9500 ft." in Tepee Basin.

  • An observer reported "A number of Avalanche Crowns on an east aspect at 9500 ft." in Tepee Basin

  • Evidence of wind-loading creating the conditions for avalanches in the Bridger Range. Cracking is an indicator of instability. The observer noted this was "Nothing consequential," but this shows that unstable drifts are forming. They will be more consequential where there is more snow and as the wind creates larger drifts. Photo: E Smith

  • We completed the setup of a SNOdar snow depth sensor on Sawtelle Peak in the Centennials on Wednesday 10/19. Forecaster Ian Hoyer for scale.

    Located at 8800 feet elevation. The sensor will record total snow depth and 24 hr snowfall. Data will be displayed on our website soon at: http://www.mtavalanche.com/weather/stations/sawtelle-snow.

WebCams


Rendezvous Ski Trail, W. Yellowstone

Snowpit Profiles- Lionhead Range

 

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Weather Forecast Lionhead Range

Extended Forecast for

10 Miles WNW West Yellowstone MT

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 15. Wind chill values as low as -5. South southwest wind 10 to 15 mph, with gusts as high as 22 mph.

    Decreasing
    Clouds

    High: 15 °F

  • Tonight

    Tonight: Partly cloudy, with a low around 5. Wind chill values as low as -10. Southwest wind around 10 mph.

    Partly Cloudy

    Low: 5 °F

  • Thursday

    Thursday: A 30 percent chance of snow.  Mostly cloudy, with a high near 11. Wind chill values as low as -10. South southwest wind 11 to 17 mph, with gusts as high as 25 mph.  Little or no snow accumulation expected.

    Chance Snow

    High: 11 °F

  • Thursday
    Night

    Thursday Night: A 20 percent chance of snow after 11pm.  Mostly cloudy, with a low around 10. Wind chill values as low as -5. South wind around 16 mph, with gusts as high as 23 mph.

    Slight Chance
    Snow

    Low: 10 °F

  • Friday

    Friday: Snow.  High near 14. South wind 14 to 16 mph, with gusts as high as 24 mph.  Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    Snow

    High: 14 °F

  • Friday
    Night

    Friday Night: A 30 percent chance of snow, mainly before 11pm.  Mostly cloudy, with a low around 9. South southwest wind around 16 mph, with gusts as high as 20 mph.  Little or no snow accumulation expected.

    Chance Snow

    Low: 9 °F

  • Saturday

    Saturday: A 40 percent chance of snow.  Mostly cloudy, with a high near 18. South wind 16 to 18 mph, with gusts as high as 24 mph.  New snow accumulation of less than one inch possible.

    Chance Snow

    High: 18 °F

  • Saturday
    Night

    Saturday Night: Snow likely, mainly after 11pm.  Mostly cloudy, with a low around 16. South wind around 15 mph, with gusts as high as 21 mph.

    Snow Likely

    Low: 16 °F

  • Sunday

    Sunday: Snow.  Cloudy, with a high near 21.

    Snow

    High: 21 °F

The Last Word

Watch our playlist of YouTube videos to get caught up on our avalanche concerns this season.

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