Trip Planning for Lionhead Range

as of 5:00 am
Dec 91″ | 20-40 SW
Dec 8 0″ | 10-20 SW
Dec 7 1″ | 25-55 SW
9420′     12/10 at 00:00
5.5℉
SW - 21mph
Gusts Unknown mph
7750′     12/10 at 00:00
15℉
51″ Depth
Bottom Line: There is weak snow buried 2-3 ft deep that could avalanche under the weight of a skier or rider today. Natural avalanches have become unlikely, but human triggered slides remain possible. Dig to search for and test these weak layers in the middle of the snowpack before riding steep slopes. Be doubly skeptical of the weak layers if they are sitting beneath hard slabs of wind drifted snow. Also watch for thin fresh drifts forming today as new snow accumulates.
Primary Problem: Persistent Weak Layer

Past 5 Days

Mon Dec 5

Considerable
Tue Dec 6

Considerable
Wed Dec 7

Considerable
Thu Dec 8

Moderate
Fri Dec 9

Moderate

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

 

Select a snowpit on the map to view the profile image

Weather Forecast Lionhead Range

Extended Forecast for

10 Miles WNW West Yellowstone MT

  • Overnight

    Overnight: Mostly cloudy, with a low around 8. Wind chill values as low as -10. South southwest wind 18 to 21 mph, with gusts as high as 24 mph.

    Mostly Cloudy

    Low: 8 °F

  • Saturday

    Saturday: A 30 percent chance of snow, mainly after noon.  Cloudy, with a high near 20. Wind chill values as low as -10. Breezy, with a south southwest wind 20 to 28 mph, with gusts as high as 34 mph.  New snow accumulation of 1 to 2 inches possible.

    Chance Snow
    and Breezy

    High: 20 °F

  • Saturday
    Night

    Saturday Night: A 50 percent chance of snow.  Mostly cloudy, with a low around 18. South wind 16 to 21 mph, with gusts as high as 25 mph.  New snow accumulation of 1 to 3 inches possible.

    Chance Snow

    Low: 18 °F

  • Sunday

    Sunday: Snow.  High near 22. South wind around 17 mph, with gusts as high as 26 mph.  Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Snow

    High: 22 °F

  • Sunday
    Night

    Sunday Night: Snow.  Low around 15. Southeast wind 11 to 15 mph, with gusts as high as 22 mph.  Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    Snow

    Low: 15 °F

  • Monday

    Monday: Snow.  High near 17. Southeast wind around 11 mph becoming northwest in the afternoon.  Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Snow

    High: 17 °F

  • Monday
    Night

    Monday Night: A 50 percent chance of snow.  Mostly cloudy, with a low around 2. North wind around 14 mph.  New snow accumulation of less than a half inch possible.

    Chance Snow

    Low: 2 °F

  • Tuesday

    Tuesday: A chance of snow, mainly before 11am.  Partly sunny, with a high near 10. North wind around 11 mph.

    Chance Snow

    High: 10 °F

  • Tuesday
    Night

    Tuesday Night: A slight chance of snow.  Partly cloudy, with a low around -1.

    Slight Chance
    Snow

    Low: -1 °F

The Last Word

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