Regional Conditions for Lionhead Range

as of 5:00 am
Today0" | N/A
Apr 19 0" | 5-10 W
Apr 18 1" | N/A
8775′     4/09 at 3:00
21 ℉
NW - 6 mph
Gusts 20 mph
7750′   04/20 at 7:00
34℉
75″ Depth
Bottom Line:

Past 5 Days

Fri Apr 13

None
Sat Apr 14

None
Sun Apr 15

None
Mon Apr 16

None
Today

None

Photos- Lionhead Range

  • Cornices are a significant hazard this time of year. As temps warm above freezing, these overhanging masses of snow will become increasingly unstable. They can break farther back than you might expect and trigger large avalanches on the slopes below. They can fail naturally or with human triggers. 

  • This slide was triggered by the first skier of day off Saddle Peak. The skier was caught and carried 1,500 vertical feet. He was buried with his hand sticking out of snow. Unfortunately, he did not have a partner and was buried for over an hour. He did not survive. Photo: R. Gregoire   

  • This slide on Saddle Peak resulted in a fatality. It was triggered by a solo skier who was caught and buried. The slope was heavily wind loaded and the slide failed on a thin ice crust. Photo: R. Gregoire

  • Wet loose avalanches will be a growing concern as spring progresses. Sunshine, above freezing temps and rain can all produce dangerous wet snow avalanches. Watch for signs of instability such as roller balls, small point releases and wet snow above your boot top. Avoid being on or underneath steep slopes if signs on instability are observed. Photo: BBSP 

  • The crown ranged from 1-3' deep and was 75-100' wide. The avalanche was new, windblown snow on top of a thin ice crust. Aspect is east, slope angle is 37 degrees, and elevation is 9019'. Photo: GNFAC

  • Looking down the path with the burial location marked. Photo GNFAC

  • Looking down the path from the crown. The "X" marks the burial location. Photo: GNFAC

  • Looking uphill about half-way down the path. The crown can be seen at the skyline. Photo: GNFAC

  • The distance from the burial location to the crown line (seen at the top of path at the skyline) was 1500' vertical. The skier was buried with his hand sticking out of the snow. His head was about 1.5' from the surface.  Three rescuers got to him 75 minutes after he was caught. Photo: GNFAC

  • Large cornices loom over the slope where a skier triggered a fatal slide on Saturday (4/14) on Saddle Peak in the Bridger Range. Photo: P. Maleski

  • Both the crown and the victim's location are marked on the photo. The skier was carried 1500 vertical feet downslope and buried near the toe of the debris. Rescuers reached him 75 minutes after the slide occurred, but the avalanche was fatal. Photo: GNFAC

  • The avalanche was triggered by a solo skier, the first tracks of the day. The crown is marked, and the slide carried him down the path where he was fatally buried. Photo: GNFAC

  • A skier triggered the slide a few hundred feet from the top on a 37 degree rollover that was wind-loaded with the previous days 30" of new snow. The crown was 1-3 feet deep and 75-100 feet wide. Photo: GNFAC

  • The Bridger Bowl weather station is buried by the new snow. Photo: BBSP

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  • Snow water equivalent of the snowpack at primary SNOTEL sites within the GNFAC advisroy area from October 1, 2017 through April 8, 2018.

  • These cornices at the head of Sunlight Basin in Taylor Fork are bigger than big. The snow lip is a solid 30 feet away from the true ridge crest and could easily fool a rider or skier into getting too close to the edge. We are finding similar cornices in all our ranges. As the temperatures warm these overhangs will start to lose strength. Photo: GNFAC

  • A skier observed this wet avalanche on a NE aspect near Hebgen Lake. It was estimated to have run about 1000'.  Warmer temperatures will be on the horizon, straining already massive cornices, and spring snowfall will continue to build these cornices and sculpt wind slabs near ridge tops. Photo: R. Teat

  • Debris from a cornice fall that pulled out a small wind slab on Mt. Bole in Hyalite (3/27). Photo: GNFAC

  • South of Cooke City, a recent slab avalanche up Republic Creek from Monday (3/26).  A wind loaded, north facing slope around 9,700'. Photo: B. Fredlund

  • A cornice fall triggered this avalanche on Lionhead Ridge that broke sometime late Saturday (3/24). Photo: B. Rasmussen

  • Reactive snow on steep edge of tree well. Sluffing or cracking on small rolls and micro-terrain features is a sign that loose slides or soft slabs are possible and may run far on larger, steep terrain. Photo: H. Coppolillo

  • Big Sky ski patrol triggered this slide with explosives on Sunday (3/25). It is in a heavily wind loaded pocket. Heavy snow and strong wind formed fresh slabs on Saturday. Many have gained strength, but are possible to trigger for a day or two. Photo: BSSP

  • Big Sky ski patrol triggered this slide with explosives on Sunday (3/25). Heavy snow and strong wind formed fresh slabs on Saturday. Many have gained strength, but are possible to trigger for a day or two. Photo: BSSP

  • There is 7' of snow on the ground in Bacon Rind (HS 240 cm) and it is stable today. The main concern is the new snow above the ice crust that formed 10 days ago (seen as the stripe behind the shovel) and in two snowpits our stability tests did not propagate. Melting, rain and/or more snow with wind would change the stability, but for now it's good. Photo: GNFAC

  • The snowmobiler walked to the edge of the ridge when the cornice broke carrying him over a cliff. Photo: Fremont Co. SAR

  • Yesterday, (20 March) a snowmobiler was injured when a cornice broke and carried him down a slope and over a small cliff in the Centennial Range of Idaho between Sawtelle Peak and Mt. Jefferson. Fremont County Search and Rescue reported the rider was injured and ambulatory, and evacuated by air ambulance to a hospital.

  • Cornices will be a problem for the remainder of the season. It's best to give these overhanging chunks of snow a wide berth along the ridgelines and limit time on slopes below. Photo: B. Zavora 

  • A mountain goat contemplates the loose, wet snow avalanches in the northern Madison Range. Photo: B. VandenBos

  • Wet loose avalanches can be seen in lower elevation gullies on southwest facing slopes of Sphinx Mountain. Photo: B. VandenBos

  • Roller balls are a sign that the surface snow is getting moist. As these become more numerous and grow in size, they indicate that the surface snow is getting wet enough to create shallow, loose snow avalanches. Photo: H. Coppolillo

  • Wind slabs 1-2' thick were triggered by skiers on Saturday 3/10. These are good examples of wind loaded slopes on cross-loaded features. 

  • Wet loose avalanches ran naturally when sun warmed up a few inches of new snow last week. Be cautious of travel on and below steep, sunny slope when the snow surface is wet, or if you see rollerballs or natural wet avalanches. Photo: GNFAC

  • Cornices are massive throughout the advisory area. Avoid slopes directly below and keep a far distance back from the edge of ridgelines. Cornices can break farther back than expected. They will weaken and break naturally with warmer temperatures and sun. Photo: GNFAC

  • This avalanche seemed to be skier triggered yesterday. The slope was located across from Bacon Rind on the east side of Highway 191. A pocket of wind-loaded snow looks to be a couple feet deep and 30' wide. Photo: GNFAC

  • A skier triggered this small soft slab avalanche on an easterly aspect at 9,100' outside Cooke City. It broke in the new snow, likely at a density change. Instabilities like this are typically short-lived...like a day.Photo: B. Fredlund

  • Cornice (CARnice) formation from light wind and low density snow in town is a clue that wind transporting snow is likely in the mountains. Photo: L. Zukiewicz

  • Skiers near Hebgen Lake reported: "...we did observe an isolated skier triggered slide on a steep, south facing, rocky rollover in the bottom of one of the trapper slidepaths that broke about 16 inches deep on an ice crust." Photo: A. Pohl 

Videos- Lionhead Range

Weather Forecast Lionhead Range

Extended Forecast for

10 Miles WNW West Yellowstone MT

  • Today

    Today: Sunny, with a high near 44. North wind around 14 mph, with gusts as high as 22 mph.

    Sunny

    High: 44 °F

  • Tonight

    Tonight: Mostly clear, with a low around 27. North wind 5 to 13 mph, with gusts as high as 20 mph.

    Mostly Clear

    Low: 27 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 46. East wind 5 to 10 mph becoming southwest 11 to 16 mph in the afternoon. Winds could gust as high as 24 mph.

    Mostly Sunny

    High: 46 °F

  • Saturday
    Night

    Saturday Night: Partly cloudy, with a low around 27. Southwest wind 7 to 16 mph becoming north after midnight. Winds could gust as high as 24 mph.

    Partly Cloudy

    Low: 27 °F

  • Sunday

    Sunday: Mostly sunny, with a high near 45. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Mostly Sunny

    High: 45 °F

  • Sunday
    Night

    Sunday Night: A chance of snow before 7pm, then a chance of rain and snow between 7pm and 11pm, then a chance of snow after 11pm.  Mostly cloudy, with a low around 30. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Chance
    Rain/Snow
    then Chance
    Snow

    Low: 30 °F

  • Monday

    Monday: Snow.  High near 35. Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Snow

    High: 35 °F

  • Monday
    Night

    Monday Night: A slight chance of snow before midnight.  Mostly cloudy, with a low around 22.

    Slight Chance
    Snow then
    Partly Cloudy

    Low: 22 °F

  • Tuesday

    Tuesday: Sunny, with a high near 41.

    Sunny

    High: 41 °F

The Last Word

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