Photos

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Northern Gallatin, 2018-12-10

Small fresh wind slab crowns below ridgeline in the Northern Bridgers. Photo: G. Antonioli

Northern Gallatin, 2018-12-04

Wind loads were easy to trigger. This one was triggered on purpose up Maid of the Mist in Hyalite. Photo: A. Peterson

Skier triggered wind slabs in Hyalite
Northern Gallatin, 2018-12-04

Wind slabs were easily triggered. Although small in size, they indicate that larger slopes would have larger avalanches. Photo: A. Peterson

Skier triggered wind slabs in Hyalite
Bridger Range, 2018-12-04

Strong winds on Tuesday (12/4) drifted recent low density snow into thick slabs at ridgelines, and mid to lower elevations in the Bridger Range. Photo: GNFAC

Bridger Range, 2018-12-04

Strong winds on Tuesday (12/4) drifted recent low density snow into thick slabs at ridgelines, and mid to lower elevations. Photo: GNFAC

Northern Madison, 2018-12-04

From some skiers: "We encountered veey localized loading that easily fractured and propagated uphill on a south aspect." Photo: S. Reinsel

Skier triggered wind slab in Beehive
Northern Madison, 2018-12-04

From some skiers: "We encountered veey localized loading that easily fractured and propagated uphill on a south aspect." Photo: S. Reinsel

Skier triggered wind slab in Beehive
Northern Gallatin, 2018-12-04

This picture is from Divide Basin in Hyalite Canyon. A skier writes, "Lots of blowing snow with multiple natural avalanches occurring during the morning." Photo: S. Wilson

Multiple wind slab avalanches in Hyalite
Northern Gallatin, 2018-12-04

15-30 mph westerly winds were blowing snow up Hyalite and among the other ranges. Photo" S. Wilson

Multiple wind slab avalanches in Hyalite
Northern Madison, 2018-12-03

Skiers triggered these loose snow avalanches on Sunday (12/2) on a west-southwest aspect in Beehive Basin. Photo: T. Allen

Skier triggered loose snow in Beehive 2
Northern Gallatin, 2018-12-03

Hyalite got 8-10" of low density snow and there were widespread natural dry loose avalanches on Saturday. Photo: G. Antonioli

Natural and skier triggered loose snow and wind slabs northern ranges
Northern Madison, 2018-12-03

From e-mail: "triggered a small wet slide in the Going Home chute coming back into Beehive, and we observed another natural wet slide on a similar aspect that had occurred since we toured past in the morning. Wind was light or calm all day and wind effect was minimal even at ridgelines." Photo: C. Kussmaul

Skier triggered loose snow in Beehive
Northern Madison, 2018-12-03

From e-mail: "triggered a small wet slide in the Going Home chute coming back into Beehive, and we observed another natural wet slide on a similar aspect that had occurred since we toured past in the morning. Wind was light or calm all day and wind effect was minimal even at ridgelines." Photo: C. Kussmaul

Skier triggered loose snow in Beehive
Northern Madison, 2018-12-03

Skiers in Beehive on Sunday (12/2) reported lots of previous natural point releases. Photo: H. Copolillo

Natural and skier triggered loose snow and wind slabs northern ranges
Bridger Range, 2018-12-03

We observed this old avalanche on Sunday 12/2. It may have broke up to a week prior, on weak facets that formed in mid-November. Photo: GNFAC

Bridger Range, 2018-12-03

We observed this wind slab and debris on Sunday (12/2). It likely formed from the new snow and wind on Saturday morning. Photo: GNFAC

Natural and skier triggered loose snow and wind slabs northern ranges
Bridger Range, 2018-12-03

We observed this wind slab crown on Sunday (12/2). It likely formed from the new snow and wind the Saturday morning. Photo: GNFAC

Natural and skier triggered loose snow and wind slabs northern ranges
Bridger Range, 2018-12-01

Steep, wind loaded slopes had fresh drifts, 6" deep and 10-30' wide that were easy to trigger on Saddle Peak (12/1). Photo: GNFAC

Natural and skier triggered loose snow and wind slabs northern ranges
Bridger Range, 2018-12-01

Cracking of fresh drifts was a sign that avalanches were likely on steep, wind loaded slopes on Saddle Peak. Photo: GNFAC

Northern Madison, 2018-11-29

In Beehive Basin, the snowpack is thin and weak on west and south facing slopes. A poor snowpack structure will make slab avalanches likely on these slopes with the arrival of new and wind-blown snow. Photo: GNFAC.