Photos

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Cooke City, 2020-03-28

From email on 3/27/2020 : "natural slab avalanche I observed today near Cooke City.  An easterly aspect around 9,400'.  I'd estimate the crown to be 2-3' deep and about 100' wide.  Looks like it was triggered by a cornice fall (2-3 days ago?)."

Photo: B. Fredlund

Link to Avalanche Details
Northern Gallatin, 2020-03-28

Main Fork of Hyalite 3/27.

From obs: "This slide popped on a N aspect at 9000', ranging from 18-30 inches deep... it slid on a crust." Photo: N. Iltis

Link to Avalanche Details
Lionhead Range, 2020-03-27

Today on the east side of Lionhead Ridge we found a layer of weak, near-surface facets buried under a foot and a half of new snow. This is definitely something to watch out for especially on wind-loaded slopes. Photos: GNFAC

Southern Madison, 2020-03-27

Today we rode into the Taylor Fork and Lionhead areas to remove our weather stations for the season. Photo: GNFAC

Lionhead Range, 2020-03-27

Enormous cornices overhanging Lionhead Ridge. Photo: GNFAC

Bridger Range, 2020-03-27

Significant cornice growth and wind transport on Bridger Ridge. Photo: T. Allen

Northern Madison, 2020-03-27

From email: "Was up Dudley creek today. Northern madison. Saw 2 step down avalanches on ne aspect high elevation... One ... seemed cornice triggered within 12 hrs of our tour this morning (3/26). The 2nd avalanche is in the lower photo and was probably skier trigger intentional.... It looks like they triggered a fresh wind slab under ridge, maybe ski cut, which stepped down into some older layers"


Photo: L. Frye

Bridger Range, 2020-03-27

From obs: "We toured up in the Throne area today. Moderate winds were blowing snow at mid elevations and ridgetops. We found dry boot top powder on East facing slopes, the snow skied upside down. We observed loose and slab avalanches on many aspects up high and at mid elevations, all looked like new snow avalanches that happened yesterday. I’ve attached a photo of an east facing slope near the Throne."  Photo: S. Jonas

Link to Avalanche Details
Cooke City, 2020-03-27

From obs: "Wind Loaded slope. 2ft Crown. 100ft wide. firm, crusty bed surface. The avalanche was released by a ski cut." Photo: Anonymous

Link to Avalanche Details
Northern Madison, 2020-03-27

Two natural avalanche in Beehive Basin. The obvious avalanche was observed by skiers mid-day. There is another crown in the shadows of an avalanche that occurred earlier in the day.

Photo: J. Caton

Link to Avalanche Details
Northern Gallatin, 2020-03-27

From obs: "Later in the day we ran across what we assume to be a remotely triggered avalanche from another party in the area. There were two sets of tracks on the adjacent slope with cracks visible on the slope. The avalanche occurred on a 40* east aspect at 9250' and failed on the MFcr/FC dn 35cm. We looked at the crown profile, and the structure was very similar to what we found on souths. 35cm of F->4F PP/DF overlaying MFcr/FC. We did an ECT on the crown and it failed on isolation. Skiing out the trail with better light than in the morning, we saw a number of similar avalanches confined to east aspects on steep 40*+ rolls and presumably failing on the persistent grains above the crust." Photo: E. Coba

Link to Avalanche Details
Bridger Range, 2020-03-27

A skier triggered slide on a windloaded slope just north of Bridger Bowl. The skier lost their ski in the slide. Photo: R. Anderson

Link to Avalanche Details
Northern Madison, 2020-03-27

From obs: "An avalanche was triggered by a skier on the East facing wall of Beehive Basin. The slide broke on the crust layer from last week. The crown was roughly 100' wide."

Photo: C. Samuels

Link to Avalanche Details
Bridger Range, 2020-03-25

In the Bridger Range, avalanches released naturally on a density change in the new snow sometime Tuesday night (3/24). Photo: E. Knoff

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Bridger Range, 2020-03-25

In the Bridger Range, avalanches released naturally on a density change in the new snow sometime Tuesday night (3/24). Photo: E. Knoff

Link to Avalanche Details
Northern Gallatin, 2020-03-25

Snowfall throughout the afternoon fluctuated between S1 - S5 (during brief squalls). The winds started out moderate and from the west but calmed by the last lap ~5 pm. The new snow (from last night/this morning) was fairly well bonded to the sun/melt-freeze crust below, but the storm came in subtly upside down. Today’s snowfall (accumulating ~3” while skiing between 1-530) was light. Right along the ridgeline, we triggered 4 predictable small storm slabs 4~6” deep on the upside-down storm snow from last night/this morning, but surprisingly not on the old crust. They were each 5-10m wide x 5m long and only ran ~5m vertically. Photo: Z Miller

Link to Avalanche Details
, 2020-03-25

This is a photo of a small roof avalanche near Island Park. Warming temperatures cause water to percolate through the snow which lubricates the sliding surface. Roof avalanches have injured and killed people in the past, just one more thing to worry about. Photo: M.E. 

Bridger Range, 2020-03-24

Dave Zinn digs a hand pit along the ridge to assess how the new snow is sticking to the ice crust. Photo: GNFAC

Northern Madison, 2020-03-23

"Was out today and found buried surface hoar 10-15 cms down. Some previous natural activity on this layer on steeper north aspects with very shallow soft slabs, but mostly dry loose at this point. Not much slab formation since the last ppt event. This could be a problem when more snow and wind in the next few days." Photo: T. Woodward

Link to Avalanche Details
Lionhead Range, 2020-03-23

Obs: "School bus size cornices over Easterly portions of Lionhead Ridge. It is hard to tell from the photo, but the largest cornices were about 20-25' tall. We dug a few pits on East Facing slopes between 9,000-9,500 ft with the worst result being an ECTN-21 however these Cornices are primed and ready to fall with the abundant sunshine and warming weather." Photo: JR