Photos

This natural avalanche on the SE shoulder of Mt Abundance avalanches regularly from wind-loading. Photo: S. Strenge

This avalanche on the east face of Wolverine Peak outside Cooke City was triggered by a cornice on 24 February. Although it did not propagate wide, it ran far. Photo: S. Strenge

This small natural avalanche was seen by snowbikers in Beaver Creek in the southern Madison Range on 24 February. Photo: J. Stumne

A natural wind slab avalanche beneath a cornice on Henderson Mountain, near Cooke City. It appears to have broken at the new-old interface, 2-3 ft deep and ~300 ft wide. Likely ran overnight on Monday 2/22/21 or early morning Tuesday 2/23/21. 

Photo: GNFAC

A skier saw this natural avalanche at 9,000' on the east side of Republic Mountain on Tuesday, 2/23. Photo: J. Dobronyi

The Angry Hairpiece in the Lone Lake Cirque broke as a deep slab sometime in the last 24 hours (Monday, 2/22). Photo: Big Sky Ski Patrol

The Friends of the Avalanche Center, in partnership with the City of Bozeman, put in a Beacon Park at Beall Park. It is located on the north side of the Beall building between N. Bozeman Ave. and the ice rink. Stop by with your avalanche transceiver and do a few practice rescue drills. Your partner will thank you. Photo: S. Regan

This natural avalanche occurred on a slope that was wind drifted with cross-slope winds. It was a NE facing slope at 9,000 feet and likely ran over the weekend (2/20). Photo: GNFAC

This natural avalanche was likely triggered by a falling cornince in the last day or two. The slope is in the Wilderness and was seen from the boundary. Wind drifted snow is a concern in this area. Photo: GNFAC

From Obs: "This slide on the ridge extends north from Blackmore above Blackmore lake. The slide was on a north-facing slope around 9,100'. The crown looked multiple feet deep and either meandered, partially hidden from view, by another ridge or a substantial second avalanche a hundred feet away." 

From obs: "Observed 2 natural avalanches, both on the basal persistent layer I would guess. one maybe a week old, partially filled in (SS-N-D1R2-O), and one that ran in the last 24 hrs (SS-N-D1.5R2-O) on a SE aspect, 35 deg at 8200 ft. I thought it was interesting given the lack of new snow and seeming lack of strong winds in this area." Photo: S. Hennessey 

From email: "Observed natural deep slab probably happened overnight with the strong winds... snowpack in the area was about 3-5’ deep mostly 4F with 20+cm of F depth hoar at the bottom... obviously not strong enough to support the wind-load." Photo: T Thorn

This large hard-slab avalanche was snowmobile-triggered on Saturday (2/20). It broke nearly 10' deep and approximately 200' across. It left large chunks of debris that piled up about 8' deep at the bottom. Photo: GNFAC

This large hard-slab avalanche was snowmobile-triggered on Saturday (2/20). It broke nearly 10' deep and approximately 200' across. Photo: GNFAC

Snowmobile-triggered avalanche occurred on Saturday (2/20) at the entrance to McAtee Basin. It broke on a 40-45 degree slope on old snow near the ground. Photo: GNFAC

Snowmobile-triggered avalanche occurred on Saturday (2/20) at the entrance to McAtee Basin breaking on old snow near the ground. Photo: GNFAC

We saw this crown on 2/20/21. It likely broke 2/19 or 2/18. Photo: GNFAC

We saw this crown on 2/20/21. It likely broke 2/19 or 2/18. Photo: GNFAC

"Here’s one more photo of some of the lower crown of that slide up Flanders. It was deep down lower!" Photo: S. Reinsel

From obs [2/20/21]: "We observed a large natural slide on Flanders Mountain that likely occurred on Thursday (2/18/21). The crown ranged from 2-5’, but it’s hard to gauge how wide it was, because it covered a lot of elevations. I think there is considerable overlap with the large slide that ran there earlier this season. We did not observe any other slides, collapsing, or cracking, but the wind did pick up in the early afternoon." Photo: S. Reinsel