Photos

We saw this relatively very large, full width avalanches that was triggered on January 7, 2021. It broke on weak, sugary snow below hard wind drifted snow and recent new snow. Photo: GNFAC

We saw this relatively very large, full width avalanches that was triggered on January 7, 2021. It broke on weak, sugary snow below hard wind drifted snow and recent new snow. Photo: GNFAC

On 1/8/21 we saw this snowmobile triggered avalanches that occurred on January 7, 2021. It broke on weak, sugary snow below hard wind drifted snow and recent new snow. Photo: GNFAC

From obs: "the whumpf I had heard previously remotely triggered a series of 7-8 large cracks that ranged from 30-100 feet wide. ... As I carefully descended the meadow, I saw many more cracks throughout the slope from the same remote trigger event. Additionally, I triggered two more significant whumpfs with shooting cracks 10-40 feet wide. We determined our remote trigger was at least 300 feet away from where the snow collapsed and cracked"

Photo: L. Ippolito

From obs: "Shooting cracks and collapsing on the entire ascent to the Cinnamon Creek Lookout. Remotely triggered a R2-D2.5 on descent. 2-3 foot crown. Slide path was on an East facing slope at 9000ft. Failed on the same persistent weak layer being seen across most regions of the forecast zone."

Large natural avalanche south of Hardscrabble Peak near Fairy Lake. Likely broke during snowfall/wind on Thursday, Jan 7th.

On January 8, 2021 a group of skiers triggered an avalanche on The Fin outside Cooke City (pictured). Three were caught, two were injured and one was evacuated by helicopter due to serious injuries. Photo: A. Mallet

From obs on 1/8/21: "Observed numerous natural avalanches that had slid before this most recent snow storm. All on n or ne aspects going on the basal facets. Up to D2ish"

Photo: R. Griffiths

One of many avalanches on the Sage Basin Ridgeline. These were on east through northeast facing slopes at 9300' elevation. The avalanches failed on the weak facets near the ground. Photo: GNFAC

One of many avalanches on the Sage Basin Ridgeline. These were on east through northeast facing slopes at 9300' elevation. The avalanches failed on the weak facets near the ground. Photo: GNFAC

One of many avalanches on the Sage Basin Ridgeline. These were on east through northeast facing slopes at 9300' elevation. The avalanches failed on the weak facets near the ground. Photo: GNFAC

One of many avalanches on the Sage Basin Ridgeline. These were on east through northeast facing slopes at 9300' elevation. They avalanches failed on the weak facets near the ground. Photo: GNFAC

A sledder triggered this slide in Buck Ridge. Photo: M. Lennon

"We observed at least a half a dozen recent/ fresh slab avalanches north of Cooke City today. These slab avalanches were found: on all aspects, near ridgelines, and also on many aprons." Photo: B. Fredlund

"We observed at least a half a dozen recent/ fresh slab avalanches north of Cooke City today. These slab avalanches were found: on all aspects, near ridgelines, and also on many aprons." Photo: B. Fredlund

One of four small natural avalanches along Gallatin River that broke during the avalanche warning on January 5th, 2021.

Photo: GNFAC

 A skier had widespread collapsing, "whumphing" and cracking of the snowpack in Truman Gulch west of Bridger Bowl. Photo: P. Hinz

A large natural avalanche on Cedar Mountain was seen from the Yellowstone Club. Photo: N. Davies

"Big shooting crack across the south facing path from the skin track so expected the east bowl to remotely trigger and it did from 25m away on the ridge. R3D2 slide. Confirms all previous regional reports and the concerns of the day, typical in this specific area early season. Obsessive terrain management is the only way just now." Photo: Anon

"I was skiing down the apron at Bridger and noticed this slide on Bradley's that appeared to be skier triggered." Photo: B. O'Donoghue