Photos

A party of three skiers remote triggered avalanche with at least 6' crown off N face of Mt Porphry along rockband near summit on 12/29/19. They triggered it after tyhey had found "Three pits dug on NE face ascending Mt Porphry indicating increasing stability and no clean propagation. Approx 150-210 cm deep snowpack." Photo: G. Alsentzer

From e-mail: "Toured in Beehive today. Good snow but very windy. Pics show a large avalanche in the area where “Going Home” ends. Lighting was difficult so not that clear. There was a smaller slide just to the right of the picture and one chute from the end of “Going Home”.

The slide pictures took out some small trees. I was surprised how far into the low angle the debris ran.

Hard to know if this was skier triggered but there were one set of tracks coming down Going Home." Photo: A. Crawford

From e-mail: "Toured in Beehive today. Good snow but very windy. Pics show a large avalanche in the area where “Going Home” ends. Lighting was difficult so not that clear. There was a smaller slide just to the right of the picture and one chute from the end of “Going Home”.

The slide pictures took out some small trees. I was surprised how far into the low angle the debris ran.

Hard to know if this was skier triggered but there were one set of tracks coming down Going Home." Photo: A. Crawford

We saw this avalanche crown on our drive up Bridger Canyon on Friday (1/3). It looks at least 3' deep and broke near the ridge on a heavily wind loaded slope. Photo: GNFAC

This natural avalanche was on Town Hill, outside Cooke City, on a SE aspect about 7,800'. Photo: B. Fredlund

This small wind slab was remotely triggered while skinning into the Maid of the Mist basin. Throughout the day they continued to encounter other small, reactive wind slabs and strong winds. Small avalanches are a warning sign that larger ones are possible. Photo: Sam Wilson

This avalanche was triggered on Friday, Dec 27 by a snowmobiler. It was 3 feet deep, NE aspect at 10,200 feet and released on facets at the ground. Photo: GNFAC

This avalanche was triggered by a snowmobiler on Friday, 27 Dec. It was adjacent to one that already slid earlier in the day. It broke 4-6 feet deep and could have killed someone. It was a heavily wind-loaded slope that broke on sugary facets near the ground. Photo: GNFAC

This avalanche below Chimney Rock was triggered on Friday, 27 December, by a snowmobiler. He was not caught. It failed on sugary facets near the ground. This slope is heavily wind loaded and faces NW. Photo: GNFAC

View of the second slide on Henderson Mountain from beneath. 12/27/2019. Photo: T. Juelson

Avalanche in 2nd Yellowmule. Likely broke during storm on 12/24. Less than a foot deep but ~150 ft wide. Photo: GNFAC

Skiers reported: "Two new [trigger unknown] avalanches on the east side of Henderson today. The first photo is from this morning (12/27/19) around 11:00. The second one appears to be much deeper and I didn't notice it until I rode back by around 2:30, so it might have occurred while I was out skiing or I just missed it this morning." Photo: H. Coppolillo

Skiers reported: "Two new [trigger unknown] avalanches on the east side of Henderson today. The first photo is from this morning (12/27/19) around 11:00. The second one appears to be much deeper and I didn't notice it until I rode back by around 2:30, so it might have occurred while I was out skiing or I just missed it this morning." Photo: H. Coppolillo

A natural avalanche observed on 12/26 from Lionhead Ridge. This slide likely broke during the storm on Christmas Eve. The avalanche is approximately 100 ft wide and on an east facing slope. It appears to have broken on a weak layer mid-pack.

Photo: GNFAC

Although there was 3' of snow at 8,200' on the Throne, the snowpack was very thin for most of the way in. Photo: GNFAC

We dug this snowpit in Denny Creek at the base of Lionhead Ridge near West Yellowstone on 12/22. An poor snowpack structure makes large avalanches possible to trigger. Photo: GNFAC

Skiers saw several old natural avalanches crowns in Republic Creek on 12/21. (all were E, or NE aspects). This one was seen last weekend (12/14). It broke near the ground and is now filled in by drifted snow. Photo: B. Fredlund

Skiers saw several old natural avalanches crowns in Republic Creek on 12/21. (all were E, or NE aspects). Photo: B. Fredlund

Skiers saw these natural avalanche crowns in Republic Creek on 12/22. Photo: B. Fredlund