Photos

Displaying page 2 of photos 21 - 40 of 68
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

Link to Avalanche Details
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

Link to Avalanche Details
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.  

Northern Madison, 2018-11-29

In Beehive and Bear Basin, the snowpack is generally strong and stable on east and north facing slopes below treeline. Photo: GNFAC

Northern Gallatin, 2018-11-27

A skier triggered this small wind slab along a wind loaded ridge in Hyalite. Although small, it's an obvious clue wind loaded slopes are unstable. Even small slides can have severe consequences if triggered in steep-exposed terrain or on slopes with terrain traps such as gullies, trees or rock bands. Photo: G. Antonioli 

Northern Madison, 2018-11-27

Slopes loaded by west-southwest winds are the main avalanche concern. Cornices and natural avalanches are bull's eye information slopes are wind loaded and unstable. Watch for and carefully assess all slopes with wind drifted snow. This photo was taken in the northern Madison Range. Photo B VandenBos

Lionhead Range, 2018-11-27

Yesterday at Lionhead Ridge near West Yellowstone we found a shallow and weak snowpack. A foot of weak, sugary snow on the ground will create unstable conditions where it is buried by thick drifts of snow, and when the area gets more snow later this week. Photo: GNFAC

Bridger Range, 2018-11-26

This avalanche was triggered by explosives at Bridger Bowl. It illustrates the depth of the wind slabs to be on the lookout for. Photo: BBSP

Bridger Range, 2018-11-26

From an email: "We did observe a natural slide at around 8300ft that failed on the high pressure facets that formed prior to these last two shots of snow. It appears that it was triggered by a slough from steeper, rocky terrain above, the crown was about 14 inches deep and around 50ft wide, in complex rocky terrain. The debris pile was approx. 200cm deep, plenty deep to bury a person." Photo: A. Pohl

Link to Avalanche Details
Bridger Range, 2018-11-26

From an email: "We did observe a natural slide at around 8300ft that failed on the high pressure facets that formed prior to these last two shots of snow. It appears that it was triggered by a slough from steeper, rocky terrain above, the crown was about 14 inches deep and around 50ft wide, in complex rocky terrain. The debris pile was approx. 200cm deep, plenty deep to bury a person." Photo: A. Pohl

Link to Avalanche Details
Bridger Range, 2018-11-26

From an email:

"We did observe a natural slide at around 8300ft that failed on the high pressure facets that formed prior to these last two shots of snow. It appears that it was triggered by a slough from steeper, rocky terrain above, the crown was about 14 inches deep and around 50ft wide, in complex rocky terrain. The debris pile was approx. 200cm deep, plenty deep to bury a person."  Photo: A. Pohl

Link to Avalanche Details
Northern Gallatin, 2018-11-26

The new snow and wind formed wind slabs on Mt. Blackmore that were cracking. Photo: B. VandenBos

Northern Gallatin, 2018-11-26

Winds blew the new snow around. Ripples on the snow surface are evidence of wind slabs. Photo: B. VandenBos

, 2018-11-25

Snow water equivalent at SNOTEL stations in the GNFAC advisory areas for the 18-19 season to date. Weak layers formed on the surface of the snowpack during the dry weather (flat section of lines), then they were buried by the recent 10-14" of snow (steep increase at end of graph). Image: GNFAC

Northern Gallatin, 2018-11-25

Skiers saw this natural avalanche near Mt. Blackmore on Saturday (11/24). Almost a foot of new snow fell and buried weak snow that formed on the surface of the snowpack during cold and dry weather. Be cautious of avalanches breaking at this weak interface for a few days and with the next storm. Photo: M. Staples

Link to Avalanche Details
Northern Gallatin, 2018-11-23

Wind is moving snow creating wind slabs on the east face of Blackmore up Hyalite. This avalanche was seen on Thanksgiving. More snow and wind will create more wind drifting and more avalanches. Photo: B. VandenBos

Link to Avalanche Details
Cooke City, 2018-11-21

A layer of surface hoar is on many slopes in Cooke City. These feathery crystals can be unstable when buried. We will be keeping an eye on them with the approaching storm. Photo: GNFAC

Cooke City, 2018-11-21

Alex Marienthal stands by the Lulu Pass weather station outside Cooke City. We put it up today and you can view the hourly data HERE.Photo: GNFAC

Cooke City, 2018-11-21

The surface snow is feathery crystals of surface hoar and small facets. These crystals are weak and will become unstable once buried. Today's snow surface may be tomorrow's problem. Photo: GNFAC