Photos From the Field

Hourglass Avalanche Hourglass Avalanche -Apr 16, 2014

From an email:

Observed a large crown in the hourglass while touring on Monday, April 14. The slide appeared to be a day or two old. We believe it was triggered by a cornice falling, looked like it broke 1-3 feet deep, and about 100 feet across. The slide went on almost a directly east facing aspect, and took out a large portion of the center of the chute. It slid through the choke, and down the apron, where in one place it stepped down to the ground level and exposed an area of rock about 20x20 ft. The debris ran the full path, well into the small saplings at the base of the chute. I wanted to get a picture and measure the depth of the debris, but temperatures were warming rapidly and I wasn't totally comfortable with the hangfire still near the crown.

Photo: J. Moss

Season Summary Banner Season Summary Banner -Apr 15, 2014
Northern Bridgers Graupel Northern Bridgers Graupel -Apr 4, 2014

Graupel is like hail. When buried it is a temporary weak layer but tends to bond fairly in a day or two. It tends to roll down hill and pool on aprons and cones. From April 3 north of Frazier Basin: "We felt like someone could have triggered fresh wind slabs in places, especially where the graupel had pooled to a dramatic degree.  Other than that the surface snow looked and felt pretty good." Photos: B. Fredlund

Surface Hoar Beehive/Bear/Middle Basins Surface Hoar Beehive/Bear/Middle Basins -Apr 4, 2014

"The surface hoar grains were about .5-.8cm, and didn’t seem to be distributed too far down the slope into bear, maybe 2-300 vert max. The heat and solar from Tuesday broke it down lower in the valley. And it was pretty much gone on S facing aspects as we went back to the truck." Photo: L. Zukiewicz

Recent avalanche near Cooke City Recent avalanche near Cooke City -Apr 2, 2014

A skier triggered an avalanche in the new snow on Sunday, March 31st.  This is a mid elevation slope near Woody Ridge south of Cooke City. Photo: B. Fredlund

Beehive/Middle Basin Avalanche Beehive/Middle Basin Avalanche -Apr 1, 2014

Skiers got surprised when this slab pulled out yesterday.  No one was caught or injured.  New snow and some wind-loading created instability that luckiy did not step down to deeper layers. Photo: Anonymous

New snow avalanche Mt Backmore - 3/29/14 New snow avalanche Mt Backmore - 3/29/14 -Mar 30, 2014

This small wind slab near Mt Backmore in the northern Gallain Range was human triggered. Althoug small, it's an obvious sign of instability. This type of slide would be far more hazardous in steep, high consequence terran. Photo D Nicolls 

Large Natural Avalanche Mt Blackmore - 3/29/14 Large Natural Avalanche Mt Blackmore - 3/29/14 -Mar 29, 2014

This natural avalanche occurred on the north face of Mt Backmore. Heavy wind loading and weak facets near the ground was the recipe that caused this slide. The crown in the lookers left side of the photo is nearly seven feet deep. Avalanches of this nature will become more likely as more weight and stress is added to the snowpack. Photo B Bakken 

Jones Creek Avalanche Debris Jones Creek Avalanche Debris -Mar 27, 2014

At least 7 avalanches were seen yesterday (3/26) on SW aspects in the Jones Creek area on the west side of the Bridger Range. All were several days old. Three of them stepped down into wet snow and created large debris piles. Photo: A. Whitmore

Hourglass, northern Bridger Range Hourglass, northern Bridger Range -Mar 24, 2014

The circle shows my pit location on a south-facing slope.  We did not ski this slope because my stability tests were inconclusive on a layer of depth hoar found one foot off the ground. I do not trust this layer and try to avoid areas where thin, rockier terrain underlies the snowpack, which this slope has. Photo: GNFAC