Bridger Range

Riding in this morning, we saw this older wet slide on the Portal Creek road down low at about 6400' in elevation on a south facing slope by lots of exposed rocks. For reference, Gallatin River is 5800' in this area.

We didn't see any fresh ones on our way out at about 2:30. 

The most likely places for big wet slides are slopes or areas with exposed rocks and cliffs. Generally these wet slides happen a little predictably in the afternoon as the snow gets wet. We know what time of day they'll happen, but it's hard to know exactly when they'll release, so watch out when the snow is obviously wet if traveling under slopes like this. 
 

You don't need to worry about them in the morning, when the snow is frozen. What a nasty avalanche with sticks, rocks, and dirt in it?

We toured out north of Bridger Bowl and onto the west side of the range, searching for shallow snow and reactive buried weak layers.

While we did find shallower, weaker snow compared to what we've seen on the east side, it is remarkably deep back there! There is close to 5 feet of snow at around 7200'. What was mainly present were layers of weak, faceted snow that formed during the high pressure at the end of January. These were capped with a slab of newer, dense snow. This slab and weak layer combo gave us ECTN's in all our snowpits. An atypical amount of snow exists in this zone, and while an avalanche breaking on this persistent weak layer is unlikely, there may be isolated areas where you may be able to trigger a small avalanche breaking at this interface. 

Apart from looking for weak layers, we were nearly blown off our feet a few times by strong westerly winds. There was significant snow transport occurring at upper elevations and ridgelines. Our ski tracks and snowpit were almost entirely blown in on our return back to Bridger, and we were able to trigger cracking in small, newly-formed wind slabs. With a few more inches of snow forecasted tonight, and continued winds tomorrow, our primary concern will be wind slab avalanches breaking in the upper 1-2' of the snowpack. 

Outside of wind-loaded terrain, natural and human-triggered avalanches are unlikely on non-wind-loaded slopes in the Bridgers. 

From obs.: "Saw a recent cornice triggered wind slab off of Hardscrabble Peak, crown looked fairly fresh. There was a second crown line below the rock band. Conditions were very windy, with snow still being transported. Most snow surfaces were wind affected, but saw no cracking or collapsing." Photo: F. Miller