Cornice triggered slab near Big Sky
From BSSP: "...observed a D2.5 avalanche on the NE face of Fan Mtn. that looks to be a bout a 2’ crown likely triggered by cornice fall."
From BSSP: "...observed a D2.5 avalanche on the NE face of Fan Mtn. that looks to be a bout a 2’ crown likely triggered by cornice fall."
Low angle metal roofs have heavy, thick slabs of snow that built up during persistent cold temperatures. These slabs will slide during warm temperatures. Be on the lookout for overhead hazard and be cautious where you walk or park your car during warm sunny days. An additional urban hazard are large icicles are that will break during warm days. Photo: A. Schauer
A group of snowmobilers reported seeing another group trigger this avalanche on Friday afternoon. Nobody was caught.
This slide was triggered by a snowmobiler on Saturday (3/16) south of Virginia City. Photo: J. Hagar
<p>Small wet loose avalanches are possible on sunny slopes this afternoon. Otherwise, the snowpack is generally stable and avalanches are unlikely. Slopes that receive direct sun have a thick frozen crust which makes them stable this morning. Today, warm temperatures and sun will melt this crust and the snow surface will become unstable. Anticipate decreasing stability on sunny slopes. Move to shadier slopes or lower angle terrain if the snow surface becomes moist, or if you see roller balls or natural point release slides. Today wet loose slides will not be large enough to bury a person, but are dangerous if they knock you down or carry you through trees or over rocks.</p>
<p>The last couple days temperatures reached the high 30s F, yet snow remained dry on shady slopes and there were generally few wet loose slides (<strong><a href="https://www.mtavalanche.com/node/20408">photos</a></strong>). Similar weather today will create similar conditions. On Friday we went to Mt. Blackmore and yesterday to the northern Bridger Range. In both places we found a generally stable snowpack aside from small loose snow avalanches (<u><strong><a href="https://www.mtavalanche.com/images/19/skier-triggered-dry-loose-avalanc…;, <strong><a href="https://www.mtavalanche.com/images/19/wet-loose-slides-near-fairy-lake"…;). Near Fairy Lake we saw old wind slab crowns that show the type of terrain where there is an isolated chance to trigger one of these, and we saw small slides in terrain with high consequences (<strong><a href="https://www.youtube.com/watch?v=htNwM_uyA44&list=PLXu5151nmAvRNl9ku…;). Without a recent loading event, avalanches failing deeper in the snowpack are unlikely (<u><strong><a href="https://www.youtube.com/watch?v=zDZIGxGxCgY&list=PLXu5151nmAvRNl9ku…;
<p>Today the snowpack is generally stable aside from small loose snow avalanches, and avalanche danger is rated LOW. If you travel into steep terrain, remain cautious and carefully assess the snowpack and consequences of being caught in a slide.</p>
<p>If you get out and have any avalanche or snowpack observations to share, contact us via our <u><a href="https://www.mtavalanche.com/node/add/snow_observation">website</a></u>, email (<u><a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a></u>), phone (406-587-6984), or Instagram (#gnfacobs).</p>
"A few small wet loose releases were observed in areas without skier traffic but were confined to the top couple of inches on top of our previous high pressure surface. The attached pic is the largest of those wet loose results and was a size 1 in Buffer Chute, in the Upper A-Z’s and occurred after that terrain had closed for the day." Photo: BSSP
On Saturday (3/16) in the northern Bridger Range we saw natural and skier triggered wet loose slides that were small, but could have severe consequences if they catch you in unforgiving terrain. Photo: GNFAC
We saw old wind slab crowns near Fairy Lake on Saturday (3/16). These types of slides are now unlikely to trigger, but worth keeping in mind in steep heavily wind loaded terrain. Photo: GNFAC
We saw old wind slab crowns near Fairy Lake on Saturday (3/16). These types of slides are now unlikely to trigger, but worth keeping in mind in steep heavily wind loaded terrain. Photo: GNFAC
We saw natural and skier triggered wet loose avalanches near Fairy Lake. Big Sky Ski Patrol saw a few small natural wet loose slides in closed terrain.