Snowpack and Avalanche Discussion
<p>In the last 2 days the northern mountains received 18” around Big Sky and 9-12” everywhere else measuring around 1” <u><a href="https://www.mtavalanche.com/taxonomy/term/451">snow water equivalent</a></u> (SWE). There have been avalanches in the new snow. Yesterday in the Bridger Range skiers noted small slides breaking within the new snow (<strong><a href="https://www.mtavalanche.com/images/20/thin-slabs-breaking-naturally2">p…;) and on the ice crust which underlies this week’s accumulation. Also, near Hyalite Peak, skiers saw debris from a small natural avalanche that broke 12” deep in the new snow.</p>
<p>The new snow is sitting on an ice crust on many aspects and elevations. As Dave and I discovered during our tour at Bridger Bowl on Tuesday, avalanches could be triggered on this crust (<strong><a href="https://youtu.be/S_hEBqY67-g">video</a></strong>). This will become especially problematic as skies clear and strong sunshine dampens the snow and triggers many loose, wet, point release avalanches that will slide far on this hard layer. Be extra careful about triggering slides if people are below you. No matter if you are on a sled or skis avoid avalanche terrain once the new snow gets wet.</p>
<p>The avalanche danger is rated MODERATE on all slopes this morning, but will rise to CONSIDERABLE for wet avalanches by this afternoon on slopes getting direct sunshine.</p>
<p>In the southern ranges, Cooke City has gotten 15” in the last 48 hours while 8-9” fell around West Yellowstone and Taylor Fork (.6-1” SWE). An ice crust of varying thickness underlies the new snow on many slopes. Avalanches are possible on this crust, no matter if they are new snow slides, slabs from wind-loading, or wet snow. Concentrate your stability assessment on the upper 2 feet of the snowpack, crust or not, since this is where instability will be found. Dave and I made a <strong><a href="https://youtu.be/S_hEBqY67-g">video</a></strong> during our tour in the Bridger Range that is also applicable to the southern mountains.</p>
<p>Skies are forecasted to be partly cloudy with mountain temperatures reaching the low 30s. This will help keep wet avalanche activity from becoming widespread. The snow will dampen with direct sunshine and skiers and sledders should be on the lookout for pinwheels in the new snow, a sign that the surface is getting wet enough to avalanche.</p>
<p>Given the new snow, underlying crusts and potential for a few wet avalanches, the danger is rated MODERATE on all slopes.</p>
<p>We will end daily avalanche forecasts on Sunday, April 5<sup>th</sup> and continue with general bulletins every Monday and Friday through April. Over the next couple of weeks, we will take down weather stations and will no longer receive observations from guides and ski patrol. We need help gathering field data. Please send us your observations no matter how brief. You can fill out an <u><a href="https://mtavalanche.us17.list-manage.com/track/click?u=6653a830e4819c9e…; target="_blank">observation form</a></u>, email us (<u><a href="mailto:mtavalanche@gmail.com" target="_blank">mtavalanche@gmail.com</a></u>), leave a VM at 406-587-6984, or Instagram (#gnfacobs).</p>
COVID-19 Info and Updates
This Montana map is updated with the latest infection and fatality numbers every 8 a.m. and 4:30 p.m.
