19-20
From obs (4/26/20): "....a wet slide from a n-ne couloir up mission creek near elephant head in the absarokas between 10-11:30 this morning. Snow did not freeze over last night and was heavily saturated early this morning before the sun rose." Photo: @laura_delray
Forecast link: GNFAC Avalanche Forecast for Mon Apr 27, 2020GNFAC Avalanche Forecast for Sat May 2, 2020
"Skied up a BB this morning [4/25/20] and noticed the glide crack below the north end of Bridger Gully is opening up." Photo: M. Lavery
GNFAC Avalanche Forecast for Fri Apr 24, 2020
<p>A couple inches of new snow combined with moderate winds means you’ll want to look out for wind drifts today, particularly on higher elevation slopes near ridgelines. You can trigger an avalanche in dry snow this morning or as the temperature rises and the new snow becomes wet. At low elevations the snowpack is already wet this morning. With above freezing temperatures each day, the snowpack will loose strength as the snow surface melts. The strong late April sun will accelerate the melting once it pops out.</p>
<p>Wet snow avalanches are the primary concern through the weekend. Widespread small wet loose avalanches were seen across the Bridger Range and around Big Sky this week with some slides breaking larger as well (<strong><a href="https://www.mtavalanche.com/images/20/wet-loose-frazier">photo</a></str…;, <strong><a href="https://www.mtavalanche.com/images/20/wet-snow-bear-basin">photo</a></s…;, <strong><a href="https://www.mtavalanche.com/images/20/wet-slide-bridger">photo</a></str…;). Similar slides will be easily triggered as the new snow gets wet for the first time.</p>
<p>Destructive wet slabs are also a possibility as meltwater drains deeper into the snowpack, particularly if we end up seeing more than a sprinkling of rain at upper elevations.</p>
<p>Wet snow can’t be trusted. If you’re sinking deeper than your ankles into unconsolidated slush, avoid steep slopes. </p>
<p>Read <a href="https://www.mtavalanche.com/sites/default/files/2020-04/GNFAC%2019-20%2… season’s snowpack summary</strong></a><strong> </strong>for a review of the poor snowpack structure that could still produce big wet slabs.</p>
<p>Please continue to send us your observations. You can fill out an observation form, email us (mtavalanche@gmail.com), leave a VM at 406-587-6984, or Instagram (#gnfacobs). We greatly appreciate your support.</p>
Give Big Gallatin Valley
Give Big Gallatin Valley is April 30th - May 1st. The Friends of the Avalanche Center are participating again this year and want to thank all of you for your support.
Wet slide at Bridger Bowl on Wednesday, 4/22/2020. Photo: K. O'leary
Forecast link: GNFAC Avalanche Forecast for Fri Apr 24, 2020GNFAC Avalanche Forecast for Mon Apr 27, 2020
Many wet loose avalanches in Beehive/Bear Basins
From obs (4/22/2020): "Early this morning we ascended near peak 10467 between Beehive and Bear Basin and skied a line off the south-east ridge. We noticed an old wet slide (a day or so) at the exit of the couloir we skied, and many more slides, point releases and large pinwheels off of south-east aspects of peak 10467 and on the saddle between peak 10467 and 10390. These all appeared to be from yesterday or the day before yesterday. On the north-east aspects there was an approximately 6" wind crust on top of a relatively isothermic upper layer (did not dig deep enough to see if it was isothermic throughout) that started melting rapidly once the sun hit it."