20-21

From obs (4/18/21): "...class split and dug three pits, one on NE, one on N, and one on NW at 7623'. HS averaged around 70 - 100 cms... The NE and NW facing pits showed rounding depth hoar and no sudden CT results. None of the ECTs fractured or propagated. The N facing slope still had preserved advanced depth hoar 3 mm in size (see image)..." Photo: J. Quinn

Northern Madison, 2021-04-18

From obs (4/18/21): "...class split and dug three pits, one on NE, one on N, and one on NW at 7623'. HS averaged around 70 - 100 cms... The NE and NW facing pits showed rounding depth hoar and no sudden CT results. None of the ECTs fractured or propagated. The N facing slope still had preserved advanced depth hoar 3 mm in size (see image)..." Photo: J. Quinn

Northern Madison, 2021-04-18

GNFAC Avalanche Forecast for Fri Apr 16, 2021

Snowpack and Avalanche Discussion

<p>This weekend we’ll see pretty much the whole range of spring weather. Sun, clouds, shifting winds, temperatures above and below freezing, maybe rain, and then snow to cap it all off. While conditions are generally stable and avalanches are unlikely in the lower snowpack, this variable weather means that there are a number of different, relatively minor, hazards to watch out for.&nbsp;</p>

<p>Unusual easterly winds have drifted the little bit of recent snow into cohesive slabs on slopes that don’t normally have wind drifts. Skiers in the northern Bridger Range yesterday found some small wind drifts that cracked along their skintrack (<a href="https://www.mtavalanche.com/images/21/wind-drifts-near-flathead-pass"><…;). Assess these drifts before committing to steep slopes.&nbsp;</p>

<p>With temperatures rising above freezing and sunny skies, expect small, loose wet avalanches. These slides will only involve the new snow or the top couple inches of the snowpack as crusts break down. The major hazard posed by these slides is getting knocked off your feet and into rocks or off a cliff. Watch for the snow surface getting wet and rollerballs as warning signs that conditions for loose wet avalanches are developing.&nbsp;</p>

<p>Right now, precipitation is forecasted to begin Sunday evening. If snow starts a bit earlier than expected, watch out for small avalanches in fresh wind drifts on Sunday afternoon. If it rains more than a drizzle, avoid steep slopes as the snowpack may rapidly destabilize.&nbsp;</p>

<p>Continue to follow the same safe travel protocols as in the winter: ski or ride with a partner; always carry a beacon, shovel, and probe; and go one at a time on steep slopes.&nbsp;</p>

<p>We will issue spring snowpack and weather updates each Monday and Friday through April, or as needed, and we will share relevant avalanche and snowpack information on our website and social media. If you get out, please send us your observations no matter how brief. You can submit them via our <a href="https://www.mtavalanche.com/node/add/snow_observation"><strong><u>websi…;, email (<a href="mailto:mtavalanche@gmail.com"><strong><u>mtavalanche@gmail.com</u></str…;), phone (406-587-6984), or Instagram (#gnfacobs).</p>

Announcements, Avalanche Education and Events

Bridger Bowl is closed, and backcountry conditions exist (video). There is no avalanche mitigation or ski patrol rescue. Please stay clear of work areas, snowmobiles, chair lifts and other equipment. 


See our education calendar for an up-to-date list of all local classes.