Glacier National Park Avalanche Forecast

Issued: Nov 21st, 2021 4:00PM

Sun Nov 21st Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Mon Nov 22nd 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Tue Nov 23rd 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Wind slabs are likely forming in the alpine, evaluate steep terrain and convex areas with caution.

Travel below ~1700m is teeth chattering and rugged due to a breakable crust and refrozen chunks of snow, take your time moving through this terrain.

Summary

Weather Forecast

Monday will see a mix of sun and cloud with scattered flurries throughout the forecast region with accumulations up to 5cm over the afternoon and another 10cm overnight into Tuesday. Winds will be 30-50km/hr from the SW and the freezing level will remain at valley bottom with an Alpine high of -5. Winds are forecasted to drop on Tuesday morning.

Snowpack Summary

Up to 30cm of low density snow has fallen in the past 48 hours and is being redistributed by 30-50km/hr Southerly winds. At tree line the new snow covers the widespread November 15th crust. Below ~1700m a breakable crust and refrozen snow/ice chunks make for poor travel. The November 5th crust is decomposing near the bottom 1/3rd of the snowpack.

Avalanche Summary

No new natural avalanches have been observed or reported in the past 4 days. Several small size 1 skier triggered avalanches, soft slabs, have been reported from backcountry skiers/riders. The Howitzers were registered on Thursday, firing artillery at very steep terrain in the highway corridor with little to no result.

Confidence

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2

With 20-30cm of new snow available for transport and 30-50km/hr Southerly winds, expect wind slab formation at ridge crests and on cross loaded features. Approach these areas with caution.

  • Use caution in lee and cross-loaded terrain near ridge crests.
  • Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Nov 22nd, 2021 4:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.