Glacier National Park Avalanche Forecast
Issued: Nov 21st, 2021 4:00PM
The alpine rating is Wind Slabs., the treeline rating is , and the below treeline rating is Known problems include
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.
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.
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.
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.
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.
Valid until: Nov 22nd, 2021 4:00PM
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