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Avalanche Forecast

Archived

Nov 21st, 2021–Nov 22nd, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

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.

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

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.