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Avalanche Forecast

Archived

Mar 31st, 2021–Apr 1st, 2021

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

Regions

Jasper.

Freezing levels are expected to rise on Thursday. Be aware of overhead hazards, specifically steep, rocky solar terrain.

Weather Forecast

Cloudy with flurries and moderate SW winds on Thursday and Friday. Forecasts for freezing levels vary, but could be up to 2000m on Thursday.

Snowpack Summary

The most recent storm snow is being redistributed by moderate winds, forming wind slabs in the ALP and TL. Warm daytime temps and overnight freezing will result in moist surface snow and crusts BTL. The HS is highly variable throughout the region with a strong supportive midpack in deeper areas and a weak unsupportive midpack in shallow areas.

Avalanche Summary

No new avalanches observed from today. Wind slabs and loose dry avalanches that resulted from Sunday's storm are evident, but this natural activity occurred during the storm and on Monday.

Confidence

Intensity of incoming weather systems is uncertain

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.