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Avalanche Forecast

Archived

Mar 21st, 2021–Mar 22nd, 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.

Alpine and tree line have turned back to winter land with great turns to be had.Recently formed wind slabs are of most concern, particularly where sun crust from the last few days is present.

Weather Forecast

Monday: Mainly cloudy with scattered flurries. Accumulation: 4 cm. Alpine temperature: High -7 °C. Ridge wind northwest: 10-25 km/h. Freezing level at valley bottom.Tuesday: Cloudy with sunny periods and isolated flurries.Trace. Alpine temperature:  High -8 °C. Ridge wind west: 15 km/h gusting to 40 km/h. Freezing level at valley bottom.

Snowpack Summary

Up to 20cm new from convective flurries over past couple days redistributed by SW winds TL/ALP, overlies a variety of sun crusts and moist snow on solar aspects up to ALP. The overall snowpack is variable at TL and above with a supportive strong 1F to P midpack in the deeper areas to a weak facetted midpack in shallow areas.

Avalanche Summary

Patrol in the Icefields area observed couple sz 1 wind slab avalanches in ALP wind loaded features. There have been reports of sporadic large avalanches in isolated ALP features in the last couple weeks believed to be triggered by large cornice load.

Confidence

Problems

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.

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.