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Avalanche Forecast

Archived

Feb 19th, 2020–Feb 20th, 2020

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

Regions

Jasper.

Sunny ways my friends, Sunny ways!

Strong (dare I say, spring like) solar effect through the region. Some surface changes expected but it will take a few days to penetrate deeper into the cold snowpack. 

Weather Forecast

Fair weather is here. An upper ridge of high pressure will prevail today giving way to a more zonal flow over the province Thursday. The will bring a series of frontal systems to northern BC through the day Thursday.

Find the Alberta Rockies weather synopsis here: Mountain Weather Forecast

Snowpack Summary

Variable strength windslab on most surfaces TL and above. Some solar effect on steep South aspects. Pronounced cornice development on northerly aspects and cross loaded features treeline and above. The mid-pack is bridging the deeper basal facets and depth hoar in some locations.

Average HS at treeline: ~180cm.

Avalanche Summary

No new avalanches reported from field teams in the Icefields.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.