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Avalanche Forecast

Archived

Mar 21st, 2015–Mar 22nd, 2015

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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Transitional or shallow terrain will be hidden under the new snow. Check your speed and have fun with the first spring snowfall.

Weather Forecast

All models seem to agree, winter is not completely over in the higher elevations. Continued inputs will bring aprox. 10cm overnight and continue into the early week. Freezing levels will remain high so it will be important to get above 2000ms to find the best turns.

Snowpack Summary

New snow overlying crusts exist up to 2200m on all aspects and extend higher on solar aspects. Above treeline, wind slabs up to 65cm thick can be found in isolated locations. Bonding of these slabs is good however a graupel and facet layer has moderate shear tests. Deeper weaknesses can be found near the base of the snowpack.

Avalanche Summary

No new avalanches reported.

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.

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.