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Avalanche Forecast

Archived

Jan 21st, 2019–Jan 22nd, 2019

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

Regions

Jasper.

Good skiing can be found in sheltered areas treeline and below.

Weather Forecast

Expecting a steady pattern in the weather for the next two days; cloudy with some sunny periods. Little precipitation and temperatures between -10C to -3C. Light west to SW winds, with moderate gusts from the SW.  Starting Wednesday 13mm of precip forecasted with moderate wind.A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

New wind slab in the alpine can be expected at ridge tops and immediate lees. 10cm of new, low density snow overlies a mix of old surfaces (facets and/or surface hoar and sun crust). This, over a generally strong mid-pack sitting on the deep persistent weaknesses of facets and depth-hoar.  Thin sun crust on steep due south.

Avalanche Summary

No new avalanches reported. Areas of concern are where overhead cornices threaten unevenly distributed snowpack areas. (where deep basal weakness may exist). Be a part of the Avalanche Forecasting team by reporting your field trip this weekend on Avalanche Canada's Mountain Information Network.

Confidence

Timing of incoming weather systems is uncertain on Wednesday

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.