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Avalanche Forecast

Archived

Feb 25th, 2022–Feb 26th, 2022

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, 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.

Winds changing to southerly and increasing in strength on Saturday. Main concern is wind slab in the Alpine and open Treeline; may see an increase in sensitivity with additional load on Sunday.

Weather Forecast

Saturday: Isolated flurries with trace. Alpine High -8 C. Ridge wind SW 15-25 km/h. Freezing level valley bottom.

Sunday: Flurries 10cm. Alpine Low -10 C; High -6 C. Ridge wind SW 20 gust 55 km/h. Freezing level 1400m.

Monday: Scattered flurries 5cm. Alpine Low -11 C; High -3 C. Ridge wind SW 10-20 km/h. Freezing level valley bottom.

Snowpack Summary

10-15cm from last weekend has been redistributed by northerly winds causing reverse loading in many locations with wind slab development in Alpine and exposed terrain at tree line. A weak temperature crust present up to 1900m on all aspects with a sun crust on solar aspects up to 2800m. Basal facets & depth hoar found throughout the forecast area.

Avalanche Summary

A few natural size 1 dry loose avalanches observed and reported through the MIN on the Icefields Parkway Tuesday and Wednesday - most occurring in steep terrain.  No patrol today.

Confidence

Forecast snowfall amounts are 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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.