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Avalanche Forecast

Archived

Feb 15th, 2022–Feb 16th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Incremental new snow and variable winds building new wind slab Alpine and Treeline.

Weather Forecast

Wednesday: Variable cloud. Alpine high -9 C. Wind west 15-30 km/hr. Freezing level valley bottom.

Thursday: Flurries up to 6cm.  Alpine low -12 C high -7 C. Wind west 20 gust 45 km/hr. Freezing level valley bottom.

Friday: Scattered flurries up to 5cm. Alpine low -8 C high -6 C. Freezing level 1600m.

Snowpack Summary

Trace to 15cm new snow across the bulletin region accompanied by moderate NW and now SW winds building slab immediate lees in the alpine and exposed tree line. New snow burying weak temperature crust up to 1900m and solar crust on solar aspects up to 2800m. Dec Facets down 20-70cm. Basal faceting & depth hoar widespread throughout area.

Avalanche Summary

No new avalanche activity observed or reported from road patrol or field team in Fryatt Valley Monday or Tuesday.  New wind slab on buried temperature/solar crust is main concern.

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.

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.