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Avalanche Forecast

Archived

Feb 4th, 2022–Feb 5th, 2022

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

Regions

Jasper.

Strong southwesterly winds combined with new snow on Friday night will contribute to wind slab development.Good skiing can still be found in sheltered areas below tree line.

Weather Forecast

Saturday: Precipitation: Trace. Alpine temp: High -8 °C. Wind west: 20 km/h gusting to 55 km/h. Freezing level at VB.

Sunday: Precipitation: Trace. Alpine temp: Low -12 °C, High -6 °C. Wind west: 20-40 km/h. Freezing level: 1400 metres.

Monday: Flurries. Accumulation: 7 cm. Alpine temp: Low -13 °C, High -8 °C. Wind west: 25 km/h gusting to 80 km/h.

Snowpack Summary

Varied wind effect at tree line and above. Snowpack is facetted and complex. December facet layers down 20-40cm still reactive in tests; buried surface hoar found in isolated locations.

Avalanche Summary

No new avalanches reported from road patrol today.

Confidence

Due to the number of field observations

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.