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Avalanche Forecast

Archived

Jan 29th, 2021–Jan 30th, 2021

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

Regions

Jasper.

New snow and increased winds expected Saturday evening and Sunday. The more snow, the greater the hazard

Weather Forecast

Sat: Cloudy with sunny periods and isolated flurries. Precipitation: Trace. Alpine temperature: High -9 °C. Ridge wind southwest: 15 km/h gusting to 40 km/h.

Sun: Flurries. Accumulation: 12 cm. Alpine temperature: Low -9 °C, High -6 °C. Ridge wind southwest: 15-35 km/h. Freezing level: 1500 metres.

Snowpack Summary

Alpine is either stripped of snow completely or offers a variety of wind affected surfaces. Surface faceting continues with cooler temperatures. Strong mid-pack overlies generally supportive basal layers. Decomposing surface hoar is found down 40cm to 80cm in isolated sheltered locations, in the very southern parts of the park.

Avalanche Summary

Field team reports no new avalanche activity observed.

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Confidence

Intensity of incoming weather systems is uncertain on Sunday

Problems

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.