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Avalanche Forecast

Archived

Jan 30th, 2021–Jan 31st, 2021

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

Regions

Jasper.

Eventually all green bricks must come to an end.  Plan on the hazard elevating with the increased winds and new snow starting Sunday afternoon and continuing into next week

Weather Forecast

Sunday: Flurries. Accumulation: 9 cm. Alpine temperature: High -4 °C. Ridge wind south: 15-35 km/h. Freezing level: 1600 metres.

Monday: Periods of snow. Accumulation: 18 cm. Alpine temperature: Low -6 °C, High -3 °C. Ridge wind south: 15 km/h gusting to 40 km/h.

Tuesday: Flurries. Accumulation: 6 cm. High -5 °C. wind occasionally gusting to 35 km/h.

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 Monday

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.