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Avalanche Forecast

Archived

Jan 8th, 2022–Jan 9th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Strong to extreme winds expected to build hard slabs and scour the alpine in the next few days.Jasper has not received as much precipitation as its neighbors, hence a lower hazard rating.

Weather Forecast

Sunday: Precipitation: Trace. Alpine temperature: High -9 °C. Ridge wind southwest: 20 km/h. Monday: A mix of sun and cloud. Precipitation: Nil. Alpine temperature: Low -10 °C, High -9 °C. Ridge wind southwest: 20 km/h. Tuesday: Flurries. Accumulation: 9 cm. Alpine temperature: Low -10 °C, High -7 °C. Ridge wind southwest: 20-30 km/h.

Snowpack Summary

2-10cm of new snow with M-S south winds at ridge top. Cold temperatures faceting the snowpack. Supportive 4F-1F mid-pack in most areas, shallow areas becoming punchy. Dec 1st interface down close to 40cm, which has questionable reactivity below 1900m. Basal faceting continues near or on the ground.

Avalanche Summary

No new avalanches observed or reported today.

Confidence

Wind speed and direction 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.