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Avalanche Forecast

Archived

Dec 2nd, 2020–Dec 3rd, 2020

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

Regions

Jasper.

A strong alpine temperature inversion with solar influence on Wednesday may have had some impact on the snowpack creating a crust on the lower alpine and upper treeline elevations.

Weather Forecast

Thursday: Cloudy with sunny periods. Alpine temperature: High -1 °C. Wind SW: 10 km/h. Freezing level: 1700m.

Friday: Cloudy with sunny periods. Alpine temperature: Low -8 , High -1 Wind SW: 15 km/h. Freezing level: 1500m.

Saturday: A mix of sun and cloud. Alpine temperature: Low -4 °C, High -1 °C. Wind SW: 15 km/h. Freezing level: 1800m.

Snowpack Summary

Previous winds have stripped the snow from all fetch in the alpine and open tree line. Soft snow can still be found in specific sheltered locations at tree line and below. Snow depth at tree line is around 80cm with the Nov 4 crust down 50cm. The snowpack is supportive to skis. Suspect crust from the inversion on solar at treeline and lower alpine.

Avalanche Summary

No new avalanches observed or reported in the region. No field observations or 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.