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Avalanche Forecast

Archived

Jan 18th, 2021–Jan 19th, 2021

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

Regions

Jasper.

Great skiing can sill be found in sheltered areas. Avoid wind effected terrain for both safety, and quality.

Weather Forecast

Tuesday: Cloudy with sunny periods and isolated flurries. High -8 C. Ridge wind west: 25-65 km/h.

Wednesday: Cloudy with sunny periods and isolated flurries. Low -15 C, High -10 C. Wind west: 15 km/h gusting to 45 km/h.

Snowpack Summary

30cm of unconsolidated surface snow continues to settle. The alpine and wind prone tree line areas have seen a lot of moderate to strong winds promoting wind effect, wind slab formation and cornice growth. The midpack is supportive. Spotty buried surface hoar can be found down 30cm and 70cm in sheltered and shaded locations below treeline

Avalanche Summary

No new avalanches observed on field patrol Sunday, but significant whoomphing was observed in low angle wind effected terrain.

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Confidence

Due to the quality 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.