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Avalanche Forecast

Archived

Jan 16th, 2021–Jan 17th, 2021

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

Regions

Jasper.

Avoid the alpine entirely as well as treeline features with wind effect and overhead hazard. The safest and best skiing will be found in sheltered locations.

Weather Forecast

Sunday: Cloudy with sunny periods and isolated flurries. Low -11, High -7. Wind W: 20 km/h gusting to 55 km/h.

Monday: A mix of sun and cloud. Low -14 C, High -9 C. Mostly light ridge wind occasionally gusting to 35 km/h.

Tuesday: Cloudy with sunny periods and isolated flurries. Low -14 °C, High -9 °C. Ridge wind west: 20-40 km/h.

Snowpack Summary

Jan 13th brought upwards of 55cm of new snow to the region and it continues to settle with mild temperatures. The alpine and wind prone treeline has had and will continue to have strong winds promoting wind effect, wind slab formation and cornice growth. The midpack is supportive. Near the ground it is weak facets and depth hoar.

Avalanche Summary

Several size 1 wind slab avalanches from the last 24 hours out steep alpine terrain were observed on road patrol on highway 93N today. No other avalanches observed.

Share your trip info at Mountain Information Network .

Confidence

Wind speed and direction is uncertain on Tuesday

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.