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Avalanche Forecast

Archived

Dec 7th, 2020–Dec 8th, 2020

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

Regions

Jasper.

The storm continues with up to 30cm in the forecast. Expect rolling closures on Hwy 93 for avalanche control.

The new snow is welcome but conditions are perfect for sensitive wind slabs to develop in exposed terrain.

Weather Forecast

The tail of a strong Pacific frontal system will bring moderate precipitation (up to 25mm) overnight through tomorrow morning accompanied by moderate to strong ridge top winds from the southwest. A cooling trend is expected Wednesday.

Snowpack Summary

5cm new snow today with strong SW ridge winds burying a variety of surfaces including facets and isolated surface hoar TL and BTL, hard slab in the alpine and open TL, and solar crust on steep solar. Snow depth at tree line is up to 95cm with the Nov 4 crust down 50cm. Basal weakness continue to develop. An additional 25cm is expected overnight.

Avalanche Summary

No avalanches observed or reported today. No road patrols today. Expecting an avalanche cycle tomorrow with the up to 30mm in the forecast overnight.

Confidence

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.