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Avalanche Forecast

Archived

Dec 1st, 2020–Dec 2nd, 2020

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

Regions

Glacier.

Weather Forecast

Freezing levels over southern BC are forecast to rise from 1500m to 3000m today, depending on which model you believe. Expect sunny skies today, no precipitation and light winds. If the warming does not occur today, grab your sun screen, because all the models agree it will heat up tomorrow with the FL rising to 3400m!

Snowpack Summary

5-10cm of new snow, and mod-strong winds have hidden a layer of surface hoar size 5-10mm in most sheltered areas of the park. Beneath this interface are old wind slabs in the Alpine and exposed areas of treeline. In sheltered areas around TL there is another buried layer of SH dwn 40-60-cm. The Nov 5th Cr is now buried over 1m down

Avalanche Summary

No new avalanches were observed in the HWY corridor yesterday, or reported from the backcountry. An avalanche reported on Mt Swanzy appears to have stepped down to the Nov. 5th weak layer. A skier triggered sz 1.5 in Avalanche Crest and a 2.5 in Quartz last week failed on surface hoar with wide propagation.

Confidence

Intensity of incoming weather systems 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.

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.

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.