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Avalanche Forecast

Archived

Feb 3rd, 2013–Feb 4th, 2013

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

Regions

Little Yoho.

Warm temps are promoting the failure of cornices throughout the forecast region. Although they have not been triggering avalanches, they can still be problematic if you are parked underneath them. Some chunks are running quite far.

Weather Forecast

A system is moving towards the forecast region. Between tonight and Tuesday expect light accumulations and moderate wind. By Wednesday the storm will intensify and deliver up to 20mm of precip. Expect a steady rise in the danger ratings over the next few days. The temperatures will range between -9 and -15 at 3000m.

Snowpack Summary

Fresh wind slabs of variable thickness sit on top of a faceted snowpack. Expect a weaker and more faceted snowpack in areas with  < 1m of snow. The Jan 6th surface hoar/crust interface is still prevalent in some isolated areas. Today in Kootenay it was found 35cm down. It did not react to skier traffic.

Avalanche Summary

No avalanches observed or reported.

Confidence

Track of incoming weather systems 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.