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Avalanche Forecast

Archived

Apr 18th, 2013–Apr 19th, 2013

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

Regions

Little Yoho.

Weather Forecast

Light snow flurries along the divide forecast for Friday. On Saturday an upper trough moves south through the area bringing light snowfall throughout the day. Freezing levels will be around 1800 m.

Snowpack Summary

Spring conditions exist. Strong and supportive crusts exist on solar aspects up to at least 2300 m. North aspects are dry down to around 1900 m. There are areas of wind effect in the alpine and isolated wind slabs can be expected in lee areas above 2400 m. Overcast skies are helping to keep crusts intact through most of the day.

Avalanche Summary

In Kootenay Park a size 2 slab (~30 cm thick) on a north facing alpine cross-loaded feature was reported on Wednesday. In Yoho Park a skier controlled size 1 hard slab on a high elevation west aspect was reported on Tuesday.

Confidence

Wind effect is extremely variable

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.