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Avalanche Forecast

Archived

Dec 22nd, 2012–Dec 23rd, 2012

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.
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

Increased SW to SE winds Sunday with continued cool temperatures and some light snow in regions South of the Trans Canada Highway.  Winds will abate by Sunday night and we should see cold and clear conditions Monday.

Snowpack Summary

A field trip to Yoho  found soft wind slabs (4 finger) near ridge crests 20cm thick.  These were buried by 10cm of low density powder. Reports of stiffer wind slabs in wind exposed terrain. Low density powder in sheltered features. Thicker snowpack areas have mainly well settled midpack. The Nov.6 crust is mainly now a facet layer in thinner areas.

Avalanche Summary

No avalanches observed or reported today. 

Confidence

Wind speed and direction is uncertain on Sunday

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.