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Avalanche Forecast

Archived

Nov 12th, 2012–Nov 13th, 2012

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

Regions

Little Yoho.

Weather Forecast

Mixed sun and cloud for next few days. Freezing Levels rising to ~1200m on Tuesday. Light to moderate westerly winds.

Snowpack Summary

Up to 35 cm of recent storm snow has formed widespread wind slabs in the alpine and is sitting overtop of the Nov 6 rain crust. November 6 crust is well developed at treeline elevations but was not found above 2700 m. At treeline average snowpack depth is 70 cm deep.

Avalanche Summary

No new naturals today. Ski hills reporting slabs up to Class 2 with explosives running within storm snow or on Nov. 6 crust.  Class 2 slab on St Nich (reported yesterday) ran on firn snow and was human triggered. See Facebook link below for picture.

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.