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Avalanche Forecast

Archived

Feb 11th, 2014–Feb 12th, 2014

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

Regions

South Coast.

Confidence

Good

Weather Forecast

Wednesday: Heavy snowfall / Strong southwest winds / Freezing level at 1000mThursday: Heavy snowfall / Moderate to strong southwest winds / Freezing level at 1000mFriday: Moderate (heavy in the Coquihalla area) snowfall / Moderate southwest winds / Freezing level at 1000m

Avalanche Summary

No avalanche activity was reported at the time of publishing this bulletin, although I expect significant storm slab activity with forecast snow and wind.

Snowpack Summary

A developing storm slab (15 to 20cm in the north/ closer to 50cm along the Coquihalla) overlies a medley of old surfaces which include: weak surface facets, surface hoar, thin wind slabs, a scoured crust, or any combination thereof. Reports from the field indicate a poor bond between the new snow and these old surfaces. Strong to extreme winds are shifting the new snow into deeper, reactive wind slabs in exposed terrain. With more snow on the way, the reactivity and destructive potential of the developing storm slab should also increase. The mid and lower snowpack are generally strong and well-settled. Basal facets and depth hoar are likely to exist, especially in the north of the region, but triggering has become unlikely.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.