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Avalanche Forecast

Archived

Nov 22nd, 2011–Nov 23rd, 2011

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 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

Northwest Coastal.

This bulletin is based on limited data. Local variation in conditions and danger levels are likely to exist. To produce more accurate forecasts, we need information. Please send an email to [email protected]

Confidence

Poor - Due to limited field observationsfor the entire period

Weather Forecast

Wednesday: 20-30cm of snow, primarily in the southwestern part of the region, with freezing levels as high as 400m and strong southwesterly winds.Thursday: Another 20-40cm of snow with intensity tapering off throughout the day. Freezing levels in valley bottoms and moderate to strong westerly winds.Friday: Light to moderate precipitation with moderate to strong westerly winds.

Avalanche Summary

No recent avalanche have been reported, but I suspect natural avalanche activity occurred and will continue in response to heavy loading from snow and especially wind.

Snowpack Summary

Recent storm snow totals are in the 30-60cm range. Varying temperature, precipitation intensity, and wind throughout the recent storm, as well as surface hoar on the previous snow surface, has probably resulted in various weaknesses within and under the recent storm snow. Previous storm snow weaknesses could also be lurking in the upper snowpack. The mid and lower snowpack is generally well settled and strong with an old rain crust near the ground.

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.

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.