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Avalanche Forecast

Archived

Nov 19th, 2011–Nov 20th, 2011

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

Regions

Kootenay Boundary.

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 observations

Weather Forecast

Sunday: Expect clouds to build and winds to shift to southwesterly. Temperatures will remain cool. Flurries could begin in the evening. Monday & Tuesday: Periods of snow, especially the west side of the region. Winds will stay southwesterly and increase significantly as the storm intensifies. Expect freezing levels to reach 1500m on Tuesday.

Avalanche Summary

Observations are extremely limited at this time. No new avalanches have been reported.

Snowpack Summary

10-30cm of new snow has fallen in the last 48hrs, with significantly more at the south end of the region. Snowpack depths are likely in the 60-80cm range at about 1600m and about 125cms at 2000m. In the upper snowpack, windslab and storm snow instabilities exist around lee features and ridgelines. Watch for the possibility of reverse loading with the recent Easterly winds.

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.