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Avalanche Forecast

Archived

Feb 10th, 2012–Feb 11th, 2012

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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

Confidence

Good - -1

Weather Forecast

Saturday: Should stay dry with clouds and light winds that will pick up in the afternoon. Freezing level around 900 m. Overnight Saturday: light precipitation with 2-4 mm expected. Strong southerly winds. Sunday: Lingering flurries, otherwise dry with high pressure building. Freezing level around 700 m. Monday: Dry and sunny. Light winds.

Avalanche Summary

No new avalanches have been reported.

Snowpack Summary

A very light skiff of snow may have buried a surface hoar layer that lies on top of old surfaces comprising crusts and old wind slab. However, with only a centimetre or so of new snow, it's not certain that surface hoar crystals of 5 mm or more would get properly buried. Successive melt-freeze cycles have produced crusts on all aspects at lower elevations as well as on south-facing slopes higher up. The old wind slabs are no longer causing concern in most areas. A facet layer, which formed around 20th January, is buried around 60 cm and is reported to be gaining strength. It showed hard, resistant planar results in a compression test at treeline in the Hankin area 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.