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Avalanche Forecast

Archived

Jan 1st, 2013–Jan 2nd, 2013

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

South Coast.

Confidence

Good

Weather Forecast

Wednesday: Dry with sunny spells. An inversion is likely with alpine temperatures a couple of degrees above zero. Ridgetop winds gusting to 40 km/h from the SW. Thursday: Dry, with sunshine in the morning. The inversion will continue into Thursday. Ridgetop winds remaining around 40km/h. Friday: up to 5 cm snow. Freezing level lowering to around 1000m. Winds around 40km/h from the SW.

Avalanche Summary

A cornice fall released a size 2 slab avalanche on Monday.

Snowpack Summary

The steep South facing aspects are getting moist with warm temperatures and sun effect weakening the surface layer during the afternoons. As an overview, the snowpack is generally well-settled.? Near the base of the snowpack, the crust/facet layer appears to be inactive but still produces the sudden planar and collapse shears in isolated areas, especially in the Northern part of the region. Although unlikely, triggering an avalanche on a basal may be possible from thin snowpack areas or with a very heavy trigger.

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.