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Avalanche Forecast

Archived

Dec 28th, 2012–Dec 29th, 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

Sea To Sky.

Confidence

Good

Weather Forecast

Friday night and Saturday: Light snowfall on Friday night with a clearing trend throughout Saturday / Moderate southwest winds associated with Friday's system becoming light and northwesterly on Saturday / Freezing level at 900mSunday: Clear skies / Light and variable winds / Freezing level at 900m with the possibility of an inversionMonday: Mostly clear skies / Light southwest winds / Freezing level at 1100m with the possibility of an inversion

Avalanche Summary

On Wednesday several size 1 very soft slab avalanches were triggered by ski cutting. A size 1.5 natural cornice release was observed in the region on Thursday. No slab released on the slope below.

Snowpack Summary

Relatively new and buried wind slabs may be found in alpine and open treeline terrain. Fragile cornices exist. A couple of storm snow weaknesses have been observed, but these are likely to be short-lived. In sheltered areas below treeline, loose snow is slowly becoming more consolidated. In general, the mid-pack is strong.Near the base of the snowpack, a crust/facet layer is now unlikely to be triggered. However, professionals are still mindful of thin snowpack trigger areas or large loads which could wake it up again, leading to a very large avalanche.

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.