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Avalanche Forecast

Archived

Dec 25th, 2012–Dec 26th, 2012

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

Regions

Sea To Sky.

Confidence

Fair

Weather Forecast

Wednesday: Light SW winds. Alpine temp -8. A few cm snow.Thursday/Friday: Light SW winds. Alpine temp -7. No precipitation on Thurs; light snow possible on Friday.

Avalanche Summary

A natural cycle to size 2.5 was reported over the past few days. Wind slabs have also been triggered by explosives and skiers. Natural avalanche activity is likely to decrease over the next few days, but human-triggering remains possible.

Snowpack Summary

Wind slabs which formed during last week’s strong winds are now buried by 10-30 cm of new snow and may be found in alpine and open treeline terrain. New cornices exist. In sheltered areas below treeline, loose snow is slowly becoming more consolidated. Three surface hoar layers in the upper/mid snowpack appear to be gaining strength. In general, the mid-pack is strong.Near the base of the snowpack, a crust/facet layer has become 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.