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Avalanche Forecast

Archived

Jan 4th, 2013–Jan 5th, 2013

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

Regions

Sea To Sky.

It's worth noting that the weather forecast has changed and a storm is now expected this weekend.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Saturday: Moderate S winds. Alpine temperature around -4. 15-20 cm snow.Sunday: Moderate SW winds, easing towards the end of the day. Alpine temperature -4. 10-20 cm snow.Monday: Light winds. Alpine temperature -8.  Light snow, petering out.

Avalanche Summary

No recent avalanches have been reported. Cornice chunks falling onto slopes have not triggered slabs.

Snowpack Summary

Incoming snow may not bond well to existing snow surfaces including surface hoar (up to 20 mm in size), facets, hard wind slabs or a sun crust. Storm slab problems may develop quickly once it begins snowing. Recent SE winds have formed new wind slabs at alpine and treeline elevations, while older wind slabs appear generally well settled. No significant shears have been observed recently in the top or mid snowpack layers. Near the base of the snowpack, a crust/facet layer exists which is now unlikely to be triggered. However, professionals are still mindful of thin snowpack trigger areas or large loads (like a large cornice) which could wake it up again, leading to a very large avalanche.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.