Avalanche Forecast

Issued: Mar 9th, 2013 8:37AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Persistent Slabs and Cornices.

Avalanche Canada Peter, Avalanche Canada

Summary

Confidence

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

Weather Forecast

Sunday: A mix of sun and cloud with a chance of flurries. The freezing level climbs to 1200 m during the day. Winds are light to moderate from the southwest. Monday: A mix of sun and cloud. Temperatures are a degree or two cooler with the freezing level around 1000 m. Winds ease to light from the west-southwest. Tuesday: Moderate snow. The freezing level could rise to around 1500 m and winds increase to moderate or strong from the southwest.

Avalanche Summary

Cornice falls have triggered a few size 2-3 slabs on steep north-facing slopes over the past few days. There are also reports of loose snow avalanches triggering slabs up to size 2.5 in steep sun-exposed terrain.

Snowpack Summary

Sun crusts have developed on most solar exposed aspects. Surface hoar and surface facets are growing in most areas, and there is not much wind to disturb the new growth. The recent storm snow is settling, but storm slab releases are still possible. The weak layer of surface hoar that was buried around February 12th may be triggered by storm snow avalanches in motion, or by cornice fall and other large triggers. The strong solar radiation may trigger some cornice fall or release moist loose snow in steep terrain that may step down to one of the deeper weak layers.

Problems

Persistent Slabs

An icon showing Persistent Slabs
A weak layer of surface hoar buried down about 100-150 cm (February 12th layer) may continue to be triggered by large forces like cornice fall or storm snow avalanches in motion.
Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.>Choose well supported terrain without convexities.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 6

Cornices

An icon showing Cornices
Cornices have grown large and weak in recent storms. Solar warming could be enough to cause cornices to fail.
Give cornices a wide berth when travelling on or below ridges.>Avoid steep slopes below cornices.>

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

2 - 6

Valid until: Mar 10th, 2013 3:00PM

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