Avalanche Forecast

Issued: Mar 30th, 2012 10:37AM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Wind Slabs, Loose Wet and Cornices.

Avalanche Canada triley, Avalanche Canada

Summary

Confidence

Fair - Forecast snowfall amounts are uncertain on Saturday

Weather Forecast

A moist unstable southwest flow is expected to continue to bring another 5-10 mm of precipitation combined with moderate gusty winds overnight to coastal areas. A surface high pressure is forecast to follow on Saturday morning that should be a bit drier, but light precipitation is expected to continue for most of the day near the coast. The wind should swing to the southeast and become light with moderate gusts. The interior areas around Smithers should see some broken skies and sunny periods. Another broad low pressure is expected on Sunday that should bring some light precipitation to both the coast and the interior. The next major system is expected on Monday.

Avalanche Summary

No reports of new avalanches from this region.

Snowpack Summary

Moderate-Strong SE-S winds continue to build wind slabs. They may be found in unusual places, lower on the slope or in open areas below treeline. Windward aspects may become wind pressed, and even scoured. North aspects at higher elevations hold dryer, low density snow in the upper 20 cm. Spring-like conditions exist and crusts have formed on solar aspects at all elevations, becoming moist under sunny skies. Melt-freeze conditions exist @ treeline on all aspects. Below treeline has remained moist, with no recovery below 1500 m. The mid-pack is well consolidated. The mid February persistent weak layer, comprised of spotty surface hoar, facets and crusts, is buried 80-120 cm below the surface. No recent activity has been reported on this interface. It most likely needs a large trigger on a specific spot. If an avalanche occurs on this weak interface it will be very large and destructive. Below this the snowpack is well settled and strong. Cornices in the area are reported to be very large. Cornice failure could trigger an avalanche on the slope below.

Problems

Wind Slabs

An icon showing Wind Slabs
Strong southerly winds continue to build windslabs at ridgetops. It may take a couple of days for these windslabs to settle and bond.

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

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 4

Loose Wet

An icon showing Loose Wet
Unsettled weather conditions are expected to give a mix of sun and cloud. Periods of strong solar radiation may cause loose moist or wet avalanches on southerly aspects.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 5

Cornices

An icon showing Cornices
Large cornices have been reported in the region. Periods of sunny weather may weaken these cornices and they may fall off naturally.

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 5

Valid until: Mar 31st, 2012 9:00AM

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