Avalanche Forecast

Issued: Apr 13th, 2013 10:02AM

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

Avalanche Canada mpeter, Avalanche Canada

Summary

Confidence

Good

Weather Forecast

Sunday: Expect mixed skies, with a chance of isolated flurries. Alpine temperatures should reach -5 with freezing levels around 1400m under light southeasterly winds.Monday/Tuesday: Expect a clearing trend with scattered clouds, alpine temperatures reaching -3 and light easterly winds turning northeasterly.

Avalanche Summary

The recent storm snow has been reactive to rider triggering and explosive testing up to size 2.0. These avalanches are failing predominantly in wind loaded features on north through northeast aspects..

Snowpack Summary

Up to 15cm of new snow has fallen recently. This has settled rapidly into small reactive soft slabs due to strong greenhouse effect. The interface with this new snow is predominantly crusts (sun, wind and/or meltfreeze crusts) and where the crusts are smooth the bond is poor. Last Wednesday's storm deposited about 50cm of snow and was accompanied by moderate to strong south/southwest winds. Dense windslabs are now buried, but may still be reactive to large triggers in lee and cross-loaded alpine features. Up to 85cm below the surface you will likely find a melt-freeze crust from previous sunny weather. At the same interface, you may find spotty surface hoar on high north facing terrain. Large natural activity and remote triggers from earlier in the week suggest the surface hoar may continue to be reactive, especially with the weight of the new snow.Cornices are huge and have fresh tabs from the recent storm snow.

Problems

Wind Slabs

An icon showing Wind Slabs
Recently formed storm/windslabs exist at treeline and above. Triggering is most likely in wind-affected terrain, or on steep unsupported slopes where buried crusts or surface hoar exist.
Be cautious as you transition into wind affected terrain.>Dig down to find and test weak layers before committing to a line.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 5

Cornices

An icon showing Cornices
Recent snow and wind has added mass to existing cornices
Give cornices a wide berth when travelling on or below ridges.>

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 6

Valid until: Apr 14th, 2013 2:00PM

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