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Avalanche Forecast

Apr 13th, 2013–Apr 14th, 2013
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Sea To Sky.

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.

Avalanche Problems

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

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