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Avalanche Forecast

Apr 12th, 2013–Apr 13th, 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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Sea To Sky.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Saturday: Expect an unsettled day, with mostly cloudy skies and intermittent flurries. Accumulations of 5cm are possible with upslope areas receiving brief, intense snowfalls yielding deeper localized deposits. Alpine temperatures should remain cool at around -7 with light to moderate westerly winds.Sunday: We should see a mix of sun and cloud, with a chance of isolated flurries. Alpine temperatures climb slightly to around -5 with light easterly winds.Monday: Expect a continued clearing trend with scattered clouds, alpine temperatures reaching -4 and light easterly winds.

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 10cm of storm snow has fallen recently. This overlies up to 50cm of previous storm snow from last Wednesday. At low elevations rain continues to saturate the snowpack. The previous storm was accompanied by moderate to strong south/southwest winds which left variable snow distribution in exposed terrain with dense wind slabs forming in lee and cross-loaded 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 very large and could pop off with continued mild temperatures.

Avalanche Problems

Storm 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: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 5

Cornices

Recent snow and wind has added mass to existing large and potentially destructive 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