Avalanche Forecast

Issued: Apr 9th, 2013 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Storm Slabs and Loose Dry.

Parks Canada ian jackson, Parks Canada

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Banff Yoho Kootenay.

If the storm arrives as forecasted, avalanche danger will rise on Wednesday.  Be cautious of overhead hazard as natural avalanche activity is likely from steep alpine terrain.

Summary

Weather Forecast

A system is approaching on Wednesday and is forecasted to bring 10-20 cms with M-S SW alpine winds and freezing levels to 1800m.  On Thursday, the storm eases with only a few cms. cooling temps, and easing winds. Friday is looking relatively clear, with cool temps and light winds.

Snowpack Summary

Cold temperatures have tightened the snowpack, creating a supportive crust at lower elevations. In the alpine and at treeline, convective storms have dropped 10 - 30 cm of new snow which sits on top of suncrusts on solar aspects and old facetted snow on polar aspects. In some areas, windslabs may exist, although the winds have been mostly light.

Avalanche Summary

A field team in the White Pyramid area on the 93N remote triggered a small, thin windslab of little consequence in the alpine today.  Reports indicate increased winds were causing numerous loose dry avalanches out of steep alpine terrain.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Problems

Storm Slabs

An icon showing Storm Slabs
The forecasted precipitation, winds, and increased temps will create new storm and windslabs that will be most reactive during the storm. Natural activity will decrease once the system passes, but the newly formed slabs will take a few days to settle
Avoid areas with overhead hazard.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Loose Dry

An icon showing Loose Dry
Increased winds today caused numerous loose dry avalanches in steep alpine terrain. Forecasted new snow, winds and warming temps will increase activity in this terrain. This is of particular concern for climbers or skiiers entering steep couloirs.
Be cautious of sluffing in steep terrain.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Apr 10th, 2013 4:00PM

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