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Avalanche Forecast

Archived

Mar 7th, 2013–Mar 8th, 2013

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Extra caution advised in areas where the storm slab overlies a weak, faceted base (east of the Divide and near ridge crests).

Weather Forecast

Tomorrow and Saturday, mainly sunny except morning overcast/broken cloud over the southern regions. Freezing level to remain below 1200m, with alpine high's up to -7*. Winds light from the NW.

Snowpack Summary

The storm snow from last weekend continues to strengthen as a unit, with no obvious shears within it. It also seems to be bonding reasonably well to the underlying snow surfaces. However, in areas of thinner snowpacks (east of the Divide) and on steeper, southern aspects, the storm slab remains touchy and human triggering to size 3 is possible.

Avalanche Summary

Yesterday, a group of skiers remotely triggered, from 100m away, a size 3 slab near Dolomite Peak. They reported it failed on a S aspect and the crown was up to 2m thick. A field team behind the Lake Louise ski area noted several whumph's along open, tree-line features, and as a result, skied conservatively with little confidence in open slopes.

Confidence

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.