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Avalanche Forecast

Archived

Mar 1st, 2017–Mar 2nd, 2017

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

Regions

Little Yoho.

Anticipated snow Tuesday/Wednesday did not materialize. Next system to arrive Thurs-Friday night. Expect the danger to rise.

Weather Forecast

For Thursday, expect scattered flurries, gusty SW winds, and alpine highs around -6C. Snow to move into the region late Thursday/Friday morning with moderate to strong SW wind. The total snowfall is uncertain, but could be in the range of 15-25 cm.

Snowpack Summary

30cm of soft snow overlies a well-settled and firm middle of the snowpack. Near treeline, concern remains for a facetted layer that sits in the lower third of the snowpack, and an old surface hoar layer down about 50-60 cm that has recently produced sudden planar shears. Deeper snowpacks to the west of the Wapta Icefields have the strongest snow.

Avalanche Summary

No new avalanches were observed or reported on Tuesday.

Confidence

Forecast snowfall amounts are uncertain

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.