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Avalanche Forecast

Archived

Feb 20th, 2015–Feb 21st, 2015

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

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Confidence

Good - The weather pattern is stable

Weather Forecast

The weather forecast looks much as it has for the last few days.  Saturday could see some light precipitation in the form on isolated flurries with light northeast winds and daytime high freezing level of 1200m.  Sunday and Monday are expected to be clear and dry with light northerly winds and a freezing level of 1200m to 1600m.

Avalanche Summary

Things appear to be locked up tight and no new avalanches have been reported in the last couple of days.

Snowpack Summary

A wide spread crust can now be found all the way to ridge crest.  Surface hoar has been reported above this crust in the areas around Nelson.  The curst is effectively “caping” the snowpack and doing a good job of protecting the buried weak layers bellow.  However, recent snowpack tests suggest that the mid-January surface hoar layer could still produce an avalanche if given a large enough trigger.  It can be found down about 1m in the alpine and 50-60cm at treeline. The mid-December crust/facet/surface hoar weakness may persist in the mid to lower snowpack at higher elevations.

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.