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Avalanche Forecast

Archived

Mar 3rd, 2020–Mar 4th, 2020

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

More snow and wind will heighten the avalanche danger in the region. Avoid travel in wind loaded areas and limit your exposure to overhead hazard.

Large avalanches at upper elevations can reach terrain below tree line.

Weather Forecast

Forecasted snow for Tuesday night varies from 5-30cm through the region. This pulse of snow will be accompanied by strong Westerly winds. The snow will end midday Wednesday with a short lived clearing trend Thursday. Another system will move into the region late Thursday with more snow on the way.

Snowpack Summary

New snow with strong SW winds forming new wind slab in the alpine down to tree line. Watch for buried sun crust on steep solar aspects. The Feb 1 rain crust is down 30-60 cm and present below 1900 m. Generally this area has a strong snowpack, with snow depths over 300 cm in the alpine.

Avalanche Summary

No new natural avalanches observed Tuesday. Ski hills reported continued wind slab development at alpine and tree line elevations. Explosive control produced avalanches to size 1 on this new wind slab. With more snow and wind forecasted Tuesday night we will likely see continued slab development at upper elevations.

Confidence

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.