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Avalanche Forecast

Archived

Mar 2nd, 2020–Mar 3rd, 2020

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

Regions

Little Yoho.

Strong to Extreme alpine winds will continue to develop the wind slab problem at upper elevations. Limit your exposure to overhead hazards like cornices.

Weather Forecast

Light snow overnight Monday with accumulation amounts of 2-5cm. Alpine winds will continue to be in the strong to extreme range over the next few days. Another more significant pulse of snow is forecasted for Tuesday night with forecasted accumulation amount of 10-20cm. Freezing levels will remain near valley bottom.

Snowpack Summary

5-10 cm of 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

Direct observations of a few small natural avalanches initiated from strong SW winds were noted Monday afternoon.

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.