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Avalanche Forecast

Archived

Feb 27th, 2020–Feb 28th, 2020

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

Regions

Little Yoho.

Great skiing continues in sheltered areas. Watch for new wind slabs in alpine lee areas and continue to minimize exposure to cornices.

Weather Forecast

Temperatures remain mild on Friday with treeline staying around -5'C. Winds will remain in the moderate range out of the SW. We will see continued flurries with up to 5 cm's of new snow during the day and more intense flurries starting in the evening with up to 15 cm in total. Saturday will cool down and the winds will ease up.

Snowpack Summary

Some wind effect and new wind slabs in lee areas of the alpine. 10-20 cm of recent snow over buried sun crusts on steep solar aspects. The Feb. 1 rain crust is down 20-50 cm and present below 1900 m. A dense snowpack with no significant weaknesses is present in most areas, but thin rocky areas have a faceted base.

Avalanche Summary

Local ski hills reported newly formed wind slabs isolated to immediate lee slopes near ridge crests. Ski patrol and Visitor Safety teams were able to ski cut size 1 avalanches on this layer. Some large sluffs out of extreme rocky terrain up to size 1.5 were reported and one natural cornice failure was observed.

Confidence

Intensity of incoming weather systems is uncertain on Friday

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.