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Avalanche Forecast

Archived

Feb 27th, 2022–Feb 28th, 2022

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

Regions

Banff Yoho Kootenay.

The hazard will gradually increase on Monday with new snow, wind and warmer temperatures. How much the hazard rises will depend on snow amounts so monitor this through the day.

Weather Forecast

Light snow is expected overnight Sunday with strong west winds. 12-15 cm of new snow with moderate west winds expected by the end of the day Monday. Freezing levels will rise to 1700m by Monday afternoon.

Snowpack Summary

Extensive wind effect in the alpine and treeline. Thin sun crust on steep solar aspects. 20-40 cm of faceted snow in sheltered areas over the Feb 15 sun crust/hard slab interface. The Jan 30th surface hoar/sun crust layer is down 35-60 cm and variable in distribution and reactivity, producing moderate sudden planar to no results in snowpack tests.

Avalanche Summary

A remote cornice failure triggered a size 3 avalanche in Kootenay National Park on Wednesday. On a flight over the forecast region Saturday several old avalanches from early last week were observed, this activity appeared to be a combination of wind slabs, storm slabs and loose dry. No avalanches observed or reported Sunday.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Tuesday

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.