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Avalanche Forecast

Archived

Mar 8th, 2021–Mar 9th, 2021

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.

A hard freeze to start the day Tuesday with little heating expected as winds pick up. Watch for further wind slab development.

Weather Forecast

With mainly clear skies, a strong freeze is expected Monday night. As west winds pick up to the moderate range in the alpine Tuesday, minimal heating is expected despite clear skies. Clouds will develop overnight Tuesday leading to milder morning temperatures and the potential for flurries through the day Wednesday. Clearing overnight into Thursday

Snowpack Summary

Since Friday, up to 30 cm of recent snow sits over solar crusts and wind effect in open areas. New solar crusts on isolated steep slopes formed on Monday. Facets are present down 70-100 cm but we are getting minimal to no results in snowpack tests and not seeing avalanche activity on these layers like we are in the Banff and Kootenay regions.

Avalanche Summary

Two large events were observed in the past 24 hrs in the neighboring BYK region. A size 3 cornice triggered slab ran between the 4rth and 5th buttresses of Rundle Sunday, and a large powder cloud was observed off of Mt. Lefroy into the Death Trap from Lake Louise Monday. Both of these events seem to have involved the persistent layers.

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.