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Avalanche Forecast

Archived

Nov 26th, 2019–Nov 27th, 2019

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.

The main avalanche concern over the next few days is a lingering wind slabs formed over the weekend. Natural avalanche activity on this problem has subsided, but the possibility of human triggered wind slab is still possible.

Weather Forecast

A predominant North West flow has moved into the forecast region.

Wednesday temperatures drop to -20 for the daytime lows, isolated light flurries along the Eastern part of the region, winds light from the NE.

Temperatures will gradually warm up and skies will clear later in the week.

Snowpack Summary

Colder temperatures have started to penetrate the snowpack. The older wind slabs from the strong SW winds on the weekend are visible and less reactive. The Nov 8 crust is down 20-30 cm and present up to ~2400 m. The lower snowpack is a mix of weak facets & Oct crusts. Snowpack depths at treeline range from 60-90 cm with up to 140 cm in lee areas.

Avalanche Summary

Although the wind slabs from last weekend have become less reactive, ski cuts and explosive work today triggered slabs up to size 1.5, 20-30 cm thick. No new natural avalanches in past few days.

Confidence

Due to the number and quality of field observations

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.