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Avalanche Forecast

Archived

Feb 25th, 2021–Feb 26th, 2021

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

Regions

Little Yoho.

Explosive control work Wednesday found slabs were reactive in the alpine and into treeline. Consider human triggering of these slabs to be likely.

Weather Forecast

Thursday evening will bring up to 5cm of additional snow as the west winds diminish to moderate. Friday winds will shift NW and diminish to light to moderate accompanied by trace amounts of snow temps will reach -3C at 1500m and -15C at 3000m. Saturday will bring an additional bit of snowfall and cooling to -10C at 1500m and -20C at 3000m.

Snowpack Summary

5 to 10cm of new snow arrived with strong winds Thursday contributing to the wind slabs above the February 19 interface created by 50cm of snow combined with extreme west winds over the weekend. Now down 60 to 90cm, facets buried Jan 27 provide weak support for the upper snowpack and have been entrained as avalanches gouge down to them.

Avalanche Summary

Wednesday, explosive triggers continued to easily release large avalanches running to the bottom of their paths. This includes large avalanches on Mt Field and Mt Dennis. Results in the Simpson area were limited due to less wind in the area. A skier accidental sz 1.5 on the SW slope between Wolverine and Purple bowl was reported late Wednesday.

Confidence

Due to the number 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.