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Avalanche Forecast

Archived

Mar 27th, 2020–Mar 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, 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, human triggered possible.

Regions

Kootenay Boundary.

Ongoing flurries and wind have created heightened avalanche conditions at higher elevations.

Confidence

Low - Uncertainty is due to limitations in the field data.

Weather Forecast

Friday night: Mostly cloudy, scattered flurries with trace accumulations, light to moderate southwest wind, freezing level near 1500 m, alpine temperatures reach -4 C.

Saturday: Mix of sun and cloud, isolated flurries with trace accumulations, light to moderate southwest wind, freezing level climbing to 1700 m, alpine temperatures reach -1 C. 

Sunday: Cloudy, 5-15 cm of snow, moderate southwest wind, freezing level climbing to 1800 m, alpine temperatures reach -1 C. 

Monday: Cloudy, 5-15 cm of snow, moderate to strong southwest wind, freezing level climbing to 1700 m, alpine temperatures reach -2 C. 

Avalanche Summary

No recent avalanches have been reported, but mountain travel and field observations are very limited. Recent snow could form thin wind slabs with the potential to be reactive above the surface hoar that formed over the past week.

Snowpack Summary

Incremental flurries continue to accumulate at upper elevations. This snow sits above a variable mix of crusts, warm snow, and hard old wind slabs. It may also sit above some small surface hoar on shaded aspects. There is some uncertainty about how well the new snow will bond to these interfaces. Weak layers in the upper snowpack have trended towards dormancy. The most prominent and widespread layer was buried in late February and is now 40 to 80 cm deep. This layer was most commonly found in open trees and has produced a few isolated avalanches over the past month.

Terrain and Travel

  • Wind slabs are most reactive during their formation.
  • Avoid terrain traps where the consequence of any avalanche could be serious.

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.