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Avalanche Forecast

Archived

Apr 8th, 2021–Apr 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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

Recent fresh snow has been redistributed into pockets of wind slab at upper elevations. Use caution in wind exposed terrain.

Confidence

Moderate - Recent weather patterns have resulted in a high degree of snowpack variability within the region.

Weather Forecast

Thursday night - Mainly clear / moderate southwest wind / alpine low temperature near -7 / freezing level at or near valley bottom

Friday - Cloudy with sunny periods / moderate southwest wind / alpine high temperature near -4 / freezing level 1700 m

Saturday - Mainly cloudy with a few flurries, 3-5 cm / moderate northwest wind / alpine high temperature near -6 / freezing level 1300 m 

Sunday - Mainly sunny / light west wind / alpine high temperature near -3 / freezing level 1700 m 

Avalanche Summary

Wind slabs may continue to be reactive in lee terrain features, especially in areas that have received higher recent snowfall amounts.

A few size 1.5 dry loose and wet loose avalanches were reported on Tuesday. No new avalanches were reported on Wednesday.

Snowpack Summary

Anywhere between 5-20 cm of new snow fell in the region with Wednesday's storm. The highest amounts were near Nelson and Kootenay Pass. Moderate southwest winds may form reactive wind slabs in lee terrain features.

The new snow likely sits on a crust in most places, except above 2000 m on northerly aspects, where it likely sits on older wind slabs or soft snow. 

Terrain and Travel

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.