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Avalanche Forecast

Archived

Feb 8th, 2020–Feb 9th, 2020

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

Regions

North Columbia.

A stable weather pattern is the forecast for the next few days. Watch for fresh wind slabs in the lee of terrain features. Cornices have grown large and seem to be particularly fragile right now.

Confidence

High - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

Saturday Night: Cloudy with clear periods. Light northwest wind. Alpine high temperatures around -10.

Sunday: Mainly cloudy with sunny breaks. Light to moderate northwest wind. Alpine high temperatures around -8.

Monday: A mix of sun and cloud. Light northwest winds. Alpine high temperatures around -6.

Tuesday: Scattered flurries. Light to moderate west winds. Alpine high temperatures around -5.

Avalanche Summary

Thursday and Friday's reports showed loose dry size 1-1.5 avalanches running naturally from steep slopes facing the sun and a few small (size 1) wind slabs triggered with ski cutting and skier traffic on steeper rolls and ridgetop features.

With continuous stormy weather over the past week, there have been a handful of very large (size 3-4) avalanches breaking on deeply buried weak layers on slopes above 2000 m. Although the likelihood is low, large wind slab avalanches or large cornice fall may have the potential to step down to these layers.

Snowpack Summary

30-60 cm of snow from the last week now overlies older wind-affected snow at high elevations, with about half this amount instead overlying a widespread melt-freeze or rain crust to a variable upper extent of 1700-2400 metres in elevation. 

The mid and lower snowpack are generally well settled and strong. Although isolated, there are two deeper weak layers that may persist in some areas. A weak layer of surface hoar buried 90 to 170 cm deep may be found across the north of the region while a facet/crust layer from November may be found near the ground in shallower snowpack areas.

Terrain and Travel

  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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.