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Avalanche Forecast

Archived

Feb 9th, 2020–Feb 10th, 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.
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

North Columbia.

Broken skies with little precipitation along with winds switching direction will keep wind slabs at upper elevations the main concern.

Confidence

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

Weather Forecast

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

Monday: Cloudy with sunny breaks. Light northwest wind. Alpine high temperatures around -6.

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

Wednesday: Mix of sun and cloud. Light to moderate west wind. Alpine high temperatures around -8.

Avalanche Summary

Reports from Saturday show numerous loose dry avalanche size 1-1.5 running in steep terrain in the alpine and at tree line. There were also a few skier and rider along with naturally triggered storm and wind slab avalanches size 1-1.5.

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.

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.