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Avalanche Forecast

Archived

Feb 13th, 2020–Feb 14th, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Columbia.

Be cautious on steep and convex slopes where new snow may have been blown into wind slabs.

Confidence

High - Confidence is due to a stable weather pattern; little change is expected for several days.

Weather Forecast

THURSDAY NIGHT: 5-15 cm of new snow, moderate wind from the west, alpine temperatures drop to -8 C.

FRIDAY: Scattered flurries with 5-10 cm of new snow, moderate wind from the west, alpine high temperatures around -5 C.

SATURDAY: Cloudy with some light flurries, moderate wind from the southwest, alpine high temperatures around -5 C.

SUNDAY: Cloudy with 5-10 cm of new snow, light wind from the west, alpine high temperatures around -5 C.

Avalanche Summary

On Wednesday numerous size 1-2 wind slab avalanches ran naturally on a variety of aspects and several small (size 1) slabs were human triggered on steep north and east facing slopes. A similar pattern of wind slab avalanches has been observed over the past few days.

Snowpack Summary

30-60 cm of low density snow has fallen over the past week and has formed isolated wind slabs at higher elevation. The depth of new snow diminishes considerably at lower elevations. This snow sits above a rain crust with an upper extent that varies from 1900 m in some areas to mountaintop in others.

The mid and lower snowpack are generally well settled and strong, but contain two deeper weak layers that we have been tracking since the early part of the season. The late December surface hoar layer, buried 100 to 180 cm deep, is now suspected to be dormant. A facet/crust layer from November exists near the ground in the highest elevations of the region. It remains a limited concern that is likely only able to be triggered with a large load, in high elevation, thin snowpack areas of the Selkirks and the southern half of the region.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • 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.