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Avalanche Forecast

Archived

Feb 19th, 2019–Feb 20th, 2019

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 Coast Inland.

Wind slabs are susceptible to human triggering. Use added caution near ridges on all aspects.

Confidence

High -

Weather Forecast

TUESDAY NIGHT: Mostly cloudy with isolated flurries, trace accumulation, light to moderate northeast wind, alpine temperature -10 C.WEDNESDAY: Mostly cloudy, light to moderate northeast wind, alpine temperature -12 C.THURSDAY: Clear skies, light northwest wind, alpine temperature -12 C.FRIDAY: Cloudy with snowfall, accumulation 5 cm, moderate southwest wind, alpine temperature -12 C.

Avalanche Summary

There were numerous reports of wind slab avalanches being triggered in the region over the weekend. Check out the many MIN reports on the map view or here for some great observations. In general, small to large (size 1 to 2) wind slabs were triggered in steep alpine terrain. They were generally 10 to 30 cm deep and on southwest to northwest aspects.There have also been some reports of whumpfing and settlements, generally below treeline.

Snowpack Summary

Snow surface conditions are variable. At higher elevations, wind slabs exist in lee terrain features from recent snowfall and strong winds blowing in variable directions. In sheltered areas, around 10 to 20 cm of low-density snow may be found, possibly on a smooth melt-freeze crust. On southerly slopes, moist snow or a thin melt-freeze crust is to be expected.Several crusts can be found 20 to 60 cm below the surface. Weak surface hoar and faceted snow may be found around these crusts, but have produced little avalanche activity over the past month. The remainder of the snowpack is generally well-settled.

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.