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Avalanche Forecast

Archived

Feb 14th, 2013–Feb 15th, 2013

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.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Friday

Weather Forecast

Friday: Mix of sun and cloud / Light to moderate southwest winds / Freezing level at 2100mSaturday: Light snowfall / Moderate southwest winds / Freezing level at 1100mSunday: Mix of sun and cloud / Light and variable winds / Freezing level at 1300m

Avalanche Summary

No new avalanche activity has been reported from the region.

Snowpack Summary

Very light amounts of recent snowfall in the Duffey Lake area and over 20cm on the Coquihalla overlie crusts on previously sun-exposed slopes and small surface hoar in sheltered locations. These recent accumulations have been distributed into wind slabs at higher elevations.A slightly deeper crust buried around Feb 3th lies approximately 20-50 cm below the surface. This interface was the focus of recent avalanche activity during the last storm. Activity has since tapered off on this layer; however, reactivity may still be possible in steep, unsupported terrain. Down approximately 50-70 cm sits another persistent interface comprising of crusts, facets and surface hoar crystals. This layer is now mostly unreactive, with only one size 2 avalanche reported (on Feb 6th) since the end of January. If it were to be triggered again, the most likely spot would be a steep convex roll on a sheltered north aspect slope around treeline.  The mid and lower snowpack pack layers are 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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.