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Avalanche Forecast

Archived

Dec 7th, 2018–Dec 8th, 2018

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

Northwest Coastal.

Strong shifting wind will increase the danger at higher elevations.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

FRIDAY NIGHT: Light snowfall starting overnight with accumulations up to 10 cm near the coast and less inland, strong wind out of the south, freezing level climbing to 500 m.SATURDAY: Light flurries easing off throughout the day with accumulations of 1-3 cm, strong wind out of the south, freezing level climbing to 800 m.SUNDAY: A second storm pulse brings 10-20 cm of snow, freezing level steady around 1000 m, strong wind out of the south.MONDAY: Ongoing flurries with another 5 cm of snow, moderate to strong wind out of the southwest, freezing level around 800 m.

Avalanche Summary

No recent avalanche activity has been reported. Please post your observations to the Mountain Information Network (MIN) this weekend.

Snowpack Summary

We currently have very limited snowpack observations, but expect an average snow depth of 70-120 cm in the alpine. This decreases dramatically with elevation where the primary hazards are rocks, stumps, and open creeks.There were reports of feathery surface hoar growing on the surface last weekend in the neighboring Northwest Inland region (see this MIN report) and in Ningunsaw to the north. However, recent outflow winds have likely changed the snow surface conditions and formed stiff wind slabs in open terrain. A hard crust has been reported 10-15 cm below the surface, and in some locations there is an early season crust with facets near the bottom of the snowpack. Check out the MIN report from the Anderson Cabin near Terrace (here).

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.