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Avalanche Forecast

Archived

Feb 22nd, 2018–Feb 23rd, 2018

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

Regions

Northwest Coastal.

Weather forecast models disagree about snow amounts. If it is snowing heavily and/or blowing in your area, expect high avalanche danger.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Friday

Weather Forecast

THUSRDAY NIGHT/ FRIDAY: 20-40 cm light dry snow. Freezing level near 600 m. Moderate south-westerly winds. Weather models suggest heaviest snow in the Terrace area, with less as you travel east and north.SATURDAY: 5-10 cm snow. Freezing level near 400 m. Moderate south-westerly winds. SUNDAY: 10-20 cm snow. Freezing level near 400 m. Light to moderate south-westerly winds. More details can be found in the Mountain Weather Forecast.

Avalanche Summary

Rapid wind loading caused a natural avalanche cycle on Wednesday. On steep solar aspects, size 1-2 loose wet avalanches were also observed.New snow and wind are expected to cause a rise in avalanche activity on Friday and the weekend.

Snowpack Summary

Incoming snow is expected to be light and dry, but will come with moderate to strong south-westerly winds. Loose snow sluffing and fresh wind slabs are likely problems on Friday. New snow will overlie old soft and hard wind slabs. In the upper pack is an interface of sun crusts, facets and spotty surface hoar (which is most prevalent in sheltered treed locations). Deeper in the snowpack, around 50-150 cm down, you'll find a crust/surface hoar layer, which still has the chance to surprise you and could be triggered from a thin snowpack spot, or with a large trigger like cornice fall.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.