Avalanche Forecast

Issued: Feb 22nd, 2019 5:20PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Storm Slabs.

Avalanche Canada cgarritty, Avalanche Canada

Give the new snow time to form a good bond with the old surface before committing to bigger terrain. Expect to encounter more dangerous conditions in western parts of the region, where the most new snow fell.

Summary

Confidence

Moderate -

Weather Forecast

Friday night: Cloudy with easing flurries bringing 5-10 cm of new snow. Winds shifting to light northeast.Saturday: Sunny. Light to moderate east winds. Alpine high temperatures around -15.Sunday: Sunny. Light to moderate northeast winds. Alpine high temperatures around -11.Monday: Sunny. Strong to extreme northeast outflow winds. Alpine high temperatures around -10.

Avalanche Summary

Preliminary observations of the new snow showed small avalanches beginning to occur naturally at the end of the day on Thursday under heavy snowfall at lower elevations in the Terrace area. Natural wind slab releases to size 2 were observed in the Bear Pass area. On Friday, several more small natural releases were observed at lower elevations in the Skeena corridor. Observations from the alpine remain limited at this time.Looking forward, expect natural avalanche activity to taper off on Saturday while the potential for human triggered avalanches remains elevated.

Snowpack Summary

20-50 cm of new snow fell over the region in the storm that began on Thursday, with the highest amounts favouring areas closer to the coast. The new snow has reportedly buried a new layer of surface hoar in sheltered areas as well as a new sun crust on solar aspects. It also adds to 15 cm of snow we received on Tuesday. In most areas, all of this snow collectively overlies hard, previously wind affected surfaces or crust. In limited sheltered areas, it may overlie an older layer of faceted (sugary) snow.In the south of the region, the remainder of the snowpack is well-settled.Around Bear Pass and in the north of the region, you may find two weak layers of surface hoar buried between 50 and 100 cm. The base of the snowpack may also be composed of weak and sugary faceted snow.

Problems

Storm Slabs

An icon showing Storm Slabs
20 to 50 cm of new snow fell since Thursday afternoon. This snow has likely formed slabs that may not bond well to underlying layers. The deepest accumulations will be in lee and cross-loaded terrain as a result of southwest wind during the storm.
Evaluate the bond between the new snow and the previous surface before entering avalanche terrain.Seek out sheltered areas where the new snow is unaffected by wind.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2.5

Valid until: Feb 23rd, 2019 2:00PM

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