Avalanche Forecast

Issued: Feb 2nd, 2017 4:20PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada swerner, Avalanche Canada

Rider triggered wind slabs remain the primary concern.

Summary

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

The cold arctic outflow will reside as an active weather pattern reaches the Coast tomorrow bringing slightly warmer temperatures, strong winds and new snow. Snow amounts will be slightly less on the Duffey and communities to the North.Friday: Snow amounts 5-10 cm with ridgetop winds light-moderate from the southeast. Alpine temperatures near -5.Saturday: Snow amounts 10-20 cm with ridgetop winds light-gusting strong from the southwest. Alpine temperatures near -5 and freezing levels rising to 800 m.Sunday: Snow amounts near 30 cm on the Coquihalla and 20 cm on the Duffey. Ridgetop winds moderate from the southwest. Alpine temperatures near -10.

Avalanche Summary

There were no new avalanche observations reported on Wednesday. Wind slabs may be reactive to rider triggers at higher elevations. In thin rocky areas to the north, wind slabs could potentially step down to deeper weak layers.

Snowpack Summary

Lingering reactive wind slabs and wind scoured snow exist on exposed terrain at treeline and in the alpine. The new snow sits above a thin breakable sun crust and isolated pockets of surface hoar, potentially creating weak interfaces for wind slabs to propagate along. In northern areas (Duffey), the mid-January surface hoar and facet interface is now buried 50-80 cm down and remains a concern especially in shallower snowpack areas like the Hurley and/ or South Chilcotins. In southern areas (Coquihalla), the lower snowpack is reportedly well settled compared to the North.

Problems

Wind Slabs

An icon showing Wind Slabs
Recent switching winds may have formed pockets of wind slab on all aspects at upper elevations especially near ridge crests and cross-loaded slopes. Use caution around shallower snowpack areas where wind slabs could step down to deeper weak layers.
Avoid steep convexities or areas with a thin or variable snowpack.Use ridges or ribs to avoid pockets of wind loaded snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2

Valid until: Feb 3rd, 2017 2:00PM

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