Avalanche Forecast

Issued: Jan 22nd, 2017 4:14PM

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

Avalanche Canada mgrist, Avalanche Canada

Don't let the lure of deep powder in the alpine zone draw you into terrain that's inappropriate for the conditions.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

We're looking at seasonal temperatures, light winds, a mix of sun and cloud with occasional isolated flurries for most of the week. MONDAY: Cloudy with sunny breaks. Freezing levels around 1100m with light northerly winds. TUESDAY: A mix of sun and cloud. Freezing levels around 500m with light northerly winds. WEDNESDAY: A mix of sun and cloud. Freezing levels around 500m with light westerly winds.

Avalanche Summary

No new reported.

Snowpack Summary

SOUTHERN AREAS (e.g. Coquihalla): 10-20cm of snow from last week appears to be bonding well to the previous rain-soaked snow surface up to treeline elevations. At alpine elevations, up to 40cm of storm snow fell with some wind slabs forming on northerly aspects.NORTHERN AREAS (e.g. Duffey Lake): Up to 45 cm of fresh snow by Friday morning brought the storm snow totals to over a metre, which was all redistributed by moderate to strong southerly winds. This resulted in touchy storm and wind slabs bonding poorly to the previous snow surface that includes facets and large surface hoar on sheltered slopes and/or a sun crust on steep sun-exposed aspects, as well as wind-affected surfaces (e.g. hard wind slab, sastrugi, scoured crust, etc.) in exposed areas. Weaknesses within the recent storm snow have been settling - I'd remain suspicious of the bond of the storm snow in the alpine to the previous cold snow surface from over a week ago.

Problems

Wind Slabs

An icon showing Wind Slabs
Weaknesses exist within and under the new snow. Slabs will be particulary deep and touchy on wind-loaded northerly aspects near ridge crests. Small avalanches may "step down", resulting in large destructive avalanches.
Be aware of the potential for wide propagations.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Jan 23rd, 2017 2:00PM

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