Avalanche Forecast

Issued: Jan 14th, 2017 4:27PM

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

Avalanche Canada cgarritty, Avalanche Canada

Recent winds have been building avalanche hazard while cold temperatures have helped snowpack weaknesses to persist. Stay cautious of wind slabs and keep the persistent slab problem on your mind in shallow snowpack areas.

Summary

Confidence

Moderate -

Weather Forecast

Sunday: Mainly cloudy with isolated flurries and a trace of new snow. Winds light to moderate from the southwest. Alpine temperatures of -7.Monday: Mainly cloudy with isolated flurries and a trace of new snow. Winds moderate to strong from the southwest. Freezing level rising to 1100 metres and alpine temperatures around - 4.Tuesday: Periods of snow bringing approximately 15 cm of accumulation. Winds strong from the south. Freezing levels rising to (and possibly exceeding) 1500 metres with alpine temperatures near 0.

Avalanche Summary

Size 1-1.5 wind slab avalanches have continued to run naturally in steep terrain, with the most recently reported activity observed on north aspects near Valemount.

Snowpack Summary

Cold and clear weather has promoted both faceting of surface snow as well as the growth of surface hoar that has been reported to be up to 7mm in size below treeline. Below the surface, recent new snow has been redistributed by moderate to strong southwest and more recent northerly winds in exposed upper areas. In deeper snowpack parts of the region, the mid-December facet layer lies up to 120 cm below the surface. In these areas, professionals feel this layer has generally gained considerable strength. In shallower areas, particularly those in the southeast (Allen Creek), North (Sugarbowl) and likely some western areas around Quesnel and Barkerville, the snowpack is likely a lot more suspect, with a thicker, more pronounced facet layer buried only 50-60 cm below the surface. In shallow snowpack areas such as these, careful evaluation of this facet layer is a prerequisite to any push into steeper terrain.

Problems

Wind Slabs

An icon showing Wind Slabs
Recent winds formed touchy wind slabs on many aspects in exposed alpine and treeline areas. Expect these to remain reactive over the short term and be aware of the potential for wind slab avalanches to trigger deeper weaknesses in the snowpack.
Be alert to conditions that change with aspect and elevation.Avoid areas where the snow feels stiff or slabby.Be cautious as you transition into wind affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Persistent Slabs

An icon showing Persistent Slabs
This layer has gained strength in many areas, but triggering an avalanche on facets buried in mid-December may still be possible in shallow snowpack parts of the region. Dig down and test for weaknesses before committing to larger terrain features.
Avoid shallow snowpack areas where triggering is more likely.Carefully evaluate big terrain features by digging and testing on adjacent, safe slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

2 - 3

Valid until: Jan 15th, 2017 2:00PM

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