Avalanche Forecast

Issued: Jan 15th, 2017 5:23PM

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

Avalanche Canada mgrist, Avalanche Canada

Wind slabs are slowly gaining strength but you can expect those on south aspects to be touchy. Avalanche danger will rise with the incoming snow Monday night.

Summary

Confidence

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

Weather Forecast

Big change is coming with significant snow (and some rain in the south) through to Thursday. MONDAY: Snow beginning near noon with 20 cm in the north (Duffey Lk area) and 30cm in the south (Coquihalla). Winds moderate (25-35 Km/hr) from the southwest. Alpine high temperatures to -2 Celsius in the north and +2 in the south. TUESDAY: In the north: 20-30 cm wet snow, freezing levels 1800m and alpine temperatures near -1. In the south: up to 50mm rain , freezing levels 2700m and alpine temperatures near +5 (!) Winds moderate gusting strong (40-60 Km/hr) from the southwest.  WEDNESDAY:  In the north: 15-20 cm wet snow, freezing levels 1600m and alpine temperatures near -1. In the south: up to 40mm rain , freezing levels 1900m and alpine temperatures near +4.  Winds moderate gusting strong (40-60 Km/hr) from the southwest. 

Avalanche Summary

Only a few loose wet natural avalanches (to Size 1.5) were observed on steep solar (south) aspects this weekend.

Snowpack Summary

We have widespread variability in the surface snow conditions due to all the shifting wind patterns, and the sunshine this weekend. The pleasant warm weather this weekend resulted in a sun crust on steep solar (south) aspects. During last week's arctic outbreak, we had 'reverse loading' of storm snow - forming wind slabs on southerly slopes as far down as 1850m in the north (Duffey Lake zone) and 1700m in the south (Coquihalla area). These new, old and variable wind slabs are the primary weaknesses of concern in the snowpack and will likely remain problematic when loaded with the incoming new snow.

Problems

Wind Slabs

An icon showing Wind Slabs
Wind slabs have formed on a wide range of aspects recently. Tune in to patterns of wind loading as you travel and be especially cautious of thin trigger points.
Choose well supported terrain and avoid convexities.Watch for areas of hard wind slab in steep alpine features.Carefully evaluate steep lines for wind slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 16th, 2017 2:00PM

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