Avalanche Forecast

Issued: Jan 9th, 2013 9:02AM

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

Avalanche Canada Peter, Avalanche Canada

Summary

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: A ridge of high pressure will build in for Thursday. The ridge is interrupted on Friday as a weak disturbance pushes through. Thursday: Mainly sunny. Light northwest winds. Freezing level at valley bottom.Friday: A chance of flurries or light snow. Light northwest winds. Freezing level at valley bottom.Saturday: A mix of sun and cloud. Freezing level remains at valley bottom.  

Avalanche Summary

There is one new report of a skier controlled size 2 avalanche in the northern part of the region. The slide released on a steep convex roll below treeline and likely failed on the late December persistent weakness.

Snowpack Summary

50-100cm of storm snow has fallen in the past 10 days or so. Weaknesses exist within and under this recent storm snow including touchy surface hoar and/or facets from the end of December under it all. Recent strong southwesterly to easterly winds have set up wind slabs in many exposed lee areas. A deeper surface hoar layer was buried at the beginning of December and is now down well over a metre, but there are no recent reports of activity on this layer. Near the base of the snowpack, a crust/facet layer continues to concern local avalanche professionals. This weakness is unlikely to be triggered by a single person, but it remains possible with a very heavy load (e.g. cornice fall) or from a thin-spot trigger point.

Problems

Persistent Slabs

An icon showing Persistent Slabs
A weak layer of surface hoar and/or facetted snow exists under the recent storm snow and has been susceptible to human triggering.
Choose well supported terrain without convexities.>Whumpfing is direct evidence of a buried instability.>Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

2 - 5

Valid until: Jan 10th, 2013 2:00PM

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