Avalanche Forecast

Issued: Jan 28th, 2013 10:08AM

The alpine rating is high, the treeline rating is high, and the below treeline rating is considerable. Known problems include Storm Slabs.

Avalanche Canada jfloyer, Avalanche Canada

Summary

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Overnight Monday & Tuesday: Moderate Northerly wind backing to strong Westerly. 10 to 20 cm of additional snow with continued cold temperatures (below freezing all elevations).Wednesday: Continued wind: moderate to strong from the west, with another few cm of snow and just slightly warmer (freezing level climbing to 700m or so).Thursday: Winds finally easing off and backing to the SW, continued unsettled with light precipitation and just slightly warmer than Wednesday.

Avalanche Summary

Natural avalanche activity occurred on higher elevation wind loaded slopes up to size 2.5 on Sunday. Loose snow avalanches were also reported running in the storm snow. A skier triggered a slab avalanche at approximately 1200 m on a north aspect in the recent storm snow.

Snowpack Summary

The region has 30-70 cm of new snow which continues to build over a variety of surfaces. It's being drifted into big wind slabs by strong NW wind. These include old hard and soft wind slabs, scoured slopes, blue ice, thin melt-freeze crusts and surface hoar. Moderate to strong winds are shifting snow into slabs in the lee of terrain breaks such as ridges and ribs. Reports generally indicate that the bulk of this storm snow seems to be settling quickly, which is a good. However, with a continued stormy pattern I would wait out the storms and watch how the snowpack adaptsĀ  to the rapid changes.Two persistent weaknesses (comprising of surface hoar and facets) buried in the upper snowpack recently gave moderate to hard, sudden results in snowpack tests. The mid and lower snowpack is generally well settled and strong, although basal facets remain a concern in the north of the region.

Problems

Storm Slabs

An icon showing Storm Slabs
Storm slabs will continue to build at all elevations. Strong NW winds will transport storm snow, and wind-loading will likely trigger a natural avalanches. Avalanches could run near the full length of their path so watch your overhead hazard.
Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.>Be increasingly cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 6

Valid until: Jan 29th, 2013 2:00PM