Avalanche Forecast
Issued: Jan 31st, 2012 9:25AM
The alpine rating is Storm Slabs, Wind Slabs, Persistent Slabs and Cornices.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Good - -1
Weather Forecast
Wednesday: Another 5-10cm expected with light to moderate southwesterly winds and freezing levels around 1000m. Thursday and Friday: Clear and dry with significant warming by Friday and moderate northwesterly winds becoming light and variable.
Avalanche Summary
Several natural and slope-cut step down slab avalanches Size 2 to 3.5 associated with the mid-January persistent weakness as deep as 150cm occurred on Monday. Check out the incident database (link under the Bulletins tab) for a report of a slope-cut stepping down to the mid-January facets in the Monkton Creek area near Barkerville. The recent storm snow also remains sensitive to human triggers with several Size 1 to 2, 30-40cm thick slab avalanches.
Snowpack Summary
Total snowpack depths are well above average or even new record depths for this time of year. Recent warm temperatures and upside-down storms created a touchy surface slab. Other weaknesses within and under the 150+cm of recent storm snow create the potential for step-down avalanches, but things seem so be settling rapidly. Moderate southerly or southwesterly winds have created wind slabs and large fragile cornices in exposed lee and cross-loaded terrain. Snowpack test results on the mid-January persistent weakness range from no result where it's deeply buried to moderate sudden where it was found as facets overlying a crust down 80cm. This, as well as recent avalanche activity, suggests large persistent slab avalanche that propagate across entire slopes could be triggered, especially by step-down avalanches and cornice falls in shallow snowpack areas.
Problems
Storm Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Wind Slabs
Aspects: North, North East, East, South East, South.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Cornices
Aspects: North, North East, East, South East.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Feb 1st, 2012 3:00AM