Avalanche Forecast
Issued: Dec 23rd, 2011 8:49AM
The alpine rating is Wind Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Fair - Intensity of incoming weather is uncertainfor the entire period
Weather Forecast
Saturday: 3-5cm of snow - moderate to strong southwest winds - Freezing level at 1200mSunday: 8-12cm of snow arriving late in the day - moderate southwest winds - freezing level at 800mMonday: 8-12cm of snow - light to moderate southwest winds - freezing level at surface
Avalanche Summary
Fresh wind slabs and cornices are sensitive to human-triggers A size 2 windslab was ski cut yesterday on Vantage Peak on the Duffey Lake area (alpine elevation band-northeast aspect)
Snowpack Summary
Dribs and drabs of new snow, in the Coquihalla area, with associated winds are keeping wind slabs fresh and poorly bonded, but also keeping recent surface hoar development and distribution to a minimum. While in the Duffey Lake area, wind-exposed slopes are predominately scoured and pressed, with pockets of hard wind slab. Buried surface hoar and/or facets persists 10 or so centimetres below a weak rain crust on sheltered treeline slopes and below, where recent compression tests on a northerly aspect at 1750m produced easy sudden results down 20cm on surface hoar as large as 15mm. The mid and lower snowpack are generally well-settled and strong, but recent reports suggest basal facets create a deep persistent slab problem that deserves caution in shallow snowpack areas on planar rocky slopes.
Problems
Wind Slabs
Aspects: North, North East, East, South East.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 24th, 2011 8:00AM