Avalanche Forecast
Issued: Dec 30th, 2013 9:13AM
The alpine rating is Wind Slabs and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Good
Weather Forecast
Tuesday: Dry, mostly cloudy with some sunny breaks. Treeline temperature around -3C. Ridgetop winds aronud 35 km/h from the W or NW.Wednesday: Dry, cloudy with some sunny periods. Temperatures starting cold but rising to around -3C in the afternoon. Winds around 30 km/h from the NW.Thursday:Â Precipitation becoming steadily heavier through the day. 5-10 cm expected. Temperatures rising in the afternoon to around -1C. SW winds up to 80 km/h.
Avalanche Summary
A few slab and loose avalanches to size 1.5 have been reported in the last 2-3 days. These are isolated to the most recent storm snow.
Snowpack Summary
Recent moderate to strong southwesterly and northwesterly winds continue to build wind slabs on exposed alpine and treeline slopes. 30-50 cm of recent storm snow sits on a weak layer consisting of surface hoar crystals, stellar crystals and/or crust. Around 60-90 cm below the snow surface, the early December surface hoar, facetted snow, and/or a crust interface sits and is reportedly still variably reactive in snowpack tests.The late-November persistent weak layer consists of a sun crust on steep south facing slopes and surface hoar in sheltered areas. It is now buried 80-110cm below the surface. Snowpack tests vary on this interface with some results producing "sudden" shears and others producing no results. This interface is generally considered to be dormant. However, professional operators are still keeping a close eye on it.A weak layer of facets sitting on a crust that formed in October, sits near the base of the snowpack. This layer is predominantly found on north-facing alpine slopes with smooth ground cover. Triggering this weakness is unlikely, however if triggered the resulting avalanche would potentially be a large event with high consequences.
Problems
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
Valid until: Dec 31st, 2013 2:00PM