Avalanche Forecast
Issued: Jan 12th, 2018 4:10PM
The alpine rating is Wind Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
Low - Due to the number of field observations
Weather Forecast
SATURDAY: Cloudy with light snowfall, accumulation 5 to 10 cm, light to moderate southwesterly winds, alpine temperature -2 C but colder in the valleys, freezing level below valley bottom with inversion conditions.SUNDAY: Mostly cloudy, moderate to strong southerly winds, alpine temperature near 2 C, inversion conditions with cold valley air and above-freezing level between about 1500 m and 2500 m.MONDAY: Mostly cloudy with intermittent precipitation, accumulation 1-3 mm, moderate to strong southerly winds, alpine temperature near 2 C, inversion conditions with cold valley air and above-freezing level between about 1000 m and 2500 m.
Avalanche Summary
Skiers were able to trigger pockets of wind slab on north-to north-west facing slopes on Tuesday and Wednesday.
Snowpack Summary
Variable winds have built slabs on many different slopes, primarily in the alpine but also in lee features at treeline. Recent snow (around 20-30 cm) overlies various surfaces including a freezing rain crust (which was reported as being hard in the alpine and breakable below treeline), old sun crusts and wind slabs.A variable weak layer that formed in mid-December can be found in the upper snowpack. This mid-December layer is comprised of crusts on solar aspects and feathery surface hoar in sheltered locations.The lower snowpack is generally well-settled with two prominent crusts. The late-November crust can be found 30-50 cm below the surface and the October crust is near the base of the snowpack.
Problems
Wind Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 13th, 2018 2:00PM