Lots of light snow, combined with lots of wind, will cause new slabs to develop. Combine those hazards with the Christmas ski crowd and managing risk and exposure can be challenging. Remember that people might be above, or below you!
Summary
Weather Forecast
Today should be mostly cloudy with flurries bringing up to another 5-10cm. This will add to the ~30cm available for moderate to strong SW winds to transport and load lees. On Thursday, the next storm arrives dumping another ~20cm with gusty SW winds. By Friday the storm will start to taper off, with more flurries and gusty winds.
Snowpack Summary
Another 30cm of snow overnight, combined with strong SW winds, is building a new storm slab. It overlies surface hoar that was observed well into the alpine. Last weeks storm snow is settling into a stiffer slab, and the facetted Dec.18 layer is now down ~1m. Natural and skier triggered slabs on this layer have been observed recently.
Avalanche Summary
Yesterday skiers reported triggerable windslabs on a SW aspect at 2100m on McGill, and there were several size 2 and a size 3 natural avalanche from steep paths east of Rogers Pass. On Monday, a
size 2 skier-triggered avalanche from steep, shallow, unsupported terrain carried a person over a large cliff and resulted in a rescue.
Confidence
Intensity of incoming weather systems is uncertain