Summary
Confidence
Fair - Forecast snowfall amounts are uncertain
Weather Forecast
Overnight and Saturday: Moderate to locally heavy snow – around 10-15 cm by morning and another 15-20 cm on Saturday. Winds are strong from the S-SW. The freezing level may jump to around 1500 m briefly before dropping slightly on Saturday.Sunday: Mainly cloudy with periods of light snow. The freezing level should be near valley bottom and winds are strong from the W-NW. Monday: Cloudy with flurries. The freezing level should jump to around 1400 m and winds remain strong and gusty from the W-NW.
Avalanche Summary
There have been a few different close calls with large avalanches in the north of this region in the last three weeks. Check out the
incident database for more details. Reports from the last 4 days indicate several natural cornice triggered avalanches running to size 3 on east and southeast aspects at treeline and above.
Snowpack Summary
Up to 20 cm of new snow sits on a variety of snow surfaces ranging from stiff wind slab, a soft layer of facetted snow and/or surface hoar. These sit on top of old wind slabs and a couple of persistent weak layers that exist in the upper meter of the relatively thin snowpack. The mid December surface hoar is buried around 30-90 cm. The early December facet/crust combo is buried down 50-150 cm. Both interfaces give variable results with snowpack tests, but professional operators are treating them with caution.A bigger concern, especially in the Northern part of the region is a layer of weak sugary depth hoar crystals at the base of the snowpack that lie above a crust from early October. Several large avalanches in the last two weeks have been attributed to failures at this layer. Wide propagations on relatively gentle terrain have been noted, as well as a tendency for seemingly disconnected slopes to become connected by one large avalanche.
Peter,
Avalanche Canada
