Moderate to strong SW winds with the storm that ended Dec 19 created wind slabs in specific alpine locations.
40cm of new snow has settled into slabs with the warm and humid weather. These continue to be reactive to tests around treeline where isolated SH has been found.
While this layer still exists in the alpine and should be considered in shallow areas it is mainly TL and below where this sugary snow in the lower snowpack continues to produce moderate shears. Take extra care BTL where this layer is shallow
Deep persistent slabs are best managed by:
Cornices are best managed by:
A bit more cloud with a chance of trace amounts of precip for Monday before skies clear. Cold nights will be the price to pay for sunny afternoons with maybe some light winds reaching -5 C at valley bottom elevations. Watch for the sun to create moist snow on steep SW slopes given these conditions.
Wind slab from SW winds in the alpine where mid-pack facets produce variable moderate to very hard shears down 100cm in deeper snowpack. Isolated SH produces easy shears below storm snow at treeline. Mid-pack facets produce consistent moderate results at Treeline and Below. Solar effects on Steep SW at treeline and more modest angles S-W BTL.
A few deep persistent slabs were observed today both appeared fresh but could be up to 3 days old and were sz 2. SW aspect from 2650m on Mt Ogden failed about 60 deep and 60 wide running about 450m. On the NW aspect of Wapta above Emerald lake 80 deep and 80 wide running several hundred meters. Otherwise evidence of previous loose wet activity BTL.