The last storm was very reactive, and now the new storm is adding to the load above the same weak layer. I suggest conservative goals and a day of watching what happens from safe lines.
Confidence
Fair - Forecast snowfall amounts are uncertain on Sunday
Weather Forecast
Overnight and Sunday: Snow fall is expected to continue into the night and then taper off by late morning. Expect 20-30 cms total at treeline with moderate West winds and strong gusts during the snow fall. A weak ridge of high pressure is expected to fill in behind the trough, shifting the winds to moderate Northerly with strong gusts.Monday: The weak ridge is expected to flatten out and let the next trough move inland from the coast. Expect mainly cloudy skies and light precipitation with light Westerly winds and the freezing level rising up to about 1000 metres.Tuesday: The next weak trough is expected to bring another pulse of precipitation to the region, combined with light West winds and slightly cooler temperatures.
Avalanche Summary
Reports suggest that the recent storm slab settled under warm temperatures and continued to be reactive to ski cuts. There were several accidental releases in the storm slab up to size 1.5 that were about 20 cms deep. There were some natural avalanches from steep mid elevation paths along the highway corridor. There was one natural cornice release that stepped down to the January 23rd layer that was down about 80 cms and was reported to be size 2.5.
Snowpack Summary
New snow is adding to the recent storm slab that is between 15-30 cms across the region. This new load is expected to create another cycle of wind slab releases in the alpine and treeline, and may cause the recent storm slab to become more reactive where it is sitting on the weak surface hoar layer that was buried on February 12th. The recent storm slab has also been reactive on Southerly aspects where a sun crust formed during the period from February 8th-11th. Loading on the recent storm may cause another cycle of natural activity, or an increased sensitivity to human triggers. There are older weak layers that are now buried down around 70-80 cms and also at about 110 cms. These layers have been unlikely to trigger by skiers, but they may still be sensitive to large loads like avalanches in motion or cornice fall.
Problems
Storm Slabs
Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
Wind Slabs
Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.
Persistent Slabs
Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.