Solar triggering of the storm snow is possible with prolonged periods of sun.
Weather Forecast
Monday will be mainly dry, variable clouds and light North winds with cold air. Tuesday, a weak pulse of 2-4 of new snow, the freezing level will rise to 1100 m and winds will remain light from the North.
Snowpack Summary
20 cm of storm snow are developing soft windslab on SE alpine and treeline slopes from moderate NW winds. These new slabs are sitting on previous hard slab and sastrugi. They appear to be bonding well. The now buried hard slab is bridging weak basal facets. 15 cm of storm snow is sitting on sun crusts and facets below treeline.
Avalanche Summary
A couple of small slab avalanches (size 1.5) involving the new storm snow were observe Sunday morning on steep NE facing treeline slopes in the Parkers Ridge area. No other avalanches were observed along the Icefields Parkway. Visibility was excellent.
Confidence
The weather pattern is stable on Monday
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.