Summary
Confidence
Good
Weather Forecast
Saturday: Mainly dry with broken skies, winds moderate to strong from the northwest and alpine temperatures -7.Sunday: Light snowfall, alpine temperatures -9, winds light to moderate from the west and southwest.Monday: Light flurries, alpine temperatures -10, light winds from the west.
Avalanche Summary
The deep persistent slab problem continues to be reactive in the past 3 days up to size 3 with larger triggers such as explosives. Rider triggering is possible especially in shallow snowpack areas like rocky outcrops or near small trees.
Snowpack Summary
Up to 25 cm of new snow from the past 5 days covers stiff, dense wind slabs in exposed lee terrain at and above treeline. Average snowpack depths at treeline elevations are 100-130 cm. In the upper 80 cm of the snowpack a couple persistent weak layers exist, comprising of surface hoar and a facet/crust combo. This interface has produced variable results with snowpack tests, and operators are keeping a close eye on them as the load above increases and/or a slab develops.A bigger concern, especially in the Northern part of the region where the snowpack is thinner and more variable is weak faceted and depth hoar crystals combined with a crust from early October. This is now down around 80-120 cm. This deep persistent weakness may be stubborn to trigger, especially in deeper snowpack areas, but the sensitivity to triggers likely increases in shallower locations, especially on steep, convex, north-facing slopes.
mbender,
Avalanche Canada
