Another storm pulse will keep storm slab problems active on Friday. Expect avalanche danger to increase over the day as new snow accumulates.
Another period of snowfall overnight and through the day will keep storm slab problems active on Friday. Warm temperatures will likely promote slab formation in the new snow below treeline while thicker, wind-stiffened slabs continue to build at higher elevations.
Thursday night: Cloudy with continuing flurries bringing 5-10 cm of new snow. Light to moderate southwest winds. Freezing levels remaining near 1300 metres.
Friday: Cloudy with increasing flurries bringing about 15 cm of new snow. Light to moderate southwest winds. Alpine high temperatures around -3 with freezing levels to 1400 metres.
Saturday: Mainly cloudy with isolated flurries and a trace of new snow. Light southeast winds. Alpine high temperatures around -4 with freezing levels to 1300 metres.
Sunday: Broken skies, becoming cloudy with isolated flurries and a trace of new snow. Light southeast winds. Alpine high temperatures around -5.
There have been several reports over the last three days of natural, human and explosives triggered avalanches on all aspects and at all elevation bands. Most of these were size 1-1.5 storm and wind slab avalanches, with a few larger (2-2.5) cornice and explosives triggered storm slab avalanches.
On Thursday, up to 15 cm of new snow (paired with warm temperatures and strong southerly winds) likely led to touchy storm slabs forming in many areas. Similar conditions are expected for Friday.
Regular snowfall over the past week brought around 25-50 cm of snow to the region. Elevated winds and warm temperatures on Thursday mean that touchy new storm slabs were likely forming at higher elevations while melting of surface snow occurred below about 1500 metres. A similar picture is expected for Friday.
A layer of surface hoar buried 80 to 150 cm deep could still be a concern in certain parts of the Selkriks and the northern end of the Monashees. It exists primarily at treeline and below treeline, and though it appears to be gaining strength, it could still be triggered by a large load in some areas.
