Kootenay Boundary

The influence of solar radiation could be very dramatic for areas that see a lot of direct sunshine. Expect variability through the region.

Poor - Timing or intensity of solar radiation is uncertain

For Sunday: flurries, which could be heavy at times, but will likely be mixed with sunny breaks. Freezing level around 600 m. Winds light southeasterly. On Monday, the region should see more sunshine, although the occasional flurry is still possible. Gusty southerly winds are expected. On Tuesday, a significant storm arrives around midday, bringing in the region of 20 cm new snow. Freezing levels look as though they will stay around 600 m. Winds will be strong southerly as the storm builds and southwesterly as it moves through and in its wake.

On Friday, ski cutting produced avalanches down 25 cm in the recent storms snow. On Thursday, numerous large avalanches were noted on all aspects from 1600 to 2200m. In the Boundary region, avalanches were only noted in the storm snow. However, just to the north of the region, a size 4 avalanche as well as a couple of size 3 avalanches were observed, which stepped down to lower weak layers. On Wednesday, ski cutting and explosive testing produced avalanches up to size 2.5 on a variety of aspects. Just to the north of the region, a vehicle triggered a size 2.5 avalanche in the recent storm snow. On Tuesday, several large (size 2.5) fracture lines in commonly skied areas at Kootenay Pass were observed following an intense wind event. On Monday, natural avalanches up to size 2 occurred in response to storm snow loading; ski-cutting to size 1.5 was also reported. This activity continues a very active period of avalanche activity that has been ongoing since early March.

Rain fell to around 2000 m on Thursday afternoon and froze into a crust on all aspects below this elevation. Around 10 cm new snow now sits above the crust. The previous storm snow overlies a sun crust on southern aspects and maybe a spotty 2 - 6mm surface hoar on north and east aspects, down around 60 cm. Below that, the more significant early February surface hoar is down 80 - 140cm. Snowpack tests show moderate to hard forces generating sudden planar shears on this layer. Below the early February surface hoar layer, the snowpack is strong in most places. Cornices are growing and would act as a significant trigger for all the layers mentioned above if they drop.