Wind loading is expected on southerly slopes from strong northwest wind, which is not the typical pattern for the region.
The persistent weak layer may still be possible to trigger in areas that have not already avalanched. Be especially cautious in these places.
A widespread weak layer consisting of a crust, with facets and/or surface hoar on top of it is now down about 80-150 cm. This layer may still produce large avalanches in areas that have not already avalanched.
Fresh storm slabs are may be easy to trigger, especially in wind loaded areas at higher elevations. Be aware of the potential for wind loading on southerly aspects with strong northerly winds in the forecast.
WEDNESDAY NIGHT - Mainly cloudy / moderate northwest wind / alpine low temperature near -3 / freezing level 700 m
THURSDAY - Mainly cloudy with a few flurries, 3-5 cm / moderate to strong northwest wind / alpine high temperature near -2 / freezing level 600 m
FRIDAY - Mainly cloudy / strong northwest wind, easing to moderate in the afternoon / alpine high temperature near -1 / freezing level 1000 m
SATURDAY - Mainly cloudy with scattered flurries, 3-5 cm / strong west wind / alpine high temperature near -2 / freezing level 900 m
Human triggered avalanches remain likely in wind loaded areas at upper elevations. The recently buried persistent weak layer may be possible to trigger in areas that have not already avalanched.
A widespread natural avalanche cycle, with avalanches up to size 3, took place on Monday night. Most of these avalanches failed on the persistent weak layer. This was likely the peak of the avalanche activity in the region.
It was a busy week for avalanche activity in the South Coast mountains, with natural and/or human triggered avalanches reported every day between Monday, January 25, and Monday, February 1. Most of these avalanches failed on the persistent weak layer that was recently buried.
North Shore Rescue responded to a serious, but non-fatal avalanche incident last Tuesday evening near Cypress Mountain Resort. One person was involved and was partially buried. The avalanche was a size 2 storm slab on a west aspect at approximately 1100 m and failed on the persistent weak layer.
There is about 80-150 cm of snow sitting on a widespread persistent weak layer. This weak layer consists of a crust that also has weak facets and surface hoar on top of it in many areas. This layer has been taking more time to gain strength than what is considered typical for the South Coast region.
Click here to watch North Shore Rescue's January 29 snowpack discussion, which illustrates this concerning snowpack structure.
