If heavy precipitation continues overnight danger ratings may be higher than forecasted. Check out the
South Rockies Blog for more information on current snowpack and avalanche conditions.
Summary
Confidence
Poor - Timing, track, or intensity of incoming weather system is uncertain
Weather Forecast
Precipitation should taper off Friday night as a more stable northwesterly flow develops over the East Kootenays, though freezing levels will remain elevated. A return to a more active south westerly flow should happen Saturday night bringing the chance for more precipitation and continued warm temperatures. There is the possibility of Chinook conditions developing on the eastern side of the Rockies starting on the weekend.Thurs and overnight: Up to 7 cm with strong SW winds tapering off overnight. Freezing levels should drop from 1700m to 1100m overnightFri: Cloudy with possible sunny breaks, moderate ridgetop winds from the west, freezing levels 1600mSat: Precipitation developing later in the day, moderate west winds with freezing levels to 1600mSun: Moderate accumulations of rain/snow possible, freezing levels to 2000m
Avalanche Summary
The South Rockies team reported a size 2.5 avalanche out of a north facing chute near Grave Lake that left 6 meters of debris on a logging road, blocking their return to the trucks. They also saw several size 2 slab avalanches out of west facing below treeline terrain near Sparwood. Natural avalanches up to size 2.5 with crowns over a meter deep are being reported from N to NE aspects in the neighboring Lizard Range at treeline and alpine elevations. Below treeline numerous loose wet slides up to size 2 happened on Thursday in areas where the snow became rain soaked.
Snowpack Summary
Some areas of the South Rockies (Elk Valley South and Flathead) received Thurday's precipitation as significant rain event below 1800m. In areas above 1800m there is between 30-60cm of new storm snow sitting on top of the March 2 interface consisting of surface hoar, facets or a crust depending on your aspect and elevation . Moderate to strong SW winds combined with the new snow have created windslabs in lee features and have likely contributed to cornice growth at upper elevations.The mid pack still contains a layer of facets and/or surface hoar that is now down an average of 110cm. It is still showing good fracture character on snowpack tests, suggesting that it may be possible for storm slabs to step down to this persistent weak layer in areas that haven't avalanched in the previous late February cycle. Check the
South Rockies Blog for the latest snowpack discussion.A weakness at the base of the snowpack may still exist in isolated areas of the region but triggering this layer is unlikely.
jcoulter,
Avalanche Canada
