- Publié à
- 04:00 PDT/PST
- Créé par
- Jon Snow, Paular Vortex, Heart of Winter
Setting the Stage
- A cold front associated with a low in the Northwest Territories moves across British Columbia today and tonight bringing snow and coastal rain
- A second low approaches the Gulf of Alaska tonight and develop into a more potent storm on Saturday bringing heavy snow and gusty winds to the province late Saturday into Sunday
- A brief reprieve on Monday with colder temperatures
- Some upslope snow over the Alberta Rockies on Monday with convective flurries elsewhere in southern British Columbia under a colder and unstable airmass
An upper ridge of high pressure lying west-east over southern B.C. and the southern Rockies will result in dry conditions this morning. An upper trough over northwest B.C. is set to move across and squash the ridge today. As it does, it will open up a west to northwest flow to the northeastern Pacific allowing weather systems to move into B.C. and Alberta.
On Saturday, an upper trough over Alaska deepens and drops into the Gulf of Alaska. The 1000-500mb dashed lines tighten as the upper low deepens and taps into cold air. As the upper ridge is out of the way, this upper low has the ability to bring a large cold airmass into B.C. by late Sunday. As it deepens, an upper cold front develops over the central interior of B.C. Sunday afternoon. With diffluence aloft, this sets the stage for potential convection Sunday afternoon of the central interior between Quesnel and Kamloops and Blue River.
As the upper trough departs on Monday, a cold airmass settles over the province. Weak upper ridging downstream of another upper trough but judging by the colours of the 1000-500mb thickness lines, the airmass will remain fairly cool.