A warm ridge of high pressure will dominate the weather for the next few days. The temperature inversion formed by the ridge will trap low cloud and fog along the coast and in the interior valleys. The ridge will persist through the weekend. On Sunday an Arctic front will stall on the BC/AB border, then retreat northward on Monday.
On Monday a frontal system will approach the coast of BC. It will bring increasing clouds to the coast but models have been trending slower and weaker in terms of the precipitation Monday night and Tuesday. The GEM-GLB now confines light precipitation to the North Coast Monday night and remains dry for the South Coast as the front splits on Tuesday. The GFS still shows light precip spreading from North to South. In the wake of that system the upper ridge will be much weaker.
Overall confidence is high through the weakening of the ridge Tuesday. Confidence around how far south the light precipitation will spread on Tuesday is low.