Mountain Weather Forecast

Summertime Convection

Cloud cover over the central interior with showers near Bella Coola this morning as BC is at the tail end of the upper trough. Impacts associated with the showers this morning with be negligible. Convective showers will also develop over the southern half of BC this afternoon with more widespread precipitation expected near Blue River. Moving into this evening, areas west of Kamloops could see impactful thunderstorms with hail and heavy downpours possible. As Saturday night progresses, so too does the cloud cover for the southern third of BC. This is associated with an upper low stationed over Washington/Oregon's coastline. As it creeps closer, showers will develop Sunday morning, followed by rain at times heavy in the afternoon over the Lower Mainland. Confidence is increasing in high precipitable amounts (up to 35 mm by Monday morning) over the Whistler region.

As conditions ease (not by much) Sunday night, the next pulse will move through southern BC on Monday bringing heavy rain to southern BC Okanagan and surrounding Basins) and Whistler again. Here the upper low will be just south of the Canada-US border but will bring rainfall with embedded thunderstorms. Therefore precipitation could be enhanced where thunderstorms occur.

Precipitation will taper off to showers Tuesday before the upper low exits the region Tuesday night.

Guidance is currently struggling to find the high rainfall areas but has displayed a good census that widespread precipitation over southern BC is likely.

1 of 0
Active Mountain Weather Forecast image loop for

The 500 mb animation shows a weak upper trough over central BC. The showers associated with the upper trough will be weak and primarily near Bella Coola. A weak north-south orientated ridge will be set over the southern third of BC and therefore isolated showers will be primarily located over central BC as the upper low is not strong enough to break down the ridge.

A cut-off upper low over the BC coast will move towards the Washington/Oregon states on Sunday. As it tracks inland it will reorientate its position north towards southern BC, bringing rain Sunday and Monday, then tapering to showers Tuesday before the upper low finally moves out Wednesday.

Forecasts and graphics produced by the Meteorological Service of Canada (MSC)