The heavy storm has rolled through Vernon, causing a blackout that has affected roughly 2,200 residences.
BC Hydro says crews are being dispatched, and the power is expected to be restored in a few hours.
Environment Canada has issued weather warnings for the Similkameen and Okanagan Valley, saying a strong upper low pressure system over Washington state is moving northeastward through B.C.
The bands of showers and thunderstorms are expected to continue on and off throughout the day, and some areas may see up to 40 millimetres of rainfall.
A thunder-and-lightning storm swept through the province's south coast last night, causing power outages in Metro Vancouver and the Sunshine Coast, and even delaying flights at Vancouver's airport. (CKIZ, The Canadian Press)