Thunder and lightning hit the north valley this week and flashing, booming skies could continue through Saturday evening.

“There’s an unsettled pattern, we do have a large trough of low pressure over the West Coast right now,” said Karl Swanberg, a forecaster with the National Weather Service’s Sacramento office. “These enhanced features, they just rotate around the low pressure, so you get little waves of energy bringing a chance of showers and in your area, thunderstorms.”