Morning fog gave way to a warm, muggy Thursday that could see some showers, said Juli Marquez, Bay News 9 meteorologist.
Dense fog covered Tampa Bay with an advisory in effect until 10 a.m. Visibility was down to a quarter-mile, said Jennifer McNatt, a meteorologist for the National Weather Service.
In most places, including Hillsborough County, there were many patches of fog.
Friday will be warmer with temperatures in the mid 70s. There's a 40 percent chance of rain for Saturday morning and afternoon, Marquez said.