Heavy showers fell in San Diego early Wednesday, the third day of a storm system spurred by tropical weather moving north from Baja California. The storm, according to NBC7’s Whitney Southwick, will weaken by late morning producing just partly cloudy skies for the afternoon in most areas.The exception could be some possible thunderstorms in our local mountains.Conditions will feel tropical, rain or not; muggy and hot with 70s at the coast, 80s valleys, 60s in the mountains and low to mid 90s in the deserts.