Scattered showers and thunderstorms this afternoon to evening, focused on areas south of Tucson. More widespread storms expected this weekend. During severe weather it's important to keep in mind these safety tips: When you hear thunder or see lightning, head to shelter like a home or a car; during a sever thunderstorm head into an interior room on the lowest floor; when there is water crossing roadways do not drive through it, turn around and find an alternate route.