'Downtown is a mess,' mayor says, urging residents to stay home
                                
                                
                                    (Newser) -
                                    Fast-moving thunderstorms pummeled southeastern Texas on Thursday for the second time this month, killing at least four people, blowing out windows in high-rise buildings, downing trees, and knocking out power to more than 900,000 homes and businesses in the Houston area. Officials urged residents to keep off roads, as...