 That is CBS News correspondent Janet Chamblee in reporting this morning. For the second time in weeks, and the fourth time actually in two years, the first official swim event in the Anacostia River here at home has been called off. This time because of Tropical Depression Barrel, which is threatening our region with storms this coming weekend. Organizers telling the Washington Post this week that thunderstorms predicted at the end of this week prompted Saturday's swim to be postponed.