A rare interaction between two tropical storms could happen soon in the Caribbean. An unnamed storm, likely to become Imelda, is heading toward the South Carolina/North Carolina border. It could bring heavy rains and flooding early next week. However, Hurricane Humberto might influence Imelda’s path. It could pull the storm east, apart, or even merge with it. The most unusual possibility is the Fujiwhara Effect, where the storms swirl around each other. Experts say Humberto’s movement is key. The National Oceanic and Atmospheric Administration is closely monitoring the situation.