Just 11 days after Hurricane Irene prompted area residents to stock up on toilet paper, sandbags and canned goods, those stores might come in handy as the remnants of Tropical Storm Lee arrived on the scene causing flash floods and road closures — including shutting down northbound 14th Street Bridge during rush hour. And forecasters say this isn’t the end of the trouble as the National Weather Service predicts minor flooding in areas along the Potomac River and Rock Creek Park for the next 48 hours. Downed trees are also expected as a result of the rain.