Storms, floods, mudslides tie up D.C. areaBy MARTY NILAND, Associated Press WriterWASHINGTON - Flooding from a weekend of heavy rain shut down the Justice Department building, Internal Revenue Service headquarters and the National Archives on Monday, and created a nightmare for commuters with washed-out roads, mud blocking the Capital Beltway and delays on the area's rail lines. District of Columbia officials urged people to avoid the flooded downtown areas. "They need to give us time to make sure everything's OK," said Michelle Pourciau, the acting director of the D.C. Department of Transportation. "We know that more rain is coming ......