Hurricane Isaac

What remains of Hurricane Isaac has moved away from Louisiana after drenching the state with rain, but the threat of more flooding looms after a southeastern state official said that river waters are expected to crest Monday.

Hurricane Isaac made landfall in New Orleans on the seventh anniversary of Hurricane Katrina, dumping 500-year-flood amounts of rain and leading to rooftop rescues for people in Plaquemines Parish south of the city.

Hurricane Isaac was downgraded to a tropical storm Wednesday but continued to pour rain and produce strong winds in New Orleans.

Tropical Storm Isaac is likely to become a hurricane by early tomorrow, but storm surges and flooding already pose a significant threat, federal authorities warned Monday.

Tropical Storm Isaac is bearing down on Tampa, Fla., altering plans for the 2012 Republican National Convention (RNC), but the big question for political observers is whether Republicans will create their own whirlwind during the historic event.