"Heavy rain is already moving through Louisiana and will continue over the next few days," AccuWeather's Alex DaSilva said.

A tropical disturbance in the Gulf is set to dump heavy rain in the South as the Northeast braces for more flooding. The tropical system in the Gulf has a 40% chance of developing into a tropical depression,

A wet and rainy Florida could soon see even more precipitation in the coming days, according to the National Weather Service, which has warned the Gulf Coast will face a flood-generating system that could form into Tropical Storm Dexter.