Forecasters said heavy rains were expected in a band from eastern Louisiana across central parts of Mississippi and Alabama and into far west Georgia.
NASA released images showing the devastation from the bushfires burning all over Australia.
There were six active storm systems in the Atlantic and Eastern Pacific regions earlier this week, tying a record for the number of combined storms in both areas, according to the National Hurricane Center.
Rain from Tropical Depression Imelda deluged parts of Texas and Louisiana on Thursday, prompting hundreds of water rescues, a hospital evacuation and road closures in areas east of Houston that were hit hard by Hurricane Harvey two years ago.
The storms are wrapping up for the night and as the cold front pushes through, it will bring much cooler weather to Metro Detroit.