After a second-class hurricane, the tropical cyclone weakened its power and landed in the United States, resulting in heavy rain.
In particular, the state of Louisiana has seen more than 30 centimeters of precipitation.
Some areas of southwest Louisiana rained about 43cm, and flood and flash flood warnings were imposed on parts of the Mississippi and Tennessee River valleys.
Louisiana Governor John Bell Edwards tweeted that Delta "has left a trail of dangers such as flooded roads, power lines that have been shut down, and wild animals out of their habitat."
At the same time, they warned the residents to stay alert.
Some 700,000 households and businesses were cut off on the coast of the Gulf of Mexico, and Governor Edwards said 25 percent of the people who use electricity and gas are out of power.
The Storm Prediction Center has issued a tornado warning order to 3 million people in western Georgia and the Greater Atlanta area, eastern Alabama, and northwest Florida.
However, by the 11th, the delta is expected to weaken to the low pressure zone.