Residents in parts of the South are preparing for the worst.
Forecasters say tropical storm Barry, which is brewing near the Gulf Coast, could become a hurricane.
New Orleans is already experiencing severe flash flooding.
Homes are flooded, people are braving the streets in kayaks, even a goldfish was spotted swimming around in floodwater.
More than 4 million people are already under flash flood watches from Louisiana into the Florida Panhandle.
Officials are urging people who live in the danger zone to start preparing now and not to take warnings lightly.
The storm system, which is expected to develop into hurricane Barry, is slow moving.
If it continues at its current trajectory, it could echo hurricane Harvey in 2017, hovering over one place and relentlessly dumping rain.
In advance of that, Louisiana officials have begun closing floodgates, hoping to counteract the effects of a possible storm surge.