Kentucky Gov. Andy Beshear has declared a state of emergency.

\"We're really concerned about people's safety, especially in the overnight, because when storms or tornadoes hit while people are asleep, that’s sadly when we’ve lost the most people,\" he said in a statement. \"So, everybody out there, be really careful.\"

But the biggest threat from this weather event is the potentially historic rainfall.

\"PHOTO:
ABC News
PHOTO: A dangerous and severe weather threat threatened several states on April 2, 2025, with numerous tornado and severe thunderstorm warnings in effect.
>

Wednesday's severe thunderstorm threat will diminish slightly after midnight, but the threat of severe storms will persist overnight. Then, a life-threatening flash flood threat will begin to ramp up into Thursday morning -- bringing another very active, dangerous weather day for millions.

In Arkansas, the cities of Memphis, Jonesboro and Little Rock are under a moderate risk (level 3 of 4) for excessive rainfall on Wednesday night -- and the flash flooding threat will become more extreme and widespread on Thursday. A rare high risk (level 4 of 4) for excessive rainfall will then go into effect, impacting Jonesboro, Paducah and the Memphis suburbs.

The flooding will last into Friday and Saturday.

The four-day event will leave 10 to 15 inches of rain or more over the bull’s-eye area from Jonesboro to Paducah. Seven to 10 inches of rain is possible from Little Rock to Memphis to Louisville, Kentucky, to Cincinnati.

The system will finally be on the move on Sunday.

ABC News' Jason Volack contributed to this report.

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