The relentless rain also caused a dam to fail, creeks to overflow and roads and highways to close across the state.

Slow-moving thunderstorms across parts of Oklahoma and Texas flooded roads and forced evacuations on Wednesday as residents in Pennsylvania and Ohio picked up from a powerful storm that left more than half a million customers in the dark.

Two people died after their vehicle was trapped in floodwaters and one person was killed in a tornado, officials said. Severe weather threatened parts of Arkansas and Missouri on Sunday.