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

A least two people drowned when their vehicles were caught in floodwaters in Oklahoma on Wednesday as slow-moving thunderstorms inundated roads across parts of that state and Texas, authorities said,

Slow-moving thunderstorms dropped record rainfall across much of southern Oklahoma and northern Texas Wednesday, triggering flash flooding and forcing evacuations, as residents in Pennsylvania and Ohio picked up from a powerful storm that left more than half a million customers in the dark.