At least two people were reported to have died as heavy rains soaked the region. More thunderstorms were expected on Thursday.

PITTSBURGH (AP) — A powerful storm downed trees and power lines, leaving more than a half million customers in Pennsylvania, Ohio and neighboring states in the dark on Wednesday morning, with local officials reporting at least three deaths.

The south-central U.S. is facing a "heightened" risk of flash flooding into Thursday following days of deadly storms across a region that's spanned from Texas to the Northeast, the National Weather Service warns.