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.

Officials reported at least three deaths from Tuesday night's storm in Pennsylvania.

Heavy rains and severe thunderstorms will mean a heightened risk of flash flooding across the south-central U.S. through early Thursday, the National Weather Service said.

Rains drench parts of Oklahoma and Texas

The storms drenched much of southern Oklahoma and northern Texas, flooding and washing out roads and causing flights to be canceled and delayed at major airports.

In Wewoka, Oklahoma, a city of about 3,000 located about 80 miles (129 kilometers) southwest of Oklahoma City, there had already been four water rescues from vehicles by early Wednesday afternoon, said Wewoka Fire Chief Kevin Green.

He said with the ground saturated from previous rains, the creeks were overflowing onto the streets.

“People are just driving through the water - they’re not thinking,” Green said.

In Lexington, Oklahoma, a city of about 2,000 located about 40 miles (64 kilometers) southeast of Oklahoma City, a handful of homes were evacuated Wednesday as floodwaters rose and several streets were closed, officials said.

Oklahoma City set a record on Wednesday with 11.94 inches (30.33 centimeters) of rain in April, surpassing the 1947 mark of 11.91 inches (4.85 centimeters), said Oklahoma State Climatologist Gary McManus.

Meanwhile, he said, Oklahoma was poised to break the 1942 record for statewide rainfall average of 8.32 inches (21.13 centimeters) for the month of April.

In the Dallas area, departures were grounded at Dallas Love Field and Dallas-Fort Worth International Airport for part of the day because of thunderstorms, according to the Federal Aviation Administration. Hundreds of flights were canceled at DFW International Airport and dozens at Love Field, according to FlightAware.

Half a million without power in Pennsylvania, Ohio and neighboring states

More than 425,000 customers were without power in Pennsylvania and another 40,000 were in the dark in Ohio after Tuesday night's powerful storm, according to PowerOutage.us. Neighboring states, including Michigan, New York and West Virginia also reported thousands of outages.

“This is a natural disaster, folks, the level of which we don’t see very regularly,” said Matthew Brown, the emergency services chief for Pennsylvania's Allegheny County.

A spokesperson for Pittsburgh-based Duquesne Light called the storm’s damage “unprecedented” for knocking out electricity for some 250,000 of its customers and toppling trees and snapping power poles. The utility was bringing in outside help to restore electricity, and outages could last a week, the spokesperson said.

Authorities say 2 electrocutions in Pennsylvania are storm-related

A Pennsylvania man was electrocuted on Tuesday evening while trying to extinguish a mulch fire near a utility pole as severe weather hit the State College area, police said. The 22-year-old man died at the scene, police said in a news release. State College police said they believe the man's death to be storm-related.

In Pittsburgh, first responders were called to the South Side Slopes area for reports of a person electrocuted by live wires, and that person died on the scene, according to a Pittsburgh Public Safety Department social media post. The department urged residents to use extreme caution when moving through the city, citing multiple hazards such as downed trees and possible live wires.

Allegheny County officials confirmed that a 67-year-old man was killed by a fallen tree at a home in Ross Township, just outside Pittsburgh.

The National Weather Service’s Pittsburgh office said destructive wind damage was seen across its region. Straight-line winds gusted over 80 mph to 90 mph (129 kph to 145 kph), which is stronger than many EF0 and EF1 tornadoes typically seen in the area, the weather service office said in a social media post.

Teams investigating wind damage in Pittsburgh area

A line of thunderstorms that swept across Pennsylvania on Tuesday night formed what’s called a “bow echo,” or a bow-shaped line of incredibly strong winds that are strongest at the apex of the curve, according to weather service meteorologist John Bowen in State College. Damage was most severe where the apex passed, he said.

Pittsburgh International Airport recorded its third-highest wind gust in modern history at 71 mph (114 kph), according to Liana Lupo, a meteorologist with the weather service's Pittsburgh office. A team investigated wind damage in Wilkinsburg, just outside Pittsburgh, but could not conclusively say a tornado had touched down, Lupo said.

The Storm Prediction Center’s storm report map for Tuesday included tornado reports from Oklahoma and Missouri, dozens of hail reports and more than 580 high wind reports stretching from Oklahoma to New York, including reports of downed trees and power lines and roofs blown off buildings.

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Brumfield reported from Cockeysville, Maryland, and Levy from Harrisburg, Pennsylvania. Associated Press writers Jamie Stengle in Dallas and Sean Murphy in Oklahoma City contributed to this report.

A man and his dog duck behind a truck as the storm hits at Fort Cherry High School in McDonald, Pa., Tuesday, April 29, 2025. (Lucy Schaly/Pittsburgh Post-Gazette via AP)

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Fallen trees from the stormy weather in Regent Square in Pittsburgh, Tuesday, April 29, 2025. (Samara McCallum/Pittsburgh Post-Gazette via AP)

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People leave the school as a storm begins at Fort Cherry High School in McDonald, Pa., Tuesday, April 29, 2025. (Lucy Schaly/Pittsburgh Post-Gazette via AP)

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Fans head up the hill to the parking lots when the game was stopped between California and Fort Cherry High School baseball teams at Fort Cherry High School in McDonald, Pa., Tuesday, April 29, 2025. (Lucy Schaly/Pittsburgh Post-Gazette via AP)

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