Severe storms across the southern plains brought heavy rain, damaging winds, and thunder so loud some people in Oklahoma thought it was an earthquake.
Forecasters said the slow-moving storm system could cause more flash floods, hail, strong winds, and possibly tornadoes in a corridor stretching from Texas to Louisiana and as far north as Missouri.
Storms rattled Tulsa, Okla., early Tuesday morning with thunder so loud and strong that it registered on seismic equipment.
"We have seen quite a bit of thunder on all of our seismic stations across the state," Austin Holland, a research seismologist with the Oklahoma Geological Survey, told The Associated Press.
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"We can confidently say there were no earthquakes large enough to be widely felt," he added.
The National Weather Service issued tornado watches Tuesday for parts of Arkansas, Texas and Louisiana, with tornadoes touching down in some areas.
In Devine, Texas, a twister tore the roof from a house.
Flash flooding caused by heavy downpours turned rural roads into rivers. Seven states from Oklahoma to Mississippi have been under flood warnings this week.
A Texas woman was killed when her car hydroplaned into an oncoming pickup truck.
In Mississippi, the storm toppled trees and power lines.
Strong winds also caused extensive damage in the town of Morrilton in central Arkansas. The city parks complex was destroyed, along with the concession stand and exhibit buildings, at the Conway County Fairgrounds.
"A transformer is sitting in the middle of somebody's driveway," Morrilton Mayor Steward Nelson said.
"We got the ceiling falling down and then the rain pours in," explained Morrilton resident Robbie Bane about the storm damage to his house.
Forecasters say the storms are typical in the region during March. They expect the storms to taper off in the next few days.