Flash flood warnings were in effect for much of the Houston region, where torrential rains prompted officials to close some schools and delay opening of many others on Wednesday.
PHOTOS: Floodwaters wreak havoc on Houston roadways
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Public transportation was delayed or suspended for several hours in the area. Click here for a full list of closings and delays.
Flood waters swallow 288 near downtown
State Highway 288 was hit particularly hard, and some motorists were stranded for up to five hours as they waited for floodwaters to recede.
VIDEO: Traffic lets up on SH-288
Traffic lets up after morning floods
In southwest Houston, a good Samaritan jumped into action and rescued a driver and two passengers of a METRO bus and two other drivers stuck in rising water.
Exclusive video shows Carlos Castellanos walking through high water approaching the METRO bus. The bus driver starts to climb through the driver's side of the window as Castellanos tries to help her out.
Forecasters say some metro areas received more than five inches of rain overnight. Rainfall earlier in the week left the ground saturated and created prime conditions for street flooding.
Houston fire officials say they've received more than 65 calls for high-water rescues, primarily from motorists stranded along flooded roadways.
Emergency management officials in the city of 2.2 million residents asked people to avoid travel on Wednesday.
VIDEO: Floodwaters cover I-45 northbound at N. Main
I-45 northbound street flooding at N. Main
Heavy rain and lightning also hit in the region extending from San Antonio to Austin, while North Texas was experiencing scattered showers.
The Associated Press contributed to this report.