Forecasters predict additional rainfall late Saturday, bringing another 1 to 3 inches to the soaked area and increasing the chance of major flooding.

Friday’s fierce storm forced numerous high-water rescues, including some from the roofs of flooded homes. Officials advised residents in low-lying areas to leave, warning that the worst was yet to come.

“This threat is ongoing and will only get worse. It’s not your typical river flood,” said Harris County Judge Lina Hidalgo, the county’s top elected official. She described the predicted water surge as “catastrophic.”

For weeks, torrential rains in Texas and parts of Louisiana have filled reservoirs and saturated the ground. Floodwaters partially submerged cars and roads in parts of southeastern Texas.

According to the National Weather Service, more than 12 inches of rain fell during a 24-hour period ending Friday morning in the northern Houston suburb of Spring.

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