Heavy downpours in South Texas washed out highways and stranded motorists Tuesday as forecasters warned that a threat of more severe weather could bring dangerous flooding to already drenched counties near the border with Mexico.

Storms dumped up to a foot of rain in some rural areas of Texas, leading to dozens of high-water rescues across the region and officials shutting down portions of a busy highway for hours near Uvalde, about 80 miles (129 kilometers) west of San Antonio. A flood watch also included Kerr County, where catastrophic flooding last year along the Guadalupe River killed more than 100 people.

No deaths or injuries Tuesday were immediately reported.

The National Weather Service warned that storms overnight could dump more than a foot of additional rain to some places into Wednesday, creating potentially catastrophic impacts from flash flooding in areas west of San Antonio. Texas Gov. Greg Abbott issued a disaster declaration for dozens of counties.

“Intense rain rates and compounding effects from multiple rounds of storms will result in a dangerous flash flooding threat through Thursday,” the National Weather Service said.

Authorities on Tuesday posted videos of a rescue crew in a boat down flooded streets and one vehicle being swept away by fast-moving waters. Five people were rescued by members of the Texas Game Warden Search and Rescue Team and four were rescued by a local game warden, said Maggie Berger, a spokesperson for the Texas Parks and Wildlife Department.

In Uvalde, officials said there had been at least two dozen water rescues. They opened a local event center for anyone displaced by flooding. In Sabinal, officials were also making plans for a shelter.

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