(CNN) -- Heavy rain and flooding stranded motorists along a stretch of U.S. Highway 69 in northeast Oklahoma, and authorities had made more than 15 rescues by midday, a police spokeswoman said.
Cpl. Susan Greninger said the highway was closed in the Pryor area, which received about 5 inches of rain over several hours, resulting in water more than 4 feet deep in low-lying areas. Pryor is about 30 miles east of Tulsa, Oklahoma.
Roadways also were closed between Pryor and Claremore to the west.
"We have had torrential rains since about 6 o'clock this morning. We started water rescues right around 9 o'clock," Greninger said.
Greninger said water was flowing toward neighborhoods and business districts, where more rescues were under way.
"Resources are available, and everybody is willing to help," she added.
A secondary front of wet weather was developing to the west, between Interstate 35 north of Oklahoma City and I-44 near Pryor, CNN meteorologist Reynolds Wolf said.
Rain is expected into Saturday and also could drench Texas and parts of Missouri and Arkansas, Wolf said.
It takes only about 18 inches of water to lift and push a vehicle downstream, Wolf said.