Many smaller roads in the area were still closed Friday morning.

"It fell hard and fast," said Corsicana police Sgt. Jimmie Hensley. "We had a lot of street flooding, intersections flooded. We had to rescue several people from their cars."

Businesses in the town flooded as up to 18 centimetres of rain fell in the area. About 60 elderly residents from an assisted living centre were taken to a church on higher ground for safety, said Eric Meyers, Navarro County Emergency Management co-ordinator.

The spring storm unleashed more than 65 tornadoes in Oklahoma, Texas, Kansas, Colorado and Nebraska on Wednesday and Thursday, the National Weather Service said. A twister Thursday afternoon in Oklahoma City injured at least five people - two of them critically.

On Wednesday, the storm system was blamed for four deaths in Oklahoma, Colorado and Texas.

Vance and Barbra Woodbury were killed when a twister blew apart their home near the Oklahoma Panhandle community of Elmwood. In the Texas Panhandle, Monte Ford, 53, was thrown from his trailer after high winds rolled it near an oilfield.

In the hard hit town of Holly, Colo., Rosemary Rosales, 28, died after a tornado as wide as two football fields flung her from her home into a nearby tree. Her three-year-old daughter and husband were among seven people hospitalized.

In Holly on Friday, residents shovelled debris and sawed up fallen trees while utility crews replaced power and telephone poles. A Red Cross truck circulated through the town, offering coffee to the workers.

The same storm system dumped mountains of snow on Wyoming, causing highway pileups and closing large portions of three interstates. Roads there were still largely inaccessible Friday. Up to 180 centimetres of snow fell in the Wind River Mountains area since Wednesday.

About 600 homes in the Buffalo, Wyo., area were without heat and electricity Friday morning, down from about 2,200 across north-central Wyoming on Wednesday.