Dangerous severe storms with possible tornadoes swept across parts of the U.S., including in Texas and Oklahoma, on Saturday night.

Federal forecasters issued tornado watches and warnings for parts of Texas, Oklahoma, Arkansas, Missouri and Kansas, with the National Weather Service office for Fort Worth, Texas, urging residents in the path of unstable thunderstorm cells north of Dallas-Fort Worth to “SEEK SHELTER NOW!!!”

The weather service’s office for Tulsa, Oklahoma, said radar had…