A man has spoken of his horror at hearing his wife's screams as she was swept away by a tornado while driving home from the hairdresser.

Texan man Ruben Porras was speaking to his wife Petra Ruiz Porras on the video chat service FaceTime when the killer tornado struck.

The mother of four children, aged two to nine, was driving home from a hairdressing appointment in Dallas that Mr Porras had booked as a Christmas surprise.

"We were just talking about dinner, and all of a sudden she started screaming," he told CBS News.