Eyewitness Vikki Woodford said she saw the tornado touch the ground at Wortwell on the Norfolk-Suffolk border.
Vikki wrote on the ITV News Anglia Facebook page: "I have pictures of it from Wortwell - very clear! We watched it touch down, videoed it then left before the storm was overhead."
She added that it then fizzled out.
There are no reports of any damage.