- 4 updates
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.
Torrential downpours and thunderstorms are currently tracking across Northamptonshire and into Cambridgeshire and Norfolk, heading north east towards The Wash.
Areas on the rainfall radar map coloured white indicate rainfall rates of more than 32 mm per hour.
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Thunderstorms have brought torrential rain to many parts of Suffolk.
This video by Dionne King was taken in East Street, Sudbury. She reported that 20 homes had been flooded in the area.