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.
Householders across the region have been clearing up again today after more storms and flash flood
Torrential thunderstorms hit much of the Anglia region on Friday and Saturday with reports of frequent lightning and hail showers.
The Anglia region is included in a Met Office yellow weather warning for the risk heavy rain and localised downpours on Friday and Saturday.