A supercell thunderstorm formed near Iowa City, Iowa and moved East along Interstate 80 and produced a funnel cloud for a few minutes.

Scene 1: Funnel quickly appears near West Branch, Iowa

Scene 2: Funnel persists at half way down

Scene 3: Funnel dissipates slowly

Scene 4: Storm structure over open corn fields

Scene 5: Incredible storm structure as we crest a hill

Scene 6: A vertical pan showing the impressive storm structure

Scene 7: Wide shot of the mesocyclone