Tornado Evolution

The above image shows a sequence of eight photographs, shot from Sutton Road, about .22-mile south of Central City Road in north-central Linn County Iowa on Monday, September 3, 2018. Though technically all eight photos meet the National Weather Service criteria for a true tornado (circulation on the ground), each photograph shows a different stage of its condensation funnel. This vantage point looks south, with the tornado moving right-to-left in each image, about a mile distant. Time from first to last photograph was from 5:42-5:44 pm CDT. The fully-condensed funnel was on the ground here for less than 30 seconds. This was a cyclic spinup from an unusual tornadic storm on Labor Day. Nikon D7200 DSLR camera.