Mapleton Tornado

Thursday, April 9 is the 4th anniversary of the EF-3 Mapleton, IA tornado. I have video from Onawa, IA from 6:43 - 6:56 PM CDT - about 40 minutes before Mapleton was hit - of what may have been the beginnings of the Mapleton tornado:

From just east of Onawa, on highway 175, from 7:00 - 7:03 we saw a circulation cross the road to our west:

I have plenty of video from this storm, and we only saw the tornado after dark, so I made a slideshow to show how it all evolved: