This is a GoPro video of the start of a tornado that was on the ground for at least 25 miles and for 90 minutes for an average of 16 MPH. Here's the Wiki for it... https://en.wikipedia.org/wiki/Tornado_outbreak_sequence_of_May_22%E2%80%9326,_2016#Solomon/Abilene/Chapman,_Kansas . I took a bit of video of the anvil and surrounding clouds around me. Heck, my buddy and I were even bickering at the beginning of the video and you can hear it if you listen real close. LOL By the end of the day, after realizing how rare it is that we had witnessed such a violent tornado that would later be rated an EF-4, we were fine and made amends.