Moore, Okla. tornado development, May 20, 2013. (Chance Coldiron and Justin Cox via YouTube)

Watch the Moore, Okla tornado transform from a small funnel to an unfathomable wrecking machine. All in the course of just 3-6 minutes.

Video posted to YouTube by Justin Cox.

Here’s Justin Cox’ description of the video:

Raw footage of Fast Unit 70’s (Chance Coldiron & Justin Cox) coverage of the Moore tornado that was used by KOCO5 during the event on May 20th, 2013. We watched as the tornado formed in front of us and rapidly intensified then moved across highway 37 in Newcastle, OK. Then the tornado continued to intensify as it tracked across the Canadian River and the interstate 44 bridge. The monster tornado was filmed from close range off the I-44 bridge north of Newcastle as it was headed for Moore.