Union City, OK May 24, 1973

[Randall Bragg]

This tornado was historic because it was the first one that was filmed from beginning to end. It was a milestone for the NSSL. It showed the 4 stages from development to end and this chase was planned by storm chasers for this purpose. There are several archived videos and discussion about it on YouTube and other sites.
Check it out !!!

 

[Mike Johnston]

It not only was filmed, it was very well documented overall. It was a case study for tornadoes and researched for years afterwards.