Tim Marshall posted this on the forum 

:
I want to make everyone aware that Jimmy Deguara has set what I 
believe is the LONGEST CHASE EVER on record. On April 14-15, he flew from 
Sy  dney, Australia to Dallas-Fort Worth, rented a car, took a 4 hour nap, then 
drove all the way to Beatrice, NE to film two tornadoes. I don't know the 
F-scale ratings of the tornadoes, but I calculated the average velocity of Mr. 
Deguara towards the tornadoes was about 350 MPH or F6 range. I figured 10,000 air 
miles in 20 hours plus 700 ground miles in 10 hours. Crikey. TM