INCREDIBLE video of the last F-5 tornado - May 3, 1999

**WARNING!! DO NOT TAKE COVER UNDERNEATH AN OVERPASS WHEN A TORNADO IS APPROACHING!!!*** This video defines the beginning of storm chasing for We knew very little about storm structure or forecasting back then, but we learned fast on May 3, 1999. This video is a great example of how NOT to safely storm chase. Seeking shelter under an overpass is a HUGE mistake, since the winds actually accelerate there when a tornado approaches. Check out for more insane tornado videos, our breaking news blog, and our live GPS tracker.