I have waited to post this but now several sources, including this one, are reporting that a car filled with teenagers and video equipment was found in Tuscaloosa. The occupants died and it is believed they were storm chasing.
I have also had the video below (from YouTube) for nearly two weeks of amateurs driving into a tornado. From the audio, they seem to be chasing the storm. At the :36 mark, you can hear what sounds like an adult voice say, "let's go!" in the background as they accelerate into the storm.
The video was taken at Dunn, NC Saturday, April 16, 2011. I haven't posted it until now because I was afraid it might inadvertently encourage people to engage in this behavior. As far as I'm concerned, driving into the immediate vicinity of a tornado (whether penetrating the tornado was intentional or not) is recklessness in the extreme.
This blog, on numerous occasions, has warned of the extreme danger of storm chasing unless you are thoroughly trained and know what you are doing. If you want to see storms, sign up with one of the tour companies that will take you out safely.
Amateur storm chasing is nothing but a formula for disaster.