Here is the video of the Grand isle waterspout!
The eyewitness video shows the biggest waterspout many Grand Isle neighbors have ever seen, which stroke off the coast of the Gulf of Mexico in Grand Isle, Louisiana, yesterday, June 19 2013. Here is the amazing video of this water twister captured by someone that lives in Grand Isle.
You can get a good idea of what is a waterspout and how they form here. For some reason these waterspouts form quite a bit in the Grand Isle/Port Fourchon area.