I had to shoot some video for The Weather Channel this afternoon so I was not able to get out to chase the storms by Sioux Falls SD, but I was able to get to the storms by Blue Earth County, near the town of Madeila, MN.
Below are the videos from this day.
7/31/2004 Wall Cloud Video, Meso Video and Lightning Video
7/31/2004 Vivid Lightning video at dusk.