Well, I've seen a few, but they weren't very large. The last one I saw was in 2004 near Watertown, SD; I saw the whole thing from beginning to end, but I didn't have a camera.

We were also in the middle of the massive tornado outbreak in SD in 2003 ... the one that also spawned the F4 "Manchester tornado" which produced a record pressure drop and winds up to 260 mph. That was 19 miles from my hometown.
The outbreak ran from about 3:00pm to about 10:00pm. The newsies were saying that tornadoes were dropping so fast they couldn't keep up with them. They literally said, "If you are anywhere in southeastern SD, seek shelter immediately!" With 67 confirmed tornadoes in less than 8 hours, the outbreak tied the previous record of 67 tornadoes in a 24 hour period in a single state. Considering that the previous record was in Texas (
substantially larger than southeastern SD) and during hurricane Beulah's landfall, I'd say the SD outbreak stands as record of its own. Normally I would have gone outside to try to spot tornadoes, but not that day. It was very frightening to say the least. We were glued to the TV.
http://www.crh.noaa.gov/fsd/storms/tor062403/index.phpKevin...
EDIT: Added a missing word.