I've been to this site a bunch of times in the past couple of years, but figured I'd bring it up again. It has maps from a ton of past severe weather days -- he probably has a couple hundred severe weather events covered... Most have severe weather reports map, 12z and 0z upper-air and sfc data, and sometimes some soundings or other data. At any rate, it's a neat resource if you're looking for chase case ideas, or if you just want to peruse data from past events... Pattern recognition is a good forecasting tool, and this site helps. ----> http://bangladeshtornadoes.org/UScases.html and choose a year range.