My runs in the (very) wet weather during the 2008 SCCA ProSolo Finale in Topeka KS. ProSolo is sort of a combo between drag racing (start at a tree, etc) and autocross. During each round of class competition, you take four runs (2 on the left course, 2 on the right course) in a back-to-back-to-back-to-back format pretty quickly. These are my Friday afternoon runs.
The weather on this day was VERY bad, the site received approx 3" of rain on that day!! Launching a car in the rain was interesting to say the least, not to mention trying to find the traction "edge" in conditions where the edge wasn't nearly as far out as it normally is!