Randy - a heavy rain often oxygenates the upper part of the water column.
What better opportunity to toss a topwater bait or two?

One of the best days I ever had was during a rain no short of a monsoon. The
bass were tearing up Super Flukes all day in that rain. The rain and the
fishing lasted two days straight. I probably caught almost 100 fish those two
days. The only problem was all of them were short of the 15" mark. Most were
14 1/2 - 14 3/4...just my darn luck!

Brad Coovert
2003 Angler of the Year, Greenfield Bassmasters
http://www.greenfieldbassmasters.com