fuagf -- we had one here maybe 15 years ago that went pretty much the same way, similar temp changes -- and they can raise temps to far higher than just around 100F ( http://en.wikipedia.org/wiki/Heat_burst )
Greensburg, KS - 5/4/07
"Eternal vigilance is the price of Liberty." from John Philpot Curran, Speech upon the Right of Election, 1790