Violent thunderstorms will wreak havoc Saturday from Louisiana, Mississippi andAlabama northward to the Ohio River. In this general area, numerous tornadoesare expected, and a few could be exceptionally powerful with the chance forserious damage to some communities.DO NOT TAKE THIS SITUATION LIGHTLY! IT IS THE MOST VOLATILE WE HAVE SEEN SO FARTHIS SEASON!While the South and Midwest are being hammered by severe thunderstormsSaturday, the weather out West will turn delightful. The cold flow that existedin California, Nevada and Arizona during the past couple of days will becompletely gone, and temperatures will make a remarkable recovery. Forinstance, the high deserts of Southern California and western Arizona canexpect low to middle 90s Sunday afternoon. Thursday in Phoenix, the high was67, so it's going to be quite a change.

Story by AccuWeather.com Senior Meteorologist John Kocet.