An active weather pattern for much of the Plains into the Mid to UpperMississippi Valley regions......Thunderstorms to bring heavy rains, localized flash flooding and severeweather to portions of the Plains......An elevated to critical fire weather threat across the Southern HighPlains.....Cooler than average temperatures expected from the Rockies to the Westcoast and from the Mid-Atlantic to the Northeast, while much above averagetemperatures spread from the Southern Plains to the Great Lake...