.Intensifying storm system to bring the threat of severe weather overthe Plains on Monday followed by the Mississippi Valley on Tuesday..Well above average temperatures across the Central/Eastern U.S;Critical Risk of Fire Weather for the Central/Southern High PlainsMonday..A low pressure system responsible for producing heavy snow over themountains of California on Saturday will move into the Intermountain Westtonight and bring with it some scattered rain/snow showers. In the OhioValley/North...