A deep upper low will bring windy and much colder weather across alarge portion of the western U.S. as well as heavy mountain snow throughthe next couple of days.Heavy rain and possibly severe thunderstorms over southern Texas andMid-Mississippi Valley this evening will taper off as a higher threat ofheavy rain and severe thunderstorms quickly emerges over the north-centralPlains later on Monday.Severe thunderstorms and heavy rain threats will shift east into theOhio Valley and the Great Lake...