Severe weather and isolated flash flooding mostly likely over theMidwest into the Ohio Valley in early Friday with thunderstorms extendingsouthwest into Texas.Wet snow and wintry mix over the central High Plains on Saturday asheavy rain threat develops and expands over Texas.Unseasonably warm across much of the South and Southwest as cold airfrom Canada pours south into the Great Plains.A relatively progressive weather pattern is forecast to establish acrossthe nation as we head into the week...