A weather whiplash is predicted to hit people in the Rockies and Plains this week, as conditions go from balmy to blizzard overnight. The high is predicted to be around 80 degrees in Denver and other cities Tuesday — but within 24 hours, blizzard conditions are forecast, the National Weather Service says. "Warm today. Snow tomorrow," says the NWS office in Denver and Boulder, Colo., predicting temperatures that could hit record highs Tuesday — followed by rain turning to snow, in a blast of cold air that will ride winds of 40-60 mph on Wednesday. For many central U.S. residents,...