Sub - Zero Temps In Midwest, Northeast USA.

                                                                         Picture Credit /AP

Frigid, dense air called "polar vortex" is expected to suppress temperatures in many cities in the U.S. beginning on Monday and Tuesday, with wind chill warnings stretching from Montana to Charlotte, North Carolina.

If you are planning to take a trip to any of these cities, my advise is to check the weather first to avoid long delay, and possible flight cancellations. Imagine an extreme forecast of  25 below zero in Fargo, N.D., sub zero Chicago. Wind. "It's just a dangerous cold," said National Weather Service meteorologist Butch Dye in Missouri.