in chicago, a main international hub for american and united airlines, they are expecting up to 18 inches of snow. even the president is worried. please, take this storm extremely seriously. i don t know if your bosses will let you but if y all have travel plans, leave now. that s not a joke, i m sending my staff, if they have plans to leave tomorrow, late tonight, i m telling them to leave it now. they can talk to me on the phone, it s not life or death. it will be if they don t get out, they may not get out. joining us isjonathan porter, chief meteorologist at accu weather s global weather station in philadelphia. thank station in philadelphia. you for being with us. thes are thank you for being with us. these are really low temperatures. have you seen anything like this before? we have certainly seen some cold outbreaks across north america before, but, christian, the thing thatis before, but, christian, the thing that is unique about this is just how far that cold air is surging in