A polar vortex headed for the US could bring cold winds and low temperatures this week, making January the coldest month in over a decade.
According to the National Weather Service, the arctic blast will affect a large swathe of the country, arriving in the northern Rockies and expected to have spread to the East Coast by New Year's Day.
'A significant pattern change is expected across much of the country as an Arctic Outbreak is forecast to spread form the Northern Plains to the south and east, leading to exceptionally high probabilities of below- normal temperatures expected across much of the East', the NWS said.
The plunge will bring wind chills across the Midwest with temperatures dipping below zero in at least 30 states
Poster Comment:
The Jet stream in normal times is held in place by the magnetism of the poles. But a weaker pole lets the jet stream wander about causing very cold weather in southern regions.