From NBC News:
Frigid temperatures generated by what one meteorologist labeled a “polar vortex” took hold across a wide swath of the Midwest and Northeast on Saturday, as the regions dug out from a deadly snow storm and braced for another blast of dangerous winter weather.
The frigid air is coming from the North Pole and — due to a jet stream — will be intense and mobile, Ryan Maue, a meteorologist for Weather Bell, told the Associated Press. Forecasters said record lows could be eclipsed.
“All the ingredients are there for a near-record or historic cold outbreak,” Maue said “If you’re under 40, you’ve not seen this stuff before.”
In other news, global warming has been cancelled due to record cold temperatures, record snowfalls, record ice in summertime Antarctica, etc.