There's a lot of gas around.
Via Ryan Maue at WeatherBell:
Wed morning will be coldest on avg for CONUS (11°F) but Thurs morn will beat it for area below freezing = 90% pic.twitter.com/G2BqXChtOC
— Ryan Maue (@RyanMaue) December 30, 2014
20% of CONUS now below 0°F
Nation avg of 21° coldest since mid-November. Should beat that by morning. pic.twitter.com/ECP7FRPNnH
— Ryan Maue (@RyanMaue) December 30, 2014