degrees. at tom's urban restaurant. >> this is our walk-in cooler this is 35, 38 degrees. it's actually warmer in the freezer. >> two degrees. >> that is 17 degrees warmer than outside. >> this is where we warm up. >> reporter: and now criminals are taking advantage of the cold looking for puffers. what's a puffer? it is a car that an owner leaves running unattended so they can warm it up. police say they have had a half dozen puffer cars stolen. clayton sandell, abc news, denver. >> from the ice storm in the mid south to the brutal cold in the upper midwest the storm is dangerous. >> meteorologist jim dickey is tracking it all at accu-weather. good morning, jim. >> good morning, john and diana. once again, a brutally cold air mass has set up across the northern plains the rockies to the upper midwest.