happen a lot but it is dangerous. >> reporter: staying warm means piling on the layers. >> i've got this coat and then a sweater and long-sleeve shirt and thermal underwear under that. >> reporter: denver tied a chilly record at minus 15 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. these are expected early morning temperatures. minus 4 in minneapolis. minus 15 in pierre and minus 12 in denver. as this cold moves to the east, we continue to see snow, ice and rain from texas, north and east to the ohio valley and significant ice in some