during the day. nighttime, slow radiation, it's a cooling process that allows significant cooling to take place. so temperatures continue to drop in some of these areas down to 8 degrees this morning fahrenheit. you'll notice it takes about three days of temperatures above 50 fahrenheit or 10 celsius for 2 to 4 inches of snow to melt. with 14 inches on the ground, it will take weekes for all of the snow to be entirely out of the way unless it's properly removed, of course. then you take a look. this area has gone on a temperature roller coaster. charlottesville, virginia, was 70 degrees on new year's day. temperatures this morning dropping off down into the lower and middle single digits, around 8 degrees. remarkable turn of events in a matter of a couple days, essentially setting the stage for the snow to stick around and make it that much more disruptive. but matt pattern is going to ge colder for some of these areas as we get another surge of arctic air. that spills across areas of the northeast. notice the temperatures in chicago.