usually thinks snow, schmo, your tune might change once you actually step outside and feel the bitter cold this storm system left behind. we're talking wind chills as low as minus 25 in places like boston and in the midwest, a frigid minus 47. it should be a lot of fun making snow angels when your eyelids are frozen shut. joining us now to talk about this dangerously cold weather is cnn chief medical correspondent, dr. sanjay gupta. good to see you. what kinds of risks do people face when the temperatures drop as low as they're getting and as low as we will see them in parts of the midwest and northeast tonight? >> well, the two big ones, as you might expect, are hypothermia and frostbite. the thing about when you talk about these conditions, they can occur at varying temperatures and different people are going to be susceptible but as a general rule of thumb, when you talk about some of the temperatures that we're talking about, negative 30 at that football game, for example, on sunday with the wind chill, in as little as 15 minutes, you can