Nightly news begins now. From nbc news World Headquarters in new york, this is nbc nightly news. Reporting tonight, lester holt. Good evening. Tonight the coldest weather of the season is settling in across much of the countrys eastern half. This winter of extremes has already exacted a heavy toll. Dozens of weatherrelated deaths from ohio to tennessee where this week at least 15 people have died, a third from hypothermia. Right now the siberian express is spreading across the east bringing singledigit and belowzero temperatures from the great lakes to the northeast. And even record lows in florida. Lets start in nashville with nbcs gabe gutierrez. Reporter relentless, snow, ice and now subzero temperatures some 40 degrees below average have much of the country frozen over. In michigan new video of an officer somehow surviving this crash over the weekend. In tennessee, a dash cam captured another close call. A worker clearing a crash scene barely managed to jump out of the way of a pic