January 8, 2015 5:25 am NBC10 First Alert Weather: Dangerous Cold The coldest air of the season has windchill figures falling below zero. US & World Videos 2:05 Wednesday's Child: Gianna 10:45 ‘Giant Heart' procedure: The Lineup 0:16 Philadelphia police department combines 2 police districts. This is why 0:36 Franklin Institute's Giant Heart to close for months. Here's what will come next 0:16 Philly's Rocky statue getting a spring cleaning