An Arctic air invasion is bringing freezing cold and a blast of snow to millions from Michigan to Virginia to Maine. Chicago has already been slammed with half foot of snow in the past 24 hours. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7