Parts of Pennsylvania, New York, and Massachusetts, saw a foot or more of snow that fell overnight Tuesday and into Wednesday, and spread ice and dangerous conditions across Arkansas, Kansas, Kentucky, Illinois, Indiana, Iowa, Michigan, Missouri, Nebraska, Ohio, Oklahoma and Wisconsin.
The area around Philadelphia was among the hardest hit as ice downed power lines and knocked out power to more than 700,000 people, according to PECO Energy.
Several states, including New York and Kansas declared states of emergency to deal with the winter weather.
"It is going to be a frigid night for those without power," AccuWeather Meteorologist Andrew Mussoline said. "The frigid weather will help develop black ice in the Northeast so travelers will have to watch out."
And there's more pain on its way for the Northeast this weekend, with a second wave of snow coming in this weekend.