From the National Weather Service:
The Arctic air mass will remain in place for one more day, with dangerously cold temperatures tonight and Sunday. These cold temperatures will be a threat to people, pets and property.
Additionally, there is a winter storm that will impact the region Monday into Tuesday.
The best chances for wintry weather, in the form of snow and ice are north and west of the Interstate 95 corridor, with the highest accumulations in the Poconos, Lehigh Valley and Northwest New Jersey.
Heavy rain is also a threat, especially further south and east.