National Weather Service United States Department of Commerce

Sub-zero temperatures persist through Tuesday morning, along with wind chills of -30 to -40 °F. Wind chills will be most dangerous between 8pm & 9am, when frostbite can occur on exposed skin within minutes
Wind chills as low as 30 to 40 degrees below zero are expected this morning and again tonight into Tuesday morning.
The worst of the arctic air will be over us for about the next 24 hours, with temperatures returning back closer to normal on Wednesday. We may see some lights snow Tuesday night into Thursday, but it will only be a dusting.
If someone might have frostbite or hypothermia, seek medical attention immediately!