With wind chill temperatures forecast for 30 degrees below zero and lower for Wednesday night into Thursday, New Hampshire emergency management authorities are urging people to stay indoors as much as possible and dress in layers when they go outside.
Homeland Security Directory Perry Plumber encourages people to have emergency supplies in their car in case they get stuck.
People also should watch for signs of frostbite, such as the loss of feeling or white or pale appearance in fingers, ear lobes and the tip of the nose.
Use alternate heating sources properly, such as a fireplace, wood stove or space heater. If power is lost, close off unneeded rooms, stuff towels or rags in the cracks under doors and cover windows at night.
Pipes should be wrapped in insulation.