ERIE, Pa. (AP) — Bitter cold weather has taken hold of much of the northern United States and is expected to stay put for days to come as two Minnesota cities already have set record low temperatures and a city in Pennsylvania continues to dig out from a record snowfall.

Forecasters warned of hypothermia and frostbite from arctic air settling in over the central U.S. and spreading east.

The National Weather Service reported International Falls, Minnesota plunged to 37 degrees below zero, breaking the old record of 32 below set in 1924. Hibbing, Minnesota, bottomed out at 28 below, breaking the old record of 27 below set in 1964.

Wind chill advisories or warnings were in effect for much of New England, northern Pennsylvania and New York. Those places and states in the northern Plains and Great Lakes were projected to see highs in the teens or single digits and lows below zero for the rest of the week and into the new year.

The National Weather Service said wind chills in many areas Thursday could make temperatures feel below zero.

People in Erie, Pennsylvania, continued to dig out from a storm that brought 34 inches of snow on Christmas Day, smashing the daily snowfall record for the Great Lakes city of 8 inches, and 26.5 more inches on Tuesday. More than 65 inches total fell on the city in just a few days.