ERIE, Pa. (AP) — As snow continues to pile up in Erie, Pennsylvania, which already has nearly 63 inches on the ground, forecasters warn of frigid, sub-zero arctic air and dangerously cold wind chills in much of the U.S.

A storm in Erie brought 34 inches of snow on Christmas Day, an all-time daily snowfall record, and another 24.5 inches by Tuesday night. The city issued a snow emergency, citing “dangerous and impassable” roads and asked residents to stay off the streets. State police and the state Department of Transportation are urging people to avoid travel, citing poor visibility and deteriorating conditions.