The Pennsylvania Turnpike has lifted speed restrictions for most of the system but is keeping the 45 mph limit in effect on the Northeast Extension, site of a massive pileup last week that sent 30 people to the hospital.

Officials said Tuesday that the limit would remain in effect "until the weather improves."

State transportation department also imposed but later lifted a 45 mph speed limit on some roads due to the winter storm.

The National Weather Service says the storm brought some rare "thundersnow" — heavy snow with embedded thunder — to western Pennsylvania.

Forecasters say 6.5 inches of snow has been reported in Butler County, 6 inches in Lawrence County and more than 5 inches in Somerset County, with 3 inches at Philadelphia International Airport.