The main airports are open, but some airlines have cancelled flights following days of heavy snowfall.
The airport almost ground to a halt for days in December 2010 due to heavy snowfall.
The highest recorded snowfall for Pittsburgh on this date was a half-inch in 1956.
In Pittsburgh, which was seeing its first major snowfall of the season, travelers battled the elements.
Cardiff and the south east saw the heaviest snowfall overnight with 10cm (4in) in places.
BBC: Wales snow: Hazardous road conditions as snow moves west
Denbighshire council said the south of the county had received an unprecedented amount of snowfall.
There is an emotionally satisfying explanation: maybe global warming is causing the increased snowfall.
The surface of the glacier was slick, but crusted with the residue of old snowfall.
Flintshire council said all its priority routes were treated overnight, ahead of the snowfall.
After a fruitless search of 400 homes, officers suspended their search Friday amid heavy snowfall.
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Heavy snowfall on Friday afternoon led to trains between London Kings Cross and Peterborough being delayed.
BBC: Cambridgeshire Police warn of ice patches on some roads
Early snowfall was blamed for a 19-car pileup in Cumberland, Maine, that caused minor injuries.
Ironically, an increase in snowfall could be among the most dangerous "warming" effects for this animal.
Hundreds of schools closed following the first snowfall on Friday and eight remained closed on Monday.
Others stranded after the heavy snowfall were taken in by local minister Georgina Baxendale.
Icebergs originate from ice sheets, which form on land from millions of years of snowfall.
Heavy snowfall on Friday morning caused gridlock in many areas and forced 600 schools to close.
Drivers have been warned of hazardous conditions after heavy snowfall and continuing freezing temperatures.
Drivers continue to face difficult conditions on Dorset's roads over the weekend following heavy snowfall.
Forecasters said snowfall was possible in varying amounts from the Great Lakes region through the Northeast.
Heavy snowfall has caused major disruption to motorists and public transport networks across England.
Drivers have been urged to take extra care on the roads following heavy snowfall.
Wintry weather and snowfall has caused disruption to rail and road travel in Kent and Sussex.
BBC: Kent and Sussex wintry weather causes travel disruption
According to the Isle of Man meteorological office, the island's recent snowfall was the heaviest since 1963.
Motorists and train passengers across East Yorkshire and northern Lincolnshire are being warned of further snowfall later.
The planes that took off after the snowfall ceased were too full to accommodate the grounded passengers.
Ferries have been cancelled, a crematorium closed and cars abandoned after heavy snowfall in north west Wales.
Monday's accumulation also ranked as the second highest single-day snowfall accumulation ever recorded there, the agency said.
The city picked up 7.6 inches of snow, a record daily snowfall, the National Weather Service said.
People in Staffordshire are being warned to take care on icy roads and pavements following recent snowfall.
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