PHILADELPHIA — Winter is set to arrive in Pennsylvania before Halloween.

The National Weather Service has issued a winter storm watch for tonight as a storm system is expected to bring sometimes heavy snow to central and northeastern Pennsylvania.

Between six and 10 inches of snow could fall in higher elevations, including the Laurel Highlands and the Pocono Mountains. Philadelphia and Pittsburgh may get a coating.

Forecasters warn that the heavy, early snow could bring down tree limbs that are still covered in leaves.

Snow is expected to begin falling late tonight in Western Pennsylvania and move out of eastern Pennsylvania by Saturday night.