A major winter storm is slated to wallop a large swath of the U.S., dumping heavy snow from Kansas to Maryland and bringing some regions what could be the heaviest snowfall in more than a decade.

A winter storm watch is expected in central Illinois starting this afternoon and through to Monday, according to the National Weather Service. The Peoria area has a chance of snow on Sunday afternoon or early evening,

An updated winter storm watch was issued by the National Weather Service on Saturday at 3:40 a.m. valid for Sunday between 7 a.m. and 10 p.m. for Western Chester, Eastern Chester, Western Montgomery,

Parts of Illinois, Indiana and other Midwest states could experience the largest snowfall in more than a decade, with a major winter storm expected to deliver heavy snow, near-blizzard conditions and freezing rain.

The Lehigh Valley is now under a winter storm watch for up to 8 inches of snow Sunday, according to the National Weather Service.