A massive winter storm is barreling toward the East Coast, threatening to bring the heaviest snow the Philadelphia region has seen in years.

A winter storm warning is in effect for the entire Tri-State Area, with heavy snow and dangerous cold expected late Saturday night through Monday.

"Heavy mixed precipitation possible. Total snow accumulations between 8 and 15 inches and ice accumulations up to one quarter of an inch possible in portions of central, northern, and southern Delawar...