The threat of a dangerous layer of ice has increased from the massive winter storm expected to slam New Jersey this weekend, burying most of the state under 12 to 18 inches of snow.

The Delaware Valley is bracing for a what AccuWeathear called the defining storm of the winter this weekend, which will drop several inches of snow on the greater Philadelphia region.

Forecasters believe at this time that the storm will deliver warning-level snowfall across much of the New York City area.