PHILADELPHIA (CBS) -- The snow has been a bit delayed Saturday morning for much of the Delaware Valley, due to some very dry air that has been in place.

The air is expected to continue to saturate this morning as snow eventually overspreads the region from south to north. The bulk of the accumulation will likely occur Saturday afternoon as we get into some steadier snowfall. Otherwise, our snowfall forecast remains the same, the only adjustment is for our shore-points… some rain/sleet may mix in from time to time, bringing those totals down.

The snow will taper off from west to east Saturday night.

NEW JERSEY

A Winter Storm Warning is in effect until 1 a.m. Sunday for parts of South Jersey:

Atlantic; Camden; Cape May; Cumberland; Gloucester; Northwestern Burlington; Ocean; Salem; Southeastern Burlington.

A Winter Weather Advisory is in effect for central, northern and northwest New Jersey.

A Winter Storm Warning for snow means severe winter weather conditions are expected. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency.

Crews Gearing Up For Snowy Conditions Moving Into Area

Forecasters say 4 to 6 inches of heavy snow is possible, mainly between 6 a.m. and 6 p.m. Saturday.

PENNSYLVANIA

A Winter Weather Advisory is in effect for parts of Pennsylvania until 1 a.m. Sunday:

Delaware; Eastern Chester; Eastern Montgomery; Lower Bucks; Philadelphia; Upper Bucks; Western Chester; Western Montgomery; Lancaster; York

Forecasters say 2 to 4 inches of snow are possible, with the heaviest accumulations on Saturday.

Code Blue In Effect As First Snowfall Hits Parts Of The Region

DELAWARE:

A Winter Storm Warning is in effect for Delaware until 7 p.m. Sunday for the following counties: Inland Sussex; Kent