A mild but widespread winter storm is developing over the Northeast and the upper Ohio River Valley, the second in less than a week for the regions.

The National Weather Service has issued a winter weather advisory for South Jersey through 7 p.m., with a mix of snow and rain expected between 1 and 2 inches in some parts of the region.

Forecasters expect the heaviest snowfall of 4 to 8 inches in southern New England, including Boston and Providence, R.I. The snow is expected to start falling there Saturday afternoon.

Drivers are being warned to be cautious. Officials lowered the speed limit to 45 mph on much of the Pennsylvania Turnpike.

The earlier storm dumped more than a foot of snow in some places has been blamed for at least 16 deaths. The National Weather Service says it spawned more than a dozen tornadoes in Alabama.