The National Weather Service has upgraded it freeze alerts to a "freeze warning" for all Pennsylvania counties, except Philadelphia, and a "frost advisory" for South and central Jersey.
Philly didn't quite make the warning or advisory grade because the urban heat-island effect should keep temperatures from dropping below freezing. New York City also is off the lists.
Winds are due to die down overnight, and that will allow significant radiational cooling. The warning and is in effect from 2 to 8 a.m., and the frost advisory from 4 to 8 a.m.
In the early evening, however, the breezes will be stiff from the northwest, which means that once again Roy Halladay will be getting an assist from nature -- not that he needs it.