First batch mostly missed everyone north of 78 (except N of 78 and east of about the Parkway through NYC, which did get hit with some rain), which is a surprise, but that's not very unusual with mesoscale convective events like this. They hammered points from 276/195 and south of there where flash flood warnings are now up, as 1-2" were common and 3-4" came down in spots. One more round to come with the front late this morning through early/mid afternoon, but probably <1/2" for most with this batch, although some areas could, again, get an inch or more. Will start improving by 2-3 pm for most.
National Weather Service Mount Holly NJ
1038 AM EDT Fri Jul 6 2018
NEAR TERM /UNTIL 6 PM THIS EVENING/...
An initial batch of showers and thunderstorms with heavy rain
moved across southeastern Pennsylvania and central and southern
New Jersey early this morning.
Rainfall totals of 1 to 2 inches
were common in that area with some spots receiving 3 to 4
inches. That area of showers and thunderstorms had moved off the
coast by 10:30 AM. Meanwhile, showers and thunderstorms
lingered in southern Delaware.
Additional showers and
scattered thunderstorms associated with
a pre-frontal
trough extending from western New England to
central Pennsylvania will continue to strengthen as they move
eastward.
The pre-frontal showers and thunderstorms are forecast to
progress through eastern Pennsylvania and northern New Jersey by
early afternoon. The back edge of the precipitation is
anticipated to reach southern Delaware and far southern New
Jersey before 6:00 PM.
The potential for locally heavy
rainfall persists. As a result,
the
Flash Flood Watch remains in effect until 2:00 PM.