Repeating downpours will raise the risk of flash and urban flooding around New York City and in parts of New Jersey, New York state, Connecticut and Pennsylvania Wednesday.
Bands of heavy rain and thunderstorms will spiral around a slow-moving, land-based storm over the mid-Atlantic.
It is the same storm which brought record May snowfall to parts of the Plains last week and flooding over the past weekend to portions of the Midwest and South.
The rain bands will shift around with time and breaks of sunshine are possible in between. New bands will form and could drench areas for a second or third time into Thursday.
The storm can produce a couple of inches of rain locally over a several-hour period, which is more than enough to cause flooding problems and travel delays.
Motorists are reminded not to drive through flooded roadways.
It is possible that a few of the thunderstorms might cause lightning strikes to cluster in a small area. The storms also bring the risk of highly localized gusty winds and small hail.
Additional downpours can occur over the region Wednesday night and Thursday.