The National Weather Service says the main window for showers and thunderstorms will develop from Saturday, Sept. 12, into Sunday morning, Sept. 13, as another disturbance moves into the region. Locally, heavy rainfall is possible, especially overnight.
Around New York City and nearby areas, the National Weather Service expects conditions to remain pleasant through much of Saturday before showers become increasingly likely Saturday night. Thunderstorms are possible after midnight, with locally heavy rainfall possible into Sunday morning.
The timing is similar farther south.
The National Weather Service office serving much of New Jersey and eastern Pennsylvania says another disturbance will approach Saturday into Sunday, producing a round of showers and thunderstorms.
Philadelphia could see showers developing Saturday afternoon, followed by a better chance of thunderstorms Saturday night and Sunday morning.
In Maryland and Virginia, the window for Saturday storms is strongest in the late afternoon, but storms will remain possible in the evening and overnight.
Farther north, the National Weather Service in Boston says showers and possibly a few thunderstorms could bring brief torrential rainfall late Saturday night into the first half of Sunday.
Forecasters said there is a low probability of localized flash flooding, with the greatest concern near and south of I-90. Rainfall totals will vary considerably, though a narrow band could produce substantially higher amounts where the heaviest rain repeatedly develops.
The Weather Prediction Center is also tracking excessive-rainfall potential across portions of the eastern US through the weekend, although its highest risk areas are not centered over the Northeast.
Saturday should also begin dry in many areas before clouds increase and conditions deteriorate later in the day.
The worst period for outdoor plans and travel looks to be Saturday night into Sunday morning. Downpours could briefly reduce visibility and cause water to collect in poor-drainage areas.
Conditions should gradually improve later Sunday, followed by drier, more seasonable weather for much of the Northeast on Monday, Sept. 14.
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