A flood watch is in effect for northeast and southeast Suffolk from 8 p.m. Tuesday through Wednesday evening, as a slow-moving low-pressure system is expected to bring multiple rounds of heavy showers and thunderstorms, according to the National Weather Service in Upton.
Flooding caused by excessive rainfall is possible, with excessive runoff potentially leading to flooding of rivers, creeks, streams and other low-lying and flood-prone locations, the weather service said.
Forecasters said average rainfall totals of 2 to 3 inches are expected on Long Island, with localized higher amounts possible. Peak hourly rainfall rates could reach 1.5 to 2.5 inches in the heaviest showers and thunderstorms.
In its forecast discussion Tuesday afternoon, the weather service described the setup as a “highly anomalous summertime pattern,” with a slow-moving system expected to linger near the region through Thursday. The heaviest showers and thunderstorms are expected to move in from the west in bands later Tuesday and pivot east overnight as the surface low settles, forecasters said.
The National Weather Service urged residents to monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
The local forecast calls for showers and thunderstorms Tuesday night, with a 90% chance of precipitation and 1 to 2 inches of additional rainfall possible. Showers and thunderstorms are expected to continue Wednesday, also with a 90% chance of precipitation and another 1 to 2 inches of rainfall possible.
For flood safety information, visit weather.gov/safety/flood.
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