Predictions of heavy downpours Tuesday have forecasters warning residents of possible flash flooding across Long Island, according to the National Weather Service.

A flash flood watch is in effect through the afternoon, the Upton-based NWS said, adding that up to 2 inches of rain is likely to fall on LI as a system moves toward the region.

And it may be a quick-hitting rain storm.

Meteorologists said rainfall could occur over a short period of time at a rate of 1 to 2 inches per hour.

The storm could produce flash flooding of small streams and in urban, low-lying and poor drainage areas, the NWS said.

The system could also produce thunderstorms after 5 p.m. Tuesday, forecasters said.

The forecast for the remainder of the week calls for sunny skies through Saturday.

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