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Long Island weather: Flood advisory for central Suffolk canceled

The weather forecast for Friday, July 27, 2017.

The weather forecast for Friday, July 27, 2017. Credit: Weather Underground

The final weekend in July is forecast to bring some rain Saturday that’s expected to clear out for a sunny Sunday, forecasters say.

On Friday afternoon a flood advisory was issued, and since canceled, for central Suffolk County, the National Weather Service said.

That’s where radar had indicated heavy rain that could cause flooding of roadways, underpasses and other drainage and low-lying areas.

Friday’s spate of heavy rain formed due to instability and the development of sea breezes, said John Murray, weather service meteorologist in Upton. It’s not related to the system that’s expected to move into the area later Friday night, he said.

The track of that out-of-season nor’easter still appears to be far enough to the south that Long Island will be escaping the heaviest rainfall — at least for now, said Adrienne Leptich, a weather service meteorologist based in Upton.

That’s as, after Friday’s partly sunny skies and highs in the lower 80s, chances for rain pick up at around 8 to 9 p.m. Friday, with rain more likely by midnight.

Friday brings the “chance of a shower late afternoon into this evening,” said Rich Hoffman, News 12 Long Island meteorologist. Then for Saturday, “expect showers in the morning,” with a chance for moderate to heavy rain.

However, “don’t cancel afternoon plans yet,” he said, as there could be some “late day clearing.”

Rainfall amounts are forecast to be from half an inch to an inch, but Leptich said that a northerly shift in the system’s track could mean higher amounts.

Some strong winds will be in the picture Saturday, she said — 20 to 25 mph from the northeast, gusting to 35 mph.

Chances for rain decrease during the day Saturday to about 50 percent, and down to 20 percent by evening.

That’s followed by “plenty of sun” on Sunday, with highs in the mid-70s.

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