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Long Island weather: Nor'easter expected to bring heavy rain, strong winds

The forecast calls for sunny skies, on Thursday,

The forecast calls for sunny skies, on Thursday, March 1, 2018, but rain develops later in the afternoon and becomes heavier as it continues overnight into Friday, forecasters said. News 12 Long Island meteorologist Rich Von Ohlen has the forecast. Credit: News 12 Long Island

A strong coastal storm will be delivering gusty winds and heavy rain for Long Island on Friday, probably leading to some power outages and areas of coastal flooding, forecasters say.

Morning commuters can expect windswept rain, heavy at times, with winds becoming increasingly gusty into the afternoon, said Jay Engle, National Weather Service meteorologist in Upton, based on the late Thursday afternoon forecast.

By late Friday afternoon and evening, some areas, apart from far eastern Suffolk, could see snow mix in, he said, with less than an inch of snow in the forecast.

As for rain, the nor’easter could bring 2 to 2.5 inches in all.

“This storm will become very powerful as it develops over the Atlantic,” with coastal flooding and strong winds its main impacts on Long Island, said Bill Korbel, News 12 Long Island meteorologist.

With its surface pressure looking to fall quickly, the storm could be deemed a bomb cyclone, an expression meteorologists use for a storm in which the air pressure decreases rapidly — by at least 24 millibars in a 24-hour period, Engle said.

Long Island was under a high wind warning, in effect from 11 a.m. Friday to 6 a.m. Saturday. Damaging winds from the north could run 25 to 40 mph, gusting up to 60 mph, the weather service said Thursday afternoon.

With such gusts, “there will no doubt be some power outages,” Korbel said, “especially closer to the storm center on the East End.”

Look for the strongest winds Friday afternoon through Friday night, capable of downing trees and power lines, and leading to limited visibility, making travel difficult, the weather service said.

And, “with a full moon on Friday, even without a storm nearby, tides would be a bit higher than normal,” Korbel said. “Add in the storm wind effects and tides will run 2 feet or a bit more above normal in some parts of the Island. “

A coastal flood warning was in effect from 6 a.m. to 11 a.m. Friday for Nassau’s bays and ocean shores, warning of moderate flooding.

Several tidal cycles could bring widespread minor to moderate coastal flooding to Long Island’s shores Friday through Saturday night, the weather service said. Areas of dune erosion and local washovers are also possible Saturday into Monday.

Rain continues into Saturday morning, with continuing gusty winds and highs in the upper 40s. Sunday was looking to be mostly sunny with a high in the low 40s, the weather service said.

The next major forecast update comes after 4 a.m. Friday.

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