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Long Island weather: Nor'easter brings rain, winds through Saturday

Commuters dodge raindrops at the LIRR station in

Commuters dodge raindrops at the LIRR station in Mineola on Wednesday. Photo Credit: Howard Schnapp

A nor'easter will bring rain and wind through much of Saturday, and shore communities could go through rounds of minor flooding, the Islip-based National Weather Service said Wednesday.

A coastal flood advisory runs from 5 to 10 a.m. on Thursday for low-lying ocean areas, which will be followed by a coastal flood advisory that evening, the weather service said.

"Additional coastal flooding is possible during subsequent high tide cycles," it said.

East Coast nor'easters, storms that blow in from that direction, can strike at any time of year, but are most violent from September to April, the weather service says.

"Sustained northeast winds of 20 to 30 mph and wind gusts 35 to 40 mph are likely along the coast, including the NYC metro [area]," the experts said. "Across Eastern Long Island, even higher wind gusts of 45-50 mph are possible. The highest winds and strongest gusts are expected Thursday into Thursday night."

Wednesday's rain might only amount to as much as a quarter of an inch, the experts said. The nighttime low will be about 55, and rain is possible. 

Less than a foot of flooding is predicted for Wednesday evening.

Thursday's high winds, the weather service warned, "may down several tree limbs, trees and power lines, with scattered power outages and structural damage possible."

And "widespread flooding" of as much as 2 feet is expected Thursday morning, the weather service said. Still, Thursday's morning commuters might be spared: the rain mainly will arrive after 9 a.m., the NWS said, amounting to as much as half an inch. The high once again will be 59.

Rain again is likely Thursday night, when the low will be 52.

And floods could rise as high as 3 feet that evening.

On Friday, the chance of rain is 50%, the NWS said. The thermometer should rise a little further to 63, but it could be breezy. The rain might continue that night — there is a 30% chance it will, the NWS said. The low should be 54.  

Saturday's early showers — the odds are 30% before 8 a.m. — might then depart, allowing weekenders to carry out errands or outside workouts under cloudy skies. The NWS said the high should reach 64; the nighttime low is expected to be 51.

Sunday, predicted to be at least partly sunny, starts a patch of clear weather, with temperatures hovering in the mid-60s during the day, and dropping to the low 50s at night, the NWS said. 

Monday, Columbus Day, should be sunny, it said, and Tuesday mostly sunny.

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