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Long Island weather: Heavy rain, flash flood watch overnight, then cooler

Moisture associated with Tropical Storm Michael will interact with a cold front moving in, forecasters said.

A woman battles the rain as she walks

A woman battles the rain as she walks along Main Street in Sayville on Thursday. Photo Credit: James Carbone

Long Island and New York City were expected to get the brunt of heavy, sustained rain overnight from a weather meetup between a cold front and the warm, moist edges of Tropical Storm Michael, the National Weather Service said.

Almost an inch of rain is expected from midnight to morning rush hour, when the rain ends except for eastern Suffolk as Michael moves northeast, said meteorologist Tim Morrin at the service's Upton office. That's on top of the half inch to one inch of rain that soaked the Island during the daytime, he said.

"The rain starts to really get itself together tonight and overnight," Morrin said Thursday evening. "We can see rainfall rates pretty heavy, possibly even as high as an inch per hour rates coming down. It's a lot of rain in a quick hurry, so that can cause some problems with visibility and travel and ponding."

A flash flood watch for the Island was in effect until 6 a.m. Friday, with 2 to 4 inches of rain possible in some spots.

With the Island already having had an abundance of recent precipitation, “the ground is still rather moist and with up to 2 inches of rain or even a bit more possible, there will be some local flooding to contend with,” said News 12 Long Island meteorologist Bill Korbel.

The good thing is the winds are nothing compared to Michael's fury in the South. The expected gusts of up to 30 mph Thursday and Friday meant no major wind damage was expected on the Island, authorities said. 

Thursday was predicted to be the last day with highs in the mid-70s for the near future as the cold front moves in.

Finally on Friday, comes weather with the four-letter word — fall. 

"We have big changes coming our way," said News 12 Long Island meteorologist Rich Hoffman. "Go find those jackets, because you’re going to need them by the weekend."

After an unusual three months or so of high humidity and much rain, Friday will feel seasonal in terms of lower humidity, highs in the mid-60s and lows dropping all the way to the low 40s, meteorologists said.

On Saturday, the high will dip to below 64 degree normal for the date for Long Island, the service said. As of day-end Wednesday, the month so far was averaging 10.2 degrees above normal, authorities said.

With Joan Gralla

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