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Long Island weather: Rain on Friday, and it turns colder

A flash flood watch is in effect for Nassau County from Friday evening into the night.

The weather forecast for Thursday.

The weather forecast for Thursday. Photo Credit: Weather Underground

Rain, possibly heavy at times, is on tap for Friday on Long Island, most likely for the afternoon hours into early morning Saturday, forecasters say.

There’s also a shift starting during the weekend to colder temperatures — that’s highs, for the most part, in the 40s.

In the wake of Thursday’s sunny skies comes increasing clouds Friday morning, as chances for rain build in the afternoon and evening, the National Weather Service says. “Rain becomes moderate to locally heavy at times Friday night,” with gusty winds also in the picture, the weather service says.

A flash flood watch is in effect for Nassau County from Friday evening into the night.

That locally heavy rainfall could result in minor flooding of urban and poor drainage areas, with a small chance for localized flash flooding, particularly where leaves clog storm drains, the weather service said in a hazardous outlook statement.

 There’s a marginal risk for most of Long Island west of the Twin Forks to see damaging wind gusts Friday evening, according to the Storm Prediction Center. 

A gale watch will be in effect for Atlantic coastal waters from Friday afternoon through night.

And, a second coastal storm is expected to impact the area Tuesday.

Temperatures take a dip early Friday morning to the upper 30s for the day’s low, warming up to the mid-50s during the day. 

Then, with the month averaging 6.7 degrees above normal as of day end Wednesday, we're now in for some "shots of cold weather," said News 12 Long Island meteorologist Rich Hoffman, with the "coldest air of the season" hitting next week.

Saturday is partly sunny and sees a high in the mid-40s, heading down to the low 30s for early morning Sunday.

Sunday brings sunny skies and also temperatures rising to the mid-40s. The normal high for the day at Long Island MacArthur Airport in Ronkonkoma is 55, with 38 the normal low. 

Looking longer term, the outlook for next Tuesday through the weekend is for a 70-percent probability for below-normal temperatures in the Northeast, Long Island included, according to the Climate Prediction Center. There’s also a 60-percent probability for above-average precipitation.

The colder air is courtesy of a “more active northern branch of the jet stream” sending “reinforcing shots of below-normal temperatures” — that’s “air of Canadian origin,” said Jay Engle, a weather service meteorologist in Upton. .

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