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Long Island weather: Plenty of sun as a storm system moves on

A person crosses Great Neck Road in Copiague,

A person crosses Great Neck Road in Copiague, as rain falls across Long Island, Thursday. Credit: Newsday/Steve Pfost

After days of unsettled weather and mostly cloudy skies, Friday on Long Island is looking like the beginning of a beautiful late July, early August weekend with lots of sun and temperatures in the low 80s.

On Thursday, the National Weather Service warned of powerful thunderstorms through the night, up to a half-inch of rain and 20 mph gusts. A hazardous weather outlook remained in place through early Friday.

That system should have cleared Long Island by Friday morning, the weather service said, with sun replacing the clouds and a repeat performance on Saturday.

The high Friday should top out at 82 degrees under sunny skies with occasional clouds and a low at night of 59. Saturday looks to be a couple of degrees cooler at 79, with the temperature dropping to 64 at night, according to the weather service.

"Saturday is shaping up to be a seasonably mild and sunny day," the weather service said. "Dew points may lower into the 40s to low 50s, making it feel quite comfortable for the end of July."

The high pressure system heads out to sea on Saturday night. On Sunday, as a shortwave trough develops, a 30% chance of rain exists, mostly after 2 p.m. Otherwise, Sunday will see a mix of sun and clouds with a high near 82. The chance of rain will continue through the night until 2 a.m. Monday, the weather service said.

A shortwave trough can increase the odds of thunderstorms, the weather service said, defining these systems as disturbances in the middle or upper part of the atmosphere that cause "upward motion."

The low Sunday night will dip to 63.

Temperatures are not expected to climb above the low 80s from Monday to Wednesday, when skies should be at least partly sunny.

By comparison, July’s mean temperature is 73.9 degrees in Islip, according to weather service records that date to 1963.

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