A National Weather Service radar image from Sunday.

A National Weather Service radar image from Sunday. Credit: National Weather Service

Thunderstorms were expected potentially to hit Long Island Sunday night before giving way to sunny skies for the start of the work week, according to the National Weather Service.

The service issued an advisory for possibly hazardous weather for Nassau and Suffolk counties, the Long Island Sound west of Port Jefferson and the South Shore bays from Jones Inlet east through Shinnecock Bay and Fire Island Inlet.

Meteorologists said they were watching storms develop in New Jersey. "They could dissipate before they reach Long Island. You might have a dry night," said weather service meteorologist Carlie Buccola. 

Some rainfall began around 5 p.m., mainly on the South Shore, meteorologists said. But the storms were moving too fast to cause any concern for flash flooding.

"They're gone already," Buccola said Sunday night of earlier storms. "They didn’t even make it across the Island."

The weather service in Upton predicted showers and thunderstorms were likely between 9 p.m. and 2 a.m., followed by a slight chance of showers. 

Some of the storms had the possibility of small hail, gusty winds, heavy rain and frequent lightning, the weather service in Upton said. 

Long Islanders will get a two-day reprieve from the rain. Monday and Tuesday will be sunny, with highs near 70.

Rain may return Wednesday and Thursday, but should be lighter than Sunday’s storms, meteorologists said. Both days will otherwise be in the mid-70s and partly sunny.

Friday is expected to be mostly sunny, with a high near 74.

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