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Long Island weather: Hot, humid, with heat advisory in effect

Demi Aggelatos, 7, from Mineola keep cool in

Demi Aggelatos, 7, from Mineola keep cool in the Peconic Bay during a visit to Orient Beach State Park on Monday. Credit: Randee Daddona

It's hot out there!

The National Weather Service has issued a heat advisory for Long Island to remain in effect until 8 p.m. Tuesday.

Forecasters predict that Long Island will experience temperatures this week in the 90s, humidity above 70%, and heat index values that will make it feel hotter than 100 degrees.

The high is expected to be 91 Tuesday, before a slight chance of thunderstorms later in the day.

A heat advisory is issued when the combination of heat and humidity is expected to make it feel like it is 95-99 degrees for two or more days — or 100-104 degrees for any length of time.

Tuesday is expected to have plenty of humidity. 

Overall, expect a very hot week, with temperatures Wednesday, Thursday and Friday in the high 80s.

In addition to warnings about heat, the weather service has issued a small craft advisory for South Shore waters from Fire Island Inlet to Montauk, in effect from 8 p.m. Monday through 8 p.m. Tuesday. A small craft advisory is issued when conditions are predicted to be hazardous to smaller vessels and inexperienced mariners.

Meanwhile, the weather service is urging you venture out only if necessary — and to remain in an air-conditioned room if possible. Also, drink plenty of fluids.

Older adults, those with chronic health issues and pets all are at risk, the weather service said.

"Young children and pets should never be left unattended in vehicles under any circumstances," the heat advisory warned.

"Take extra precautions if you work or spend time outside," the advisory said, adding: "Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 911."

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