It says dangerous levels of heat and humidity are on tap for Sunday. The advisory is in effect from noon to 8 p.m.
An excessive heat warning is issued when the combination of heat and humidity is expected to make it feel like it's 105 degrees or greater.
The advisory covers the city's five boroughs, Long Island, Rockland and Westchester counties and parts of New Jersey.
Slight relief is expected for Monday with temperatures in the high 80s. There's a chance of showers and thunderstorms in the evening.
People are advised to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
New York City will have cooling centers open throughout the weekend.
The cooling centers are air conditioned places, such as Department for the Aging (DFTA) senior centers, libraries, and community centers, that are open to the public during heat emergencies.
To find the cooling center closest to you, call 311 (TTY: 212-504-4115) or visit OEM's Cooling Center Locator at http://www.nyc.gov/oem.
OEM urges New Yorkers to take precautions to prevent serious illness that can result from the heat, especially among vulnerable individuals such as seniors and those with chronic health problems.
New Yorkers who are vulnerable should use air conditioning to stay cool, go to a place that has air conditioning if it is not available at home, drink water at regular intervals, and limit strenuous activity, especially during the hottest parts of the day.
New Yorkers are urged to check in on vulnerable friends, family members and neighbors to help them stay cool.
Heat illness is serious. Prolonged exposure to the heat can be harmful and potentially fatal.
The added stress caused by heat can also aggravate heart or lung disease even without symptoms of heat illness. The risk for getting sick during a heat wave is increased for people who:
? Do not have or do not use air conditioning
? Are age 65 or older
? Have chronic medical or mental health conditions
? Take certain medications, which can disrupt the regulation of body temperature
? Are confined to their beds, have trouble with being mobile, or are unable to leave their homes
? Are overweight
? Consume alcohol or illegal drugs
For more information on coping with heat, see the Ready New York: Beat the Heat guide at http://www.nyc.gov/oem
Jersey City has opened two community centers and two senior centers as cooling centers: the Mary McLeod Bethune Community Center, 140 Martin Luther King Drive, the Pershing Field Community Center, Pershing Field Complex, the Joseph Connors Senior Center, 28 Paterson St. off of Central Avenue and the Maureen Collier Community Center, 335 Bergen Avenue between Ege and Virginia Aves. All are open 10 a.m. to 8 p.m. Sunday.