New York City officials have activated emergency response plans as severe heat and thunderstorms threaten multiple states across the Northeast.
NYC officials said storm chances will increase on Thursday, raising concerns for flash flooding, with the greatest risk for heavy rainfall expected Friday afternoon into the evening.
Officials urged residents, especially those living in basement apartments, to prepare for possible flooding and to exercise caution while traveling by avoiding any downed power lines or fallen trees.
"High heat and severe storms are rolling into New York City, and the best thing we can do right now is prepare and look out for one another," Mamdani said. "City government is mobilizing every resource we have—from clearing catch basins and preparing emergency crews to sending COOL vans to check on older adults. Protecting New Yorkers means showing up before the storm, not just after it."
Local leaders advised residents to take precautions against the heat by drinking plenty of water and minimizing time outdoors during peak temperatures.
Officials said hundreds of cooling centers in air-conditioned facilities would be open across NYC on Thursday and Friday, with spray showers, outdoor pools, and public beaches also available to those needing to cool off.
"The City is preparing, and we want New Yorkers to take simple steps to prepare, too," NYCEM Commissioner Christina Farrell said, asking residents to check on those who may be more vulnerable, such as older adults or people with disabilities.
Officials warned that extreme temperatures combined with high humidity may increase the risk of heat-related illness and urged anyone showing signs of heat stroke—including confusion, dizziness, breathing difficulties, rapid heart rate, nausea, or vomiting—to call 911 immediately.