New York City’s John F. Kennedy Airport hit 100 degrees Fahrenheit (38 Celsius) a little after noon, the first time since 2013. Then Baltimore, Philadelphia and Boston joined the 100 club. More than 150 million people woke up to heat warnings and forecasters at the National Weather Service expected dozens of places to tie or set new daily high temperature records Tuesday. The dangerous heat sent people to the hospital, delayed Amtrak trains and caused utilities to urge customers to conserve power.

“Every East Coast state today from Maine to Florida has a chance of 100 degree actual temperature,” said private meteorologist Ryan Maue, a former National Oceanic and Atmospheric Administration chief scientist. Fryeburg, Maine, also hit 100, for the first time since 2011. “Getting Maine to 100 degrees is infrequent,” Maue said.

Dozens attending outdoor high school graduation ceremonies in a northern New Jersey city on Monday were treated for heat exhaustion and related problems, including 16 taken to hospitals. The Paterson school district held ceremonies in the morning and the afternoon as temperatures soared to nearly 100 degrees. Officials halted the second ceremony about an hour after it had started due to the heat.

And in New Hampshire, two 16-year-old hikers were rescued from a mountain in Jaffrey late Monday afternoon, overcome by the heat, the New Hampshire Fish and Game Department said. They were described as being in and out of consciousness and taken to a hospital.

Utilities across the Midwest and East braced for the surge of extra demand in the heat, at times asking people to cut back on air conditioning when it felt like it was needed the most. In Memphis, Tennessee, residents were asked to turn off unnecessary lights and electronics, wait until nighttime to use dishwashers, washing machines dryers, and raise thermostats a few degrees, if health allows.

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