From Kansas to NYC, record-breaking heat is going to bake the US into 4th of July weekend

HILL CITY, Kansas/CHICAGO/NEW YORK — Record-breaking ​temperatures spread to the eastern US from the Midwest on Wednesday, putting tens of millions of people under heat warnings expected to last into the July 4 holiday ‌weekend, when Americans will celebrate the nation’s 250th anniversary.The extreme heat was expected to push “real-feel” temperatures to 100 to 115 degrees Fahrenheit (37.8 to 46.1 degrees Celsius) across much of the region, elevating the risk of heat-related illness for vulnerable populations and threatening to overwhelm power grids already strained by rising consumption from data centers and electric vehicles.In Hill City, Kansas, a tiny high plains town 270 miles east of Denver, mail carrier Sabrina Hooper was struggling with the 100-plus-degree temperatures ​just one week after starting her job.“It’s completely debilitating,” said Hooper, 34, of the heat’s effect on her work, which entails walking up to 10 miles each day to deliver ​parcels.She said she gets some relief from lawn sprinklers: “It’s so nice.

You can take your hat off, get it wet, slap it back on ⁠your head.”Hill City was the nation’s hottest spot for five consecutive days in 2012, when another record-breaking heatwave swept the region, pushing the town’s heat index up to 108 degrees.The heat index measures ​how it feels when humidity is factored into the air temperature.Dana Robles, who lives in Brownsville, Texas, a city just off the Gulf Coast at the US-Mexico border, worried on Wednesday about the mounting costs ​of cooling her home as the heat index rose to 108 degrees.

During peak temperatures, her family’s monthly power bill can exceed $300, which is nearly one-third what they pay for rent.Robles also fears blackouts due to the overtaxed power grid.“I’m scared the electricity is going to go off all day and our food is going to get spoiled,” she said.In Chicago, high-school science teacher Michelle Klein, 57, had started...