A giant heatwave pelted the central and eastern United States on Saturday, sending residents into cooling centers and causing Washington to predict a heat index of 106 degrees F (41 degrees C) under more steamy conditions.
"It is currently quite hot from the plains states to the East Coast through the Mississippi Valley," said Alex Lamers, a weather forecaster at the National Weather Service's Weather Prediction Center.
Heat is the The deadliest of all weather phenomena and cities from Chicago to New York, according to the Weather Service, called on residents to seek refuge in cooling centers located in places ranging from libraries to shopping malls.
Tourists visit the National Monuments and Museums The Washington shopping center withstands temperatures near 37.8 ° C (1
About 250 senior citizens returned home one Saturday after leaving an age community in Philadel According to city press spokeswoman Deana Gamble, the air conditioners were disabled by a power outage and many were taken to a shelter on West Philadelphia High School forced.
The nighttime temperatures have remained so high in the mid-week heat wave that began in the Midwest. Rockford, Ill., hit its record for the first time since 1918, not falling below 27 ° C on Friday.
High temperatures combined with high humidity make it even hotter, the so-called heat index.
Cities from Chicago to New York urged residents to seek refuge in order to cool down centers.
"Heat stress usually has a cumulative effect, so if you do not recover at night, especially if you do not have air conditioning, you'll accumulate more heat stress," Lamers said.  "If it stays warm overnight, it offers a higher start for next day temperatures," he added.
Around noon on Saturday, Boston's heat index was 39 ° C and a rise to 40 ° C in the late afternoon was forecast. According to Lamers, the New York heat index was 38 ° C (100 ° F) and the expected rise was 43 ° C (110 ° F). Washington was 41 ° C (106 ° F) and the expected rise was 44 ° C (111 ° F).
Some outdoor activities, including the New York City Triathlon and a running race outside of Washington, have been canceled. Others bent their rules to keep participants cool and safe, including the Yankee Stadium, where fans could bring their own water bottles and umbrellas, and offered hydration stations at all levels of the ballpark. But relief is in sight, Lamers said.
Outdoor activities such as New York City Triathlon, a race outside of Washington, have been canceled.
"A cold front north of us will shift south and make progress toward Boston, Pittsburgh, St. Louis on Sunday night, and on Monday morning it could reach Washington, Cincinnati, with some rain and thunderstorms," he said.
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