People cool off at the fountain of the World War II memorial during an excessive heat wave on July 20, 2019 in Washington, DC.
Americans from Texas to Maine sweated out a steamy Saturday as a heatwave cancelled events from festivals to horse races, chased baseball fans out of their seats and pushed New York City to order steps to avoid straining the electrical system.
The National Weather Service said "a dangerous heat wave" sent temperatures into the 90s, with high humidity that made it feel considerably hotter. It was expected to stay warm at night, in the upper 70s to low 80s, with more heat on the way Sunday for the East Coast.
"It's brutal," Jeffrey Glickman said as he paused during a run in Washington.
The 37-year-old got out early to try to escape the worst of the heat but still planned to cut his route short on an already 90-degree (32-degree Celsius) morning.
"You just have to power through it the best you can," he said.
Many people in areas facing excessive heat this weekend have no air conditioning, and cities opened shelters for people to cool off. With record- or near-record-high temperatures at night when many air conditioned places are closed, the weather can become especially dangerous for people who don't get a chance to cool down, experts say.
The risks are greater for young children, the elderly and the sick.
Over three days in July 1995, more than 700 people died during a heat wave in Chicago as temperatures rose above 97 degrees (36 degrees Celsius). Many of the dead were poor, elderly and lived alone.
While the Midwest will get some relief Sunday as a cold front brings storms and lower temperatures, the East won't be so lucky until Monday, the weather service warned. The heat will be the worst from the Carolinas to Maine.
New York City authorities cancelled a Times Square commemoration of the 1969 moon landing and an outdoor festival featuring soccer star Megan Rapinoe, musician John Legend and "Daily Show" host Trevor Noah.
The city also directed owners of many office buildings to set thermostats no lower than 78 degrees (26 degrees Celsius) through Sunday to reduce strain on the electrical grid.
The measure came after a power outage related to equipment failure, not heat, caused a roughly five-hour blackout July 13 that affected a 40-block stretch of Manhattan, including Times Square and Rockefeller Center.
Storms have knocked out power to hundreds of thousands of people in parts of Michigan and Wisconsin, heightening the misery. Strong wind and rain were expected to persist Saturday night and into Sunday in the Midwest and Central Plains.
In Philadelphia, several hundred people were evacuated from a retirement community due to a partial power outage, though it wasn't immediately clear whether the problem was heat related. Residents were taken to a nearby shelter, and police said some went to a hospital for evaluation.
In New Jersey, operators of the Monmouth Park horse racing track cancelled six races and pushed back others, including the $1 million Haskell Invitational, until early evening. Maximum Security, the horse that crossed the finish line first in this year's Kentucky Derby and then was disqualified, headlines the Haskell field.
Animal rights activists protested outside the New Jersey Shore track, where temperatures hit the high 90s.
The track set up misting fans in the paddock and saddling areas for the 14-race card, shortened post parades before the race to limit track time for the horses and hosed them down after they ran.
Amid pressure over a series of horse deaths in California, several tracks cancelled their Saturday races, including Saratoga Race Course and Finger Lakes in New York and Laurel Park in Maryland.
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