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CHICAGO —A dangerous heat wave hit much of the Midwest and South on Tuesday, with temperatures hitting triple digits in Chicago and combining with the humidity to make it feel even hotter there and in other sweltering cities.
More than 100 million people were expected to be affected by midweek, and authorities warned residents to stay hydrated, remain indoors when possible, and be aware of the health risks of high temperatures. Strong storms brought heavy rain and damaging wind to many of the affected areas on Monday, and more than 400,000 customers remained without power as of Tuesday afternoon.
Excessive heat warnings are in effect for much of Illinois and Indiana along with parts of Minnesota, Iowa, Michigan and Ohio from Tuesday through Wednesday night, according to the National Weather Service.
Heat index values - which take into account the temperature and relative humidity and indicate how hot it feels outdoors - approached and topped 105 degrees Fahrenheit (40 degrees Celsius) in some locations, including Chicago, the weather service said.
"Full sun today will make it feel even hotter," the weather service wrote. "There will not be much relief for those without air conditioning today through Wednesday night."
Much of southeastern Michigan - from just south of Flint to the state lines with Ohio and Indiana - was put under an excessive heat watch Wednesday through Thursday morning as the warm front is forecast to move east.
A heat advisory was also issued, stretching from as far north as Wisconsin down to the Florida Panhandle on the Gulf coast.
Health risks of heat
In Chicago, where a ferocious storm Monday night heralded temperatures that were expected to exceed 90 degrees on Tuesday and Wednesday, the May deaths of three women when temperatures climbed above 32 C (90 F) served as a reminder of the dangers of such heat - particularly for people who live alone or are dealing with certain health issues.
Pat Clemmons, an 81-year-old resident of the apartment complex where the women died, said everything was working well Tuesday morning as the temperatures climbed. She said that she had lived in the building for about 20 years and that she had never experienced issues before "that one horrible Saturday" in May.
"They have every kind of air conditioner, air blower, fan jets and everything else. ... I'm fine right now," Clemmons said. "The air's on. You know they're going to have everything working perfectly right now 'cause all the chaos that happened."
By mid-afternoon, the temperature at Chicago Midway National Airport reached 100 F (38 C) for the first time since July 2012, the area's weather service office reported.
Officials encouraged Chicagoans to check on their neighbors and loved ones and to quickly report any problems with cooling their homes. The city opened six large cooling centers and encouraged people to cool off in libraries, park district buildings and other public locations.
"The next two days will require that we all look out for one another and provide extra attention and resources for our vulnerable neighbors," said Alisa Rodriguez, managing deputy commissioner for Chicago's Department of Family Services and Support.
The Detroit suburb of Westland opened many of its public buildings as cooling stations Tuesday, including its city hall, fire and police stations, a library and a community center. Residents can get out of the heat, charge cellphones and get bottled water there, the city said.
South sizzles
With a noon temperature at 35 C (95 F) and the heat index pushing 43 C (110 F) on Tuesday in Birmingham, Alabama, Cindy Hanger sat outside the food truck where she works. Her face was red and her green T-shirt was soaked with sweat.
"I am worn out and I'm hot, and I'm ready to go home and have a cold drink," she said.
Hanger works outside the small rig taking and filling orders while two relatives work inside cooking. That arrangement is just fine with her on such days.
"You think it's hot out here? Imagine in there," she said.
The heat was also stressing certain power grids.
The Tennessee Valley Authority, which serves 10 million people in Tennessee and parts of six surrounding Southern states, said that on Monday, it experienced record power demand for a single day in June. It said it provided 31,311 megawatts of energy at an average temperature of 94 F (34 C) in its region, which broke the previous June high of 31,098 megawatts that was set on June 29, 2012.
The power provider said similar demand could continue through the end of the week as more hot and humid weather was expected