USA: more than 65 million people, before heat wave 0:42
(CNN) --
More than 65 million people in more than a dozen states are under a heat alert Thursday.
From the Ohio and Mississippi Valleys to the Southeast, temperatures will be above 32°C, with heat index levels topping 37°C.
Power outages continue for a third day in Ohio.
More than 65,000 customers remain without power in the state, where heat advisories remain in effect Thursday.
Another 137,000 customers are without power in Wisconsin and Michigan, where temperatures will also be up to 5 degrees above normal.
Heat alerts for Thursday June 16, 2022.
Starting Thursday, a downward trend in heat and humidity will begin to take shape across states in the Upper Midwest like Minnesota and the Dakotas.
The brief respite will move into the Ohio Valley, Mid-Atlantic and Northeast this weekend.
On Saturday, temperatures will be 5 to 13 degrees below normal from Columbus, Ohio, to Portland, Maine.
On Thursday, Cleveland, Ohio will hit 90°F, but come Saturday just 48 hours later, the high will drop to 70°F.
Philadelphia will see a similar 24-hour drop, going from a high of 90 degrees on Friday to a high of 75 degrees on Saturday.
While some areas will get a reprieve from the heat, the northern plains will see temperatures begin to hit record highs once again.
From Lincoln, Nebraska, to Fargo, North Dakota, temperatures will top 100 degrees later this weekend.
The heat wave that is concentrated in the Northern Plains this weekend will be between 11 and 13 ° C above normal.
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On Monday, that heat dome will move east into the Midwest and South, setting another week of records, and shortening the respite from the heat that many of these states will experience in the coming days.
We have a couple more days of dangerous heat and humidity in store before much-needed relief arrives for the weekend!
The break from the heat will be short, unfortunately, as dangerous heat looks to return early next week.
pic.twitter.com/EALRTrWRyZ
— NWS Paducah, KY (@NWSPaducah) June 15, 2022
Chicago's high temperature on Sunday is expected to be as low as 19.4C, but by Monday that high shoots up to 35C.
Raleigh, North Carolina, will experience a rollercoaster of temperatures in the coming days, going from a high of 36.6°C on Friday to a high of 28.8°C on Sunday, before reaching a predicted high of 37°C on Wednesday.
Heat is the number one cause of weather-related deaths in the United States, and providing guidance on the likelihood of heat-related illnesses, including heat cramps, exhaustion, stroke and possibly death, helps protect the public in case of extreme heat.
However, sometimes high nighttime temperatures are just as much to blame as high daytime temperatures.
"The body needs to cool down at night and actually expects it while you sleep," explains Jenn Varian, a meteorologist at the National Weather Service's Las Vegas office.
"When we have very hot night temperatures, your body just isn't able to cool down properly, which in (and) itself can cause complications, but it will also make you less prepared for daytime heat."
Temperatures must drop to at least 80°F for recovery to begin.
In fact, a person can lose up to two liters of fluid during the night through sweat if the temperature does not drop below 29.4 ° C.
Dozens of cities could break records for morning low temperatures in the next five days.
Even more records are expected in the Midwest, Southeast and Mid-Atlantic next week.
Heat wave