This heat will continue to build, spreading north and east throughout the early half of the week. Record-breaking heat will spread into the central Plains through the Mississippi River Valley and into the Carolinas Monday, and by Tuesday, the heat will extend from the Midwest to the Carolinas.
Several places broke daily high temperature records Saturday, including Death Valley in California, one of the hottest places on Earth. Temperatures there reached 122 华氏度, beating its previous record for June 11 set in 1921, 这是 121 度数.
别处, Roswell, 新墨西哥, 击中 111 度数, smashing its previous daily record of 106 degrees set in 2008. And Denver International Airport reached 100 度数, tying not only its daily record set in 2013, but also tying the day for earliest in a calendar year when it reached 100 度数.
多于 230 百万人 — 过度 70% of the lower 48 — will see temperatures of 90 or above over the next week.
多于 45 million of those people, 或关于 15% of the population of the lower 48, will experience triple digit temperatures through next week, mostly across the desert Southwest and the southern and central Plains.
It means at least 140 cities could set new daily high records Sunday through Wednesday: Most of the record temperatures Monday will stretch between Denver and Raleigh, 北卡罗来纳, but could spread as far north as Wisconsin and Michigan by the middle of the week. And Chicago could top out in the upper 90s Tuesday and Wednesday.
And the overnight lows, which usually allow the human body to adequately cool down, could be as unforgiving as the daytime highs.
“Your body requires cooling off at night, and actually expects it while you’re sleeping,” said Jenn Varian, meteorologist at the National Weather Service Las Vegas office.
“When we have very warm overnight temperatures, your body is simply not able to cool off properly, which in itself can cause complications, but will set you up to be less prepared for the daytime heat as well.”