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FILE - Workers in hot weather work at a Radio Frequency Environment area in Riverwoods, Ill., Monday, June 17, 2024. While a heat wave brings the hottest temperatures so far this year to the Midwest and Northeast, forecasters also are discussing heat domes. What's the difference? A heat dome forms when high pressure in the upper atmosphere causes the air below it to sink, heat up and expand. (AP Photo/Nam Y. Huh, File)
FILE - Wyatt Seymore pours the last drops of liquid from a water bottle into his mouth as he takes a break from unloading a stiflingly hot trailer of fireworks outside Powder Monkey Fireworks ahead of the opening of the stand, Monday, June 17, 2024, in Weldon Spring, Mo. While a heat wave brings the hottest temperatures so far this year to the Midwest and Northeast, forecasters also are discussing heat domes. What's the difference? A heat dome forms when high pressure in the upper atmosphere causes the air below it to sink, heat up and expand. (AP Photo/Jeff Roberson, File)
A pedestrian pauses in the shade of a tree as the temperature hits 104-degrees Monday, June 17, 2024, in Phoenix. Another excessive heat warning, caused by a heat dome, is expected in the Phoenix area on Thursday and Friday. (AP Photo/Ross D. Franklin)
FILE - The unofficial temperature hits 108 degrees at dusk at Sky Harbor International Airport in Phoenix, on July 12, 2023. The U.S. last year saw the most heat waves since 1936, according to an Associated Press analysis of Centers for Disease Control and Prevention data. (AP Photo/Matt York, File)
A pedestrian crosses a street as heat waves rise from the pavement as the temperature hits 104-degrees Monday, June 17, 2024, in Phoenix. Another excessive heat warning, caused by a heat dome, is expected in the Phoenix area on Thursday and Friday. (AP Photo/Ross D. Franklin)
Hikers look for a dune to slide down at White Sands National Park, Monday, June 10, 2024, in White Sands, N.M. (AP Photo/Ross D. Franklin)
FILE - Hunter Van Dyne pauses to wipe sweat from his forehead inside a hot fireworks tent as he works to set up for the opening of Powder Monkey Fireworks, in Weldon Spring, Mo., Monday, June 17, 2024. While a heat wave brings the hottest temperatures so far this year to the Midwest and Northeast, forecasters also are discussing heat domes. What's the difference? A heat dome forms when high pressure in the upper atmosphere causes the air below it to sink, heat up and expand. (AP Photo/Jeff Roberson, File)
Smokers try and find shelter from the sun at the Collision Conference as temperatures soar in Toronto, Tuesday, June 18, 2024. (Chris Young/The Canadian Press via AP)