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Extreme Heat Is About to Return — Here’s Where It Will Be the Worst

ILLINOIS, JUL 21 – Heat index values may reach up to 115 degrees Fahrenheit in Illinois, increasing risks of heat-related illnesses as the heat dome traps hot, humid air over the region.

  • The National Weather Service issued an Extreme Heat Watch for northern, central and southern Illinois, in effect from Tuesday morning through Thursday evening.
  • This pattern stems from a heat dome trapping humidity and rising temperatures, a trend growing more severe due to fossil fuel-driven climate change, increasing heat wave frequency and intensity.
  • A peak heat index of 115°F is expected on Wednesday and Thursday, the National Weather Service said, followed by 'corn sweat' increasing rural humidity and `It's definitely a thing` quote.
  • The Champaign-Urbana Public Health District urged residents to take precautions, warning extreme heat poses serious health risks, and a 24-hour shelter was opened from Sunday, July 20 to Saturday, July 26.
  • A cold front on Friday may ease heat conditions, but it's still uncertain when the heat wave will fully end, the National Weather Service said.
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Jacksonville Journal-Courier broke the news in on Monday, July 21, 2025.
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