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Heat Dome Traps 100 Million Across 18 States Under Extreme Heat

High humidity with warm nights offers minimal relief during widespread National Weather Service heat alerts.

Farmer Bruce Wessling checks a corn field near Grand Junction, Iowa, in July 2018. In Iowa, corn pumps out "a staggering 49 to 56 billion gallons of water into the atmosphere each day" throughout the state, the National Weather Service said.
Beachgoers enjoy sunbathing during during an intense heat wave in Miami Beach on July 16, 2023.
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Overview

  • More than 100 million Americans in 18 states are under NWS extreme heat warnings, watches and advisories as a stagnant high-pressure dome drives daytime temperatures into the triple digits
  • Chicago faces an Extreme Heat Watch from Wednesday through Thursday with heat index values forecast between 105°F and 115°F and overnight lows near 90°F
  • Houston is poised for its first 99°F to 100°F reading this season, with daily highs of 97°F to 99°F and heat indices reaching up to 114°F
  • North Texas residents can expect upper-90s heat to climb to 101°F by Thursday, with minimal nighttime cooling in the mid-70s
  • A surge of Gulf moisture late in the week may bring storms and lower temperatures, and officials are urging hydration, air-conditioned refuge and regular checks on vulnerable neighbors