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Map Shows 19 States Under Extreme Heat Dome Warning: 'Stay Out of the Sun'

Map Shows 19 States Under Extreme Heat Dome Warning: 'Stay Out of the Sun'

Summary

An intense heat wave is affecting 19 U.S. states, with the National Weather Service issuing Extreme Heat Warnings. The heat is driven by a "heat dome," causing dangerously high temperatures and humidity, especially in the Southwest and parts of the Midwest and South.

Key Facts

  • Extreme Heat Warnings are in effect in 19 states, including Arizona, California, Illinois, Texas, and Wisconsin.
  • Temperatures in some areas of Arizona, California, and Nevada may reach 108 to 116 degrees Fahrenheit, with Death Valley possibly hitting 120 degrees.
  • High humidity causes "feels like" temperatures between 110 and 117 degrees in parts of the South and Midwest.
  • Some northern states also face unusual heat, with Montana near 100 degrees and Minnesota and Wisconsin feeling close to 110 degrees.
  • A "heat dome" traps hot air under a high-pressure system, causing prolonged heat waves.
  • Overnight temperatures staying in the 80s and 90s provide little relief from the heat.
  • Heat warnings will last from Monday through at least Wednesday in some areas, with conditions easing later in the week for parts of the Midwest.
  • Officials advise drinking water, staying indoors in air-conditioned places, and avoiding outdoor activities during the hottest hours.
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