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7h ago

Eastern US Swelters Under Heat Dome As 160 Million Face Triple-Digit Temperatures

Stagnant heat dome trapping warm air is driving extreme temperatures, triggering widespread heat advisories.

TORONTO, June 23, 2025 Children cool off in a wading pool in Toronto, Canada, June 22, 2025. Environment Canada issued a heat warning for the City of Toronto from June 22 to 24.
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A couple in sun hats and with an umbrella cross the street as an extreme heat warning is in effect in Queens, New York City, U.S., June 23, 2025. REUTERS/Kylie Cooper

Overview

  • Nearly 160 million people across 29 states in the eastern US are under extreme heat warnings and advisories as temperatures soar above 100°F and heat indices top 110°F.
  • A stagnant upper-level ridge has formed a heat dome over the region, trapping hot, humid air and producing rare overnight lows in the high 70s.
  • Officials have opened hundreds of cooling centers and urged residents, especially the elderly and outdoor workers, to stay hydrated and limit outdoor activity to prevent heat-related illnesses.
  • Electricity demand has spiked, prompting grid operators to ready power plants for peak loads, while Amtrak has reduced speeds and paused some routes to avoid heat-related rail damage.
  • The National Weather Service forecasts the heat will peak on June 24 before a cold front brings scattered showers and cooler temperatures by Thursday.