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How a heat dome is formed and why experts blame one for Europe’s baking temperatures

Experts say a heat dome is trapping hot air and humidity, while France has placed about half the country under red alerts.

  • On Tuesday, Meteo France placed 54 regional administrative areas under red heat alerts, describing this as an "unprecedented number," as multiple European countries issued extreme weather warnings for temperatures exceeding 40°C .
  • Meteorologists attribute the extreme conditions to an Omega block weather pattern that traps hot air over western and central Europe, creating a 'heat dome' allowing temperatures to build day after day.
  • The U.K.'s Met Office issued a rare red extreme heat warning for Wednesday and Thursday, Spain's AEMET agency reported potential highs of 44°C, and Italy's Ministry of Health declared red alerts for 15 cities rising to 16 tomorrow.
  • French Prime Minister Sebastien Lecornu reported 40 drownings since June 18, calling it a "tragic scourge of drownings" among young people, while authorities warned of severe health risks and ongoing transport disruptions.
  • Europe is warming twice as fast as the global average since the 1980s, according to the European Union's Copernicus Climate Change Service, as scientists warn human-driven global warming makes such intense heatwaves increasingly likely.
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The current heat wave has recorded large parts of Europe and led to temperature records.

·Germany
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An early heat wave hits Europe, in photos

Millions of people across Europe are sweltering under an early-season heat wave this week as temperatures climb to unusually high levels.

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Euronews broke the news in France on Tuesday, June 23, 2026.
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