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Explainer-What is the 'Omega Block' causing Europe's intense heatwave?

  • The heat is being driven by an "omega block" — a stuck high‑pressure Ω pattern that locks hot, dry air in place for days to weeks and shuts off normal west‑to‑east weather flow.
  • The current Western Europe heatwave has pushed temperatures above 40°C in France and Spain and has been blamed for over 50 deaths in France; the UK is split with hot south/east and cooler north/west.
  • Scientists say climate change has raised the baseline temperature (about +1.4°C) making heatwaves hotter and this event far more likely — researchers estimate these nighttime extremes are now ~100 times more probable than two decades ago.
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