Stock photograph used as an illustration; it does not show the place, event or people in the story. Photo: Photo: Guillaume via Wikimedia Commons (CC0-1.0)
Sinking air in a high-pressure system warms as it compresses. It acts like a lid.
Skies stay clear, so the sun heats the ground.
Winds weaken, so heat does not mix away.
Nights stay warm, giving no relief.
Cities add to the heat because concrete stores warmth and releases it at night.
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