Geography
Why Urban Heat Islands Intensify Under Anticyclonic Conditions
Quick fact
During anticyclonic conditions, the urban heat island can be 2–3 times stronger than on an average day, sometimes pushing nighttime temperatures in cities several degrees above those in surrounding rural areas.
Why this is interesting
Have you ever noticed how the hottest days in a city often come when the sky is perfectly clear and the air is still? That's not a coincidence—it's the fingerprint of a high-pressure system making urban heat islands stronger.