When there is no wind, for example, heat builds up in a city, creating a low-pressure system that pulls air into the city.
CNN: In-Depth Specials - City Limits
The past two years it got stuck on top of southern England - and that locked a low-pressure system in place which in turn brought misery and rain.
BBC: Met Office cools summer forecast
Miles below, another low-pressure system is brewing.
CNN: The snows of Erukenya
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