They announce the cold fog (and sometimes word of another Barry Bonds 0-for-4), usually by late afternoon.

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If the number cleared, a dispatcher called it back and asked for a code--sometimes a word (like "cartoon") or the code name of a courier.

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There is even a word for the very biggest, the megacity, sometimes defined as an urban area with a population of more than ten million.

BBC: Megacities face delicate balancing act