Higher pressure is usually associated with sunny weather, lower pressure with stormy weather. The temperature to which the air needs to be cooled for moisture to condense, for example, as dew.

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This view of the Cataract City comes from the top of Seneca Niagara Casino located in Niagara Falls, New York ...

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Observed at 19:00, Tuesday 15 April BBC Weather in association with MeteoGroup, external All times are Eastern Daylight Time (America/Toronto, GMT-4) unless otherwise stated.