Weather at night, page 1
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reply posted on 15-4-2011 @ 11:17 PM by davespanners
If your by the sea it's to do with the jet stream.
here is a good explanation.

Basically because the land cools faster then the sea and creates a pressure difference
The rising air accumulates aloft forming an area of higher pressure. Relative to the land at the same elevation, air flows back toward land from high pressure to low pressure . Once back over land, the air cools, increases in density and then sinks causing an increase in density and high pressure . Gravity pulls the dense air offshore again completing the circulation.


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