A detailed analysis (courtesy of the Met Office) of the wind flow over the southern half of the British Isles and NW France on a very hot day in 2003. The information is a combination of actual reports (which can be seen) in white symbols), numerical analysis and some human input. It very clearly shows how the warming of the land causes sea breeze effects on a very large scale when the ground gets very hot.
The sea breeze is associated with rising air over land. The areas where the flow is separating over the sea are compensating areas of descending air. Alan watts has called this Channel Separation.
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