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× Welcome to the CPL Meteorology question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.

Changes in wind direction over land and sea

  • Posts: 29
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Raji created the topic: Changes in wind direction over land and sea

Hi Bob/Stuart,

My understanding (as per BT textbook) was that friction over land is more and the surface wind speed drops by two-thirds over land and veers by 30 degrees.
However, in a Bureau of Meteorology online course it was said that wind speed over sea drops by two-thirds. Could you please let me know which one is correct.
Attached is a picture of both.

Cheers,
Raji
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  • Posts: 1902
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bobtait replied the topic: Changes in wind direction over land and sea

Hello Raji
I think you will find that the Bureau of Met book says that the wind speed over the sea is reduced TO two thirds of the gradient wind. In my book I said it is reduced BY one third. Both are saying the same thing.

Bob
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