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26/10/2018 1:26 pm
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
28/10/2018 3:32 pm
Hello Raji
I think you will find that the Bureau of Met book says that the wind speed over the sea is reduced [i][b]TO[/b][/i] two thirds of the gradient wind. In my book I said it is reduced [i][b]BY[/b][/i] one third. Both are saying the same thing.
Bob
