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CPL MET Book Question 9, Page 31

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Sasut2 created the topic: CPL MET Book Question 9, Page 31

Hi Bob and Team.

I have a quick question - I am having some difficulty understanding question 9 on page 31 which states:
"At which latitude would there be the greatest difference between the gradient wind and the actual wind at 5,000ft?", the answer being 5 degrees South.

I understand that the purpose of including the 5,000ft figure is to discount the effect of friction from finding the answer. I am confused by the following:

1) What is the meaning of "actual wind"?
In working backward from the answer I had contemplated that the meaning of actual wind could be interpreted as the wind that is the result of the pressure-gradient force where there is no effect of Coriolis. I am unsure if this is correct.

2) Assuming my thoughts in point 1 are correct, the gradient wind and actual wind at/near the equator will essentially be the same accounting for the lack of Coriolis at the equator. As such I thought that as you moved further toward a pole, the Coriolis would increase and there would be a greater difference between the wind that is the result of the gradient wind (interaction between PGF, Coriolis and centrifugal force) and the actual wind (wind due to PGF alone).

I am confused as to why 5 degrees South is the correct answer? If my rationale is correct I would have assumed that the further you move toward a pole (away from the Equator), the greater the difference. Could you please assist in clarifying?


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