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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Meteorology > In an idealised Northern Hemisphere case, assume the wind at 3,000 ft is above the surface friction layer and approximately geostrophic. How does it compare with the surface wind?

252 - ATPL Question Bank in English - In an idealised Northern Hemisphere case, assume the wind at 3,000 ft is above the surface friction layer and approximately geostrophic. How does it compare with the surface wind?

Question 252 - Meteorology - ATPL - Airline Transport Pilot Licence

They are practically the same, except when eddies exist, caused by obstacles

They have the same direction, but the surface wind is weaker, caused by friction

The surface wind is veered compared to the wind at 3000 feet and is usually weaker.

The wind aloft is approximately parallel to the height contours; the surface wind is usually weaker and crosses the isobars toward lower pressure.

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