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Re: Wind Speed For Sprayer Records

I saw that question as well and don't know the answer.  The ICAO doesn't talk to it.  The FAA says 16' stands, but doesn't say why.  Note there are two standard sizes of FAA windsocks.  Note that they stand straight out when the wind is 15 knots.  Not sure how they stand when the wind is 10 mph.

https://www.faa.gov/documentLibrary/media/advisory_circular/150-5345-27D/150_5345_27d.pdf

 

My guess is the 10m height on the anemometer is to get it out of some of the friction layer of the earth, but that is a pure guess.  Sorry I'm not of more help.

 

 

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