BOAC
If you are referring to the passage
"Given a generally smooth land surface area, when the wind
blows strong and the weather is stormy, the most powerful gusts blow in the same direction as the wind
above the boundary layer. In the northern hemisphere the wind veers clockwise about 10° to 20° with
respect to the mean wind direction
. These assumptions do not hold good in hilly terrain, thunderstorms,
thermal weather conditions, during the passage of fronts and so forth."
Yes, I've read it
And that's exactly what my question is about!
Cheers