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Old 3rd Aug 2007, 20:09
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spekesoftly
 
Join Date: Aug 2001
Location: UK
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According to UK CAA publication CAP 746 (Meteorological Observations at Aerodromes) Chapter 4 Page 3 para 3.1.9 :-

"When the wind speed is less than 1 knot, this should be reported as calm"
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