Define ‘wind’ and ‘surface wind’ (050.02.01.01.01).
State the units of wind directions (degrees true in reports; degrees magnetic from tower) and speed (kt, m/s) (050.02.01.01.02).
Describe that the reported wind is an average wind derived from measurements with an anemometer at a height of 10 m over 2 min for local routine and special reports and ATS units, and over 10 min for aerodrome routine meteorological reports (METARs) and aerodrome special meteorological reports (SPECIs) (050.02.01.01.03).