Reports may express wind speed in metres per second (' MPS ) or Kilometres per hour (KPH). 23018G30KT = 230 degrees true/18 kts gusting to a maximum of 30 kts. If gusts exceed the mean wind speed by 10kts or more in the 10 minutes preceding the time of the report, a letter G and 2 more figures are added to indicate the maximum wind speed e.g. 35015KT = 350 degrees true/15 kts VRB05KT = variable/0 = CALM. The mean wind direction in degrees true to the nearest 10 degrees, from which the wind is blowing and the mean wind speed in knots over the 10 minute period immediately preceding the observation e.g. The optional code word AUTO indicates that the report has been generated using data from an automated observing system. The day of the month and the time of the observation in hours and minutes UTC e.g. The ICAO indicator of the reporting station eg. Where a number of METARs are issued in the same bulletin, this, along with a date time group may be in the bulletin header. Some elements or groups may be omitted when they are not needed or do not apply: The elements of these messages are normally given in the order below. Meteorological Terminal Air Report (METAR) - literally 'Meteorological Terminal Air Report' or more straightforwardly 'Routine aerodrome meteorological report' Discussion
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