]> MeteorologicalAerodromeObservation Observed properties for Meteorological Aerodrome Observation Reports (METAR and SPECI) Mean runway visual range during a 10-minute period Mean value during a 10-minute period PT10M Maximum 1-minute mean RVR during a 10-minute period Maximum value during a 10-minute period PT10M Mean value during a 1-minute period PT1M Minimum 1-minute mean RVR during a 10-minute period Minimum value during a 10-minute period PT10M Mean value during a 1-minute period PT1M Extreme clockwise direction from which the wind has blown during a 10-minute period Minimum value during a 10-minute period PT10M Extreme counter-clockwise direction from which the wind has blown during a 10-minute period Minimum value during a 10-minute period PT10M Mean wind direction during a 10-minute period Mean value during a 10-minute period PT10M maximumWindGustSpeed Maximum wind speed during a 10-minute period (wind gust) Maximum value during a 10-minute period PT10M Mean wind speed during a 10-minute period Mean value during a 10-minute period PT10M Direction (from true-north) in which minimum visbility is detected Associated physical property Direction in horizontal plane (from true-north) Type of clouds (of significance to aerodrome operations) Only cumulonimbus and towering cumulus (cumulus congestus) are of significance to aerodrome operations 9 32