]> Observed properties for METAR and SPECI (Meteorological Aerodrome Reports) 27 Mean runway visual range during a 10-minute period 10 Mean value during a 10-minute period Maximum 1-minute mean RVR during a 10-minute period 10 Maximum value during a 10-minute period 1 Mean value during a 1-minute period Minimum 1-minute mean RVR during a 10-minute period 10 Minimum value during a 10-minute period 1 Mean value during a 1-minute period Extreme clockwise direction from which the wind has blown during a 10-minute period 10 Minimum value during a 10-minute period Extreme counter-clockwise direction from which the wind has blown during a 10-minute period 10 Minimum value during a 10-minute period Mean wind direction during a 10-minute period 10 Mean value during a 10-minute period Maximum wind speed during a 10-minute period (wind gust) 10 Maximum value during a 10-minute period Mean wind speed during a 10-minute period 10 Mean value during a 10-minute period Direction (from true-north) in which minimum visbility is detected Direction in horizontal plane Associated physical property Type of clouds (of significance to aerodrome operations) Only cumulonimbus and towering cumulus (cumulus congestus) are of significance to aerodrome operations 9 32