helibrief_help_-_aerodrome_actual_weather_-_metar_decode.pdf
thousand one hundred metres' RVR tendency (U = increasing; D = decreasing; N = no change; not reported in UK at present) may be added after figure e.g. R27R/1100D. P1500 = more than 1500 m; M0050 = less than 50 m. Significant variations — example : R24/0950V1100, i.e. varying between two values