AMC1 MET.TR.205(d) Reporting of meteorological elements

• ED Decision 2022/004/R found in: ATM/ANS Provision of Services (2017/373) (Feb 2023)

AMC1 MET.TR.205(d) Reporting of meteorological elements ED Decision 2022/004/R PRESENT WEATHER PHENOMENA — AUTOMATIC OBSERVING SYSTEM In local routine report, local special report, METAR and SPECI reported by an automatic observing system, the following types of present weather phenomena should be reported, using their respective abbreviations and relevant criteria, as appropriate: (a)       Precipitation: (1)       drizzle (DZ); (2)       rain (RA); (3)       snow (SN); and (4)       Unidentified precipitation (UP) (b)       Obscurations (hydrometeors); (1)       Fog (FG): reported when visibility is less than 1 000 m ; (2)       Mist (BR): reported when visibility is at least 1 000 m, but not more than 5 000 m; (c)       Obscurations (lithometeors). Haze (HZ) should be used when the obscuration consists predominantly of lithometeors and the visibility is 5 000 m or less; and (d)       Temporary failure of system/sensor: the present weather should be replaced by ‘//’ when it cannot be observed due to a temporary failure of the system/sensor. AMC1 MET.TR.205(d) Reporting of meteorological elements ED Decision 2022/004/R PRESENT WEATHER PHENOMENA — AUTOMATIC OBSERVING SYSTEM In local routine report, local special report, METAR and SPECI reported by an automatic observing system, the following types of present weather phenomena should be reported, using their respective abbreviations and relevant criteria, as appropriate: (a) Precipitation: (1) drizzle (DZ); (2) rain (RA); (3) snow (SN); and (4) Unidentified precipitation (UP) (b) Obscurations (hydrometeors); (1) Fog (FG): reported when visibility is less than 1 000 m ; (2) Mist (BR): reported when visibility is at least 1 000 m, but not more than 5 000 m; (c) Obscurations (lithometeors). Haze (HZ) should be used when the obscuration consists predominantly of lithometeors and the visibility is 5 000 m or less; and (d) Temporary failure of system/sensor: the present weather should be replaced by ‘//’ when it cannot be observed due to a temporary failure of the system/sensor.