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