AMC1 MET.TR.200(a)(12) Meteorological reports and other information
SUPPLEMENTARY INFORMATION —
SEMI-AUTOMATIC OBSERVING SYSTEM
(a) In local routine report, local
special report, METAR and SPECI, when reported by a
semi-automatic observing system, the following recent weather phenomena should
be reported, up to a maximum of three groups, in the supplementary
information:
(1) freezing precipitation;
(2) moderate or heavy precipitation, including
showers thereof;
(3) blowing snow;
(4) dust storm, sandstorm;
(5) thunderstorm;
(6) funnel cloud, tornado or water spout; and
(7) volcanic ash.
(b) In local routine report and local special
report when reported by a semi-automatic observing system, the following
significant meteorological conditions, or combinations thereof, should be
reported in the supplementary information:
(1) cumulonimbus clouds (CB);
(2) thunderstorm (TS);
(3) moderate or severe turbulence (MOD TURB,
SEV TURB);
(4) wind shear (WS);
(5) hail (GR);
(6) severe squall line (SEV SQL);
(7) moderate or severe icing (MOD ICE, SEV
ICE);
(8) freezing precipitation (FZDZ, FZRA);
(9) severe mountain waves (SEV MTW);
(10) dust storm, sandstorm (DS, SS);
(11) blowing snow (BLSN); and
(12) funnel cloud (tornado or water spout) (FC).
The location of the condition should be indicated. Where necessary, additional information should be included using abbreviated plain language.
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