AMC2 MET.TR.205(e)(1) Reporting
of meteorological elements
CLOUD — AUTOMATIC OBSERVING SYSTEM
When an automatic observing system is used to report local routine report, local special report, METAR and SPECI:
(a) when the cloud type cannot be observed,
the cloud type in each cloud group should be replaced by ‘///’;
(b) when no clouds are detected, it should be
indicated by using the abbreviation ‘NCD’;
(c) when cumulonimbus clouds or towering
cumulus clouds are detected and the cloud amount and/or the height of cloud
base cannot be observed, the cloud amount and/or the height of cloud base
should be replaced by ‘///’; and
(d) when the sky is obscured and the value of
the vertical visibility cannot be determined due to a temporary failure of the
system/sensor, the vertical visibility should be replaced by ‘///’.
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