AMC1 MET.TR.205(b)(1) Reporting of meteorological elements
VISIBILITY
In METAR and SPECI, visibility should be reported as prevailing visibility. When the visibility is not the same in different directions and:
(a) when the lowest visibility is different
from the prevailing visibility, and (1) less than 1 500 m or (2) less
than 50 % of the prevailing visibility, and less than 5 000 m,
the lowest visibility observed should also be reported and, when possible, its
general direction in relation to the aerodrome reference point indicated by
reference to one of the eight points of the compass;
(b) if the lowest visibility is observed in
more than one direction, then the most operationally significant direction
should be reported; and
(c) when the visibility is fluctuating
rapidly, and the prevailing visibility cannot be determined, only the lowest
visibility should be reported, with no indication of direction.
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