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reports:
a) the averaging period for mean surface wind direction
and speed shall be 2 minutes;
b) speed variations shall be expressed as the maximum
and minimum values attained;
c) light and variable surface winds of 6 km/h (3 kt) or
less shall include a range of wind directions, whenever
possible.
11.4.3.2.3.1.3 In meteorological reports disseminated
beyond the aerodrome:
a) the averaging period for mean surface wind direction
and speed shall be 10 minutes;
b) speed variations shall be expressed as the maximum
value attained. Minimum wind speed shall not be
included.
11.4.3.2.3.2 Visibility, including significant
11.4.3.2.3.2 directional variations
11.4.3.2.3.2.1 When the visibility is less than 500 m, it
shall be expressed in steps of 50 m; when it is 500 m or
more but less than 5 000 m, in steps of 100 m; 5 000 m or
more but less than 10 km, in kilometre steps; and when it is
10 km or more, only 10 km shall be given, except when the
conditions for the use of CAVOK apply.
11.4.3.2.3.2.2 In local meteorological routine and special
reports, the visibility shall be representative of:
a) the take-off/climb-out area for departing aircraft;
b) the approach and landing area for arriving aircraft.
11.4.3.2.3.2.3 In meteorological reports disseminated
beyond the aerodrome, the visibility shall be representative of
the aerodrome and its immediate vicinity. In case of significant
directional variations in visibility:
Chapter 11. Air Traffic Services Messages 11-13
1/11/01
a) the lowest visibility shall be reported;
b) additional values shall be given with indications of the
direction of observation.
11.4.3.2.3.3 Runway visual range (RVR)
11.4.3.2.3.3.1 Runway visual range values up to 400 m
shall be given in increments of 25 m, values between 400 and
800 m in increments of 50 m, and values above 800 m shall be
given in increments of 100 m. Runway visual range values
which do not fit the reporting scale shall be rounded down to
the nearest lower step in the reporting scale.
11.4.3.2.3.3.2 In local meteorological routine and special
reports, the averaging period for RVR shall be 1 minute and:
a) when the runway visual range is above the maximum
value which can be determined by the system in use,
it shall be reported as more than the specified distance,
e.g. RVR RWY 14 ABV 1 200M where the figure
1 200 is the maximum value that can be determined by
the system;
or
when the runway visual range is below the minimum
value which can be measured with the system in use,
it shall be reported as less than the specified distance,
e.g. RVR RWY 10 BLW 150M.
b) when the runway visual range is observed from one
location along the runway about 300 m from the
threshold, it shall be included without any indication
of location, e.g. RVR RWY 20 600M;
or
when the runway visual range is observed from more
than one location along the runway, the value for the
touchdown zone shall be given first and shall be
followed by the values representative of the mid-point
and stop-end. The locations for which these values are
representative shall be given in meteorological reports
as TDZ, MID and END, e.g. RVR RWY 16 TDZ
600M MID 400M END 400M;
Note.— Where reports for three locations are
given, the indication of these locations may be omitted,
provided that the reports are passed in the order
specified above, e.g. RVR RWY 16 600M 400M 400M.
c) when there is more than one runway in use, the
available runway visual range values for each runway
shall be given and the runways to which the values
refer shall be indicated, e.g. RVR RWY 26 800M
RVR RWY 20 700M; if the runway visual range is
available only for one runway, that runway shall be
indicated, e.g. RVR RWY 20 600M.
11.4.3.2.3.3.3 In meteorological reports disseminated
beyond the aerodrome, the averaging period for RVR shall be
10 minutes and:
a) only the value representative of the touchdown zone
shall be given, and no indication of location on the
runway shall be included;
b) when there is more than one runway available for
landing, touchdown zone runway visual range values
shall be included for all such runways, up to a
maximum of four, and the runways to which the
values refer shall be indicated, e.g. RVR RWY 26
500M RVR RWY 20 800M;
c) when the runway visual range values during the 10-
minute period immediately preceding the observation
have shown a distinct tendency, such that the mean
during the first 5 minutes varies by 100 m or more
from the mean during the second 5 minutes of the
　
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