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Recommendation.- An agreement between the meteorological
authority and the appropriate ATS authority should be
established to cover; amongst other things:
a) the provision in air traffic services units of displays
related to integrated automatic systems;
ANNEX 3
Annex 3 - Meteorological Service for International Air Navigation Chapter 4
b) the calibration and maintenance of these displays/
instruments;
c) the use to be made of these displays/instruments by air
traflc services personnel;
d) as and where necessary, supplementary visual
observations for example, of meteorological phenomena
of operational significance in the climb-out and
approach areas) if and when made by air traflc
services personnel to update or supplement the
information supplied by the meteorological station;
4.4 Special observations and reports
4.4.1 A list of criteria for special observations shall be
established by the meteorological authority, in consultation
with the appropriate ATS authority, operators and others
concerned.
4.4.2 Reports of special observations shall be issued as:
a) local special reports, only for dissemination at the
aerodrome of origin, (intended for arriving and
departing aircraft); and
b) SPECI for dissemination beyond the aerodrome of
e) meteorological information obtained from aircrafi origin (mainly intended for flight planning, VOLMET
taking off or landing for example, on wind shear); and broadcasts and D-VOLMET).
8 if available, meteorological information obtained from Note.- Meteorological information used in ATZS (voiceground
weather radar. ATZS and D-ATZS) is to be extracted jivm the local special
report, in accordance with Annex 11, 4.3.6.1 g).
Note.- Guidance on the subject of coordination between
ATS and aeronautical meteorological services is contained in 4.4.3 At aerodromes that are not operational throughout
the Manual on Coordination between Air TraBc Services, 24 hours in accordance with 4.3.1, following the resumption
Aeronautical Information Services and Aeronautical of the issuance of METAR, SPECI shall be issued, as neces-
Meteorological Services (Doc 9377). sary.
4.3 Routine observations and reports 4.5 Contents of reports
4.3.1 At aerodromes, routine observations shall be made
throughout the 24 hours each day, except as otherwise agreed
between the meteorological authority, the appropriate ATS
authority and the operator concerned. Such observations shall
be made at intervals of one hour or, if so determined by
regional air navigation agreement, at intervals of one halfhour.
At other aeronautical meteorological stations, such
observations shall be made as determined by the meteorological
authority taking into account the requirements of air
traffic services units and aircraft operations.
4.3.2 Reports of routine observations shall be issued as:
4.5.1 Local routine and special reports and METAR and
SPECI shall contain the following elements in the order
indicated:
a) identification of the type of report;
b) location indicator;
C) time of the observation;
d) identification of an automated or missing report, when
applicable;
a) local routine reports, only for dissemination at the e) surface wind direction and speed;
aerodrome of origin, (intended for arriving and
departing aircraft); and f ) visibility;
b) METAR for dissemination beyond the aerodrome of g) runway visual range, when applicable;
origin (mainly intended for flight planning, VOLMET
broadcasts and D-VOLMET). h) present weather;
Note.- Meteorological information used in ATZS (voice- i) cloud amount, cloud type (only for cumulonimbus and
ATZS and D-ATZS) is to be extracted from the local routine towering cumulus clouds) and height of cloud base or,
report, in accordance with Annex 11, 4.3.6.1 g). where measured, vertical visibility;
4.3.3 At aerodromes that are not operational throughout j) air temperature and dew-point temperature; and
24 hours in accordance with 4.3.1, METAR shall be issued
prior to the aerodrome resuming operations in accordance with k) QNH and, when applicable, QFE (QFE included only in
regional air navigation agreement. - local routine and special reports).
Chapter 4 Annex 3 - Meteorological Service for International Air Navigation
Note.- The location indicators referred to under b) and 4.6.3 Runway visual range
their significations are published in Location Indicators
(Doc 791 0). Note.- Guidance on the subject of runway visual range is
contained in the Manual of Runway Visual Range Observing
4.5.2 Recommendation.- In addition to elements listed and Reporting Practices pot 9328).
under 4.5.1 a) to k), local routine and special reports and
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