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2) indicate that the runway tailwind and crosswind
components have changed through values representing
the main operating limits for typical aircrafi
operating at the aerodrome;
e) when the visibility is improving and changes to or
passes through one or more of the following values, or
when the visibility is deteriorating and passes through
one or more of the following values:
1) 800, 1 500 or 3 000 m; and
2) 5 000 m, in cases where significant numbers of
flights are operated in accordance with the visual
flight rules;
Note.- In local special reports, visibility refers to the
value(s) to be reported in accordance with 4.2.4.2 and
4.2.4.3, in SPECI, visibility refrs to the value(s) to be
reported in accordance with 4.2.4.4.
- fiezing precipitation
- moderate or heavy precipitation (including showers
thereof)
- duststorm
- sandstorm;
h) when the onset or cessation of any of the following
weather phenomena or combinations thereof occurs:
- ice crystals
-freezing fog
- low drifting dust, sand or snow
- blowing dust, sand or snow
- thunderstorm (with or without precipitation)
- squall
-funnel cloud (tornado or waterspout);
i) when the height of base of the lowest cloud layer of
BKN or OVC extent is lifting and changes to or passes
through one or more of the following values, or when
the height of base of the lowest cloud layer of BKN or
OVC extent is lowering and passes through one or more
of the following values:
1) 30,60, I50 or 300 m (100,200,500 or 1 000ft); and
2) 450 m (I 500 fi), in cases where significant numbers
offlights are operated in accordance with the visual
flight rules;
j) when the amount of a cloud layer below 450 m
(I 5OOft) changes:
I) from SKC, FEW or SCT to BKN or OVC; or
2) fhm BKN or OVC to SKC, FEW or SCZ and
k) when the sky is obscured and the vertical visibility is
improving and changes to or passes through one or
more of the following values, or when the vertical visibility
is deteriorating andpasses through one or more of
the following values: 30, 60, 150 or 300 m (100, 200,
500 or 1 000ft).
2.3.3 When a deterioration of one weather element is
accompanied by an improvement in another element, a single
SPECI shall be issued; it shall then be treated as a
deterioration report.
fi when the runway visual range is improving and changes
to or passes through one or more of the following 3. DISSEMINATION OF METEOROLOGICAL
values, or when the runway visual range is deteriorat- REPORTS
ing and passes through one or more of the following
values: 150, 350, 600 or 800 m;
3.1 METAR and SPECI
g) when the onset, cessation or change in intensity of any
of the following weather phenomena or combinations 3.1.1 METAR and SPEC1 shall be disseminated to
thereof occurs: international OPMET data banks and the centres designated
2511 1/04 APP 3- 2
Appendix 3 Annex 3 - Meteorological Service for International Air Navigation
by regional air navigation agreement for the operation of
aeronautical fixed service satellite distribution systems, in
accordance with regional air navigation agreement.
3.1.2 METAR and SPECI shall be disseminated to other
aerodromes in accordance with regional air navigation
agreement.
3.1.3 Recommendation.- SPECI representing a deterioration
in conditions should be disseminated immediately after
the observation. A SPECI representing an improvement in conditions
should be disseminated only after the improvement has
been maintained for 10 minutes; it should be amended befom
dissemination, ifnecessary, to indicate the conditions prevailing
at the end of that I &minute period. A SPECI representing
a deterioration of one weather element and an improvement in
another element should be disseminated immediately after the
observation.
3.2 Local routine and special reports
3.2.1 Local routine reports shall be transmitted to local air
traffic services units and shall be made available to the
operators and to other users at the aerodrome.
3.2.2 Local special reports shall be transmitted to local air
traffic services units as soon as the specified conditions occur.
However, by agreement between the meteorological authority
and the appropriate ATS authority, they need not be issued in
respect of:
a) any element for which there is in the local air traffic
services unit a display corresponding to the one in the
meteorological station, and where arrangements are in
force for the use of this display to update information
included in local routine and special reports; and
　
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