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Subject (s)
Adopted/approved
Elfctive
Applicable
69 Communications/
(1 1 th Edition) Meteorology1
Operations
Divisional Meeting
(1990). ICAO
Secretariat
70 Communications/
(12th Edition) Meteorologyl
Operations
Divisional Meeting
(1990). Limited
North Atlantic
(COM/MET/RAC)
Regional Air
Navigation Meeting
(1992). Third Asid
Pacific Regional Air
Navigation Meeting
(1993). Thirtysecond
meeting of
the European Air
Navigation Planning
Group. ICAO
Secretariat
71 Limited North
(13th Edition) Atlantic (COMI
MET/RAC)
Regional Air
Navigation Meeting
(1992). Third Asid
Pacific Regional Air
Navigation Meeting
(1993). Thirtyeighth
meeting of
the European Air
Navigation Planning
Group (EANPGl38).
United States. ICAO
Secretariat
Amendment of the provisions related to the transition to the final phase of
the WAFS; aeronautical meteorological codes, and guidance material on the
selected criteria applicable to aerodrome reports; aeronautical climatological
information; SIGMET information and related guidance material for the
issuance of SIGMETs; automatic weather observing stations; meteorological
information for helicopter operations; and alignment with Annex 6, Parts I
and I1 in respect of the definition for alternate aerodrome.
Definitions of AIRMET information, extended range operation, GAMET
area forecast, operational control and tropical cyclone; amendment to the
provisions concerning horizontal resolution of and the code form in which
the upper wind and temperature grid point forecasts are to be prepared by the
world area forecast centres; issuance of special reports for changes in
temperature at aerodromes; provisions related to the reporting and
forecasting of meteorological information at aerodromes on which the new
aeronautical meteorological codes are based and a consequential amendment
to Models Al, A2, TAl, TA2 and SN to take account of the updated
aeronautical meteorological codes; automated air reporting; provision of
information on weather phenomenon hazardous to low-level flights;
introduction of the minimum threshold value for the maximum surface wind
speed for which SIGMETs for tropical cyclones should be issued;
observation and reporting of wind shear to take account of new technology
in ground-based wind shear observing equipment; interregional exchange of
METARs and SPECIs to support extended range operations and long-haul
flights conducted under centralized operational control; editorial
amendments to replace the term "line squall" by "squall line"; editorial
amendments to Models SWL and SN, to align the depiction of freezing level,
and editorial corrections to Model A2; inclusion in Model SN of symbols for
"volcanic eruptions", "state of the sea" and "sea surface temperature";
updating ope~tionallyd esirable accuracy of measurement or dbservation and
the currently attainable accuracy of measurement or observation;
introduction of criteria for the inclusion of severe mountain waves in
SIGMET information.
Definitions of automatic dependent surveillance, Human Factors principles,
international airways volcano watch, level, tropical cyclone advisory centre,
volcanic ash advisory centre and VOLMET data link service; amendment to
the provisions regarding the indication of the designated meteorological
authority in States' AIPs; introduction of the role of the Human Factors
principles; inclusion of 6-hour and 36-hour validity WAFS upper windl
temperature forecasts; introduction of requirements and a new model for
volcanic ash advisories in graphical format; specification of the frequency
of update of volcanic ash advisories and the specific role of VAACs and
TCACs; an editorial amendment to ensure consistency in the order of the
words "RVR" and "RWY"; an amendment to the present weather
abbreviations; introduction of the requirements regarding "VOLMET' data
link service; editorial amendments regarding air reporting; inclusion of
"forecast temperature" in aerodrome forecasts; introduction of requirements
for the standardization of area forecasts and flight documentation for lowlevel
flights and consequential amendments to the Appendix - Model
Charts and Forms; the deletion of the use of national language in connection
with SIGMET messages; introduction of requirements for the provision of
meteorological information by automated pre-flight information systems;
introduction of the provision of meteorological information for centralized
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