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flight planning in extended range operations; quantitative definitions of CB
clouds and thunderstorms to be used in WAFS SIGWX charts and
consequential amendments to guidance material.
23 March 1992
27 July 1992
12 November 1992;
1 July 1993
17 March 1995
24 July I995 . .
1 January 1996
11 March 1998
20 July 1998
5 November 1998
Annex 3 - Meteorological Service for International Air Navigation Foreword
Adopted/approved
Effective
Applicable
72 Limited Middle East
(14th Edition) (COM/MET/RAC)
RAN Meeting
(1996). Ninth
meeting of the
ASIABAC Air
Navigation
Planning and
Implementation
Regional Group,
-' l'hirty-iixih, thirtyninth
and fortieth
meetings of the
European Air
Navigation Planning
Group. International
Air Transport
Association.
Secretariat
Changes to the definition of flight crew member, grid point data in numerical
form, pilot-in-command, regional area forecast centre and world area
forecast centre; introduction of definitions for minimum sector altitude,
quality assurance, quality control, quality management, quality system and
visibility; introduction of requirements regarding global exchange of
OPMET information; updated format for volcanic ash and tropical cyclone
advisory messages; introduction of requirements on the transmission of
information on the accidental release of radioactive materials, inclusion of
radiation symbol on WAFS SIGWX charts; updated operational
requirements for world area forecast system (WAFS) data regarding the
frequency of issuance of WAFS upper windftemperature data increased to
four times per day; inclusion of FL 140 and humidity in the GRIB global
data, introduction of the BUFR code, inclusion of "strong surface winds" and
"mountain obscuration" symbols on low-level SIGWX charts; operational
requirements for aeronautical MET codes regarding the introduction of
standardized VOLMET phraseologies, uniform use of dateltime groups in
METAR and TAF code forms, additional reference level for height of clouds
and freezing level in GAMET messages, discrimination between
improvements and deterioration of visibility, cloud base 'and vertical
visibility in aerodrome reports and forecasts; introduction of templates for
local meteorological report, METARISPECI, TAF and SIGMET; the
algorithm to report. turbulence and provision of a turbulence index, and the
operational interpretation of turbulence index; provisions for the MET
component for automated pre-flight information systems and harmonized
AISMET pre-flight briefing; provisions regarding quality assurance and
quality control of MET information; SIGMET information in graphical
format and quantitative criteria for SIGMET messages; inclusion of forwardscatter
meters in RVR provisions; and editorial amendments.
73 Meteorology (MET)- Restructuring of Annex 3 into two parts; new and amended definitions;
(15th Edition) Divisional Meeting upgrading of certain Recommended Practices to Standards; elimination of
(2002). the need to issue WAFS products in T4 chart form; introduction of the
Secretariat requirement to maintain the integrity of WAFS forecasts; notification of
volcanic activity to ACC, MWO and VAAC by selected State volcano
observatories; introduction of provisions allowin-g the issuance of SIGMET
messages for volcanic ash and tropical cyclones in graphical format using the
WMO BUFR code form; introduction of templates for special air-report
(downlink), volcanic ash and tropical cyclone advisory messages and
aerodrome and wind shear warnings;,introduction of a requirement to issue
METARs and SPECIs prior to the aerodrome resuming operations;
introduction of enabling provisions to use fully automatic obsening systems
during non-operational hours; introduction of prevailing visibility;
introduction of a requirement to cancel aerodrome forecasts that cannot be
kept under continuous review; introduction of a provision for the averaging
period for measuring visibility and variation in the mean wind speed;
introduction of a provision to use maximum light intensity for assessment of
RVR for METAR and SPECI; the deletion of Model TB Example 2;
inclusion of new Examples 3 and 4 under Model SWH, deletion of
7 March 2001
16 July 2001
1 November 2001
25 February 2004
12 July 2004
25 November 2004
Attachment A; introduction of a new Attachment C describing back-up
procedures at WAFCs; and editorial amendments.
INTERNATIONAL STANDARDS AND RECOMMENDED PRACTICES
PART I
CORE SARPs
CHAPTER 1. DEFINITIONS
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