The thirteen edition incorporates changes resulting from Amendments 79 and 80 to Annex 3, developed by the Meteorology Panel. It contains guidance related to improved harmonization of SIGMET information, to tropical cyclone advisory and related SIGMET information (including a new Appendix K), and to the provision of OPMET information in the ICAO Meteorological Information Exchange Model (IWXXM) geography markup language (GML) form.

The body of the manual is based primarily on Annex 3, summarized and enlarged upon where necessary. The appendices provide information on other subjects such as location of instruments at aerodromes and use of meteorological information by operators and flight crew members.

It should be stressed that the material in this manual is intended for guidance only. It is not intended to replace relevant national instructions or explanatory material, nor is it intended to cover the many non-aeronautical uses of meteorological information. Nothing in this manual should be taken as contradicting or conflicting with Annex 3 provisions or any other Standards, Recommended Practices, procedures or guidance material published by ICAO or WMO. It should also be noted that in this manual the words “shall” and “should” are not used in a regulatory sense as in ICAO or WMO regulatory documents.

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