Name: Annex 3. Edition 21. Meteorological Service for International Air Navigation
Brand: International Civil Aviation Organization
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Annex 3. Edition 21

Last modified:11/27/2025

Meteorological Service for International Air Navigation

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INTERNATIONAL CIVIL AVIATION ORGANIZATIONAnnex 3Practices, see the Foreword.For information regarding the applicability of the Standards and Recommended This edition supersedes, on 27 November 2025, all previous editions of Annex 3.Twenty-First Edition, August 2025to the Convention on International Civil AviationMeteorological Service for International Air NavigationInternational Standardsand Recommended Practices

Published in separate English, Arabic, Chinese, French, Russian and Spanish editions by the INTERNATIONAL CIVIL AVIATION ORGANIZATION 999 Robert-Bourassa Boulevard, Montral, Quebec, Canada H3C 5H7 For ordering information and for a complete listing of sales agents and booksellers, please go to the ICAO website at www.icao.int First Edition, 1948 Twentieth Edition, 2018 Twenty-First Edition, 2025 Annex 3 Meteorological Service for International Air Navigation Order Number AN 3 ISBN 978-92-9275-706-9 print version ISBN 978-92-9275-857-8 electronic version ICAO 2025 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, without prior permission in writing from the International Civil Aviation Organization.

iii AMENDMENTS Amendments are announced in the supplements to the Products and Services Catalogue the Catalogue and its supplements are available on the ICAO website at www.icao.int. The space below is provided to keep a record of such amendments. RECORD OF AMENDMENTS AND CORRIGENDA AMENDMENTS CORRIGENDA No. Date applicable Date entered Entered by No. Date of issue Date entered Entered by 1-82 Incorporated in this edition 1 20/10/25 20/10/25 ICAO

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Table Of Contents

Cover Page

AMENDMENTS

RECORD OF AMENDMENTS AND CORRIGENDA

CONTENTS

FOREWORD

CHAPTER 1. DEFINITIONS

1.1 Definitions

1.2 Terms used with a limited meaning

CHAPTER 2. GENERAL PROVISIONS

2.1 Objective, determination and provision of meteorological service

2.2 Supply, use, quality management and interpretation of meteorological information

2.3 Notifications required from operators

CHAPTER 3. GLOBAL SYSTEMS, SUPPORTING CENTRES AND METEOROLOGICAL OFFICES

3.1 World area forecast centres within the framework of the world area forecast system

3.2 Aerodrome meteorological offices

3.3 Meteorological watch offices

3.3.2 An MWO shall:

3.4 Volcanic ash advisory centres

3.5 State volcano observatories

3.6 Tropical cyclone advisory centres

3.7 Space weather centres

CHAPTER 4. AERODROME METEOROLOGICAL OBSERVATIONAL INFORMATION

4.1 Aeronautical meteorological stations and observations

4.2 Agreement between meteorological service provider and appropriate air traffic services authority

4.3 Routine observations and reports

4.4 Special observations and reports

4.5 Characteristics of meteorological reports

4.6 Observing and reporting meteorological elements

4.6.1 Surface wind

4.6.2 Visibility

4.6.3 Runway visual range

4.6.4 Present weather

4.6.5 Clouds

4.6.6 Air temperature and dew-point temperature

4.6.7 Atmospheric pressure

4.6.8 Supplementary information

4.7 Reporting meteorological information from automatic observing systems

4.8 Observing and reporting volcanic activity

4.9 Dissemination of meteorological reports

4.9.1 METAR and SPECI

4.9.2 Local routine report and local special report

CHAPTER 5. AIRCRAFT METEOROLOGICAL OBSERVATIONAL INFORMATION

5.1 Obligations of States

5.2 Types of aircraft observations

5.3 Routine aircraft observations – designation

5.4 Routine aircraft observations – exemptions

5.5 Special aircraft observations

5.6 Other non-routine aircraft observations and reports

5.7 Reporting of aircraft observations

5.8 Relay of air-reports by air traffic services units

5.9 Dissemination of air-reports

CHAPTER 6. AERODROME AND EN-ROUTE METEOROLOGICAL FORECAST INFORMATION

6.1 Use of forecasts

6.2 Aerodrome meteorological forecast information

6.2.1 Aerodrome forecasts (TAF)

6.2.2 Landing forecasts (trend forecasts)

6.2.3 Forecasts for take-off

6.3 En-route meteorological forecast information

6.3.1 Forecasts by world area forecast centres

6.3.2 Area forecasts for low-level flights (GAMET and area forecasts in chart form)

6.3.3 Forecasts by volcanic ash advisory centres

CHAPTER 7. METEOROLOGICAL INFORMATION CONTAINING ADVISORIES, ALERTS, WARNINGS AND NOTICES

7.1 Volcanic ash advisory information and information from State volcano observatories

7.2 Tropical cyclone advisory information

7.3 Space weather advisory information

7.4 SIGMET information

7.4.1 General provisions

7.4.2 Dissemination of SIGMET information

7.5 AIRMET information

7.5.1 General provisions

7.5.2 Dissemination of AIRMET information

7.6 Aerodrome warnings

7.6.1 General provisions

7.6.2 Dissemination of aerodrome warnings

7.7 Wind shear warnings and alerts

7.7.1 General provisions

7.7.2 Dissemination of wind shear warnings and alerts

CHAPTER 8. AERONAUTICAL CLIMATOLOGICAL INFORMATION

8.1 General provisions

8.2 Aerodrome climatological tables

8.3 Aerodrome climatological summaries

8.4 Copies of meteorological observational data

8.5 Exchange of aeronautical climatological information

CHAPTER 9. METEOROLOGICAL SERVICE FOR OPERATORS AND FLIGHT CREW MEMBERS

9.1 General provisions

9.2 Briefing, consultation and display

9.3 Flight documentation

9.4 Automated pre-flight information systems for briefing, consultation, flight planning and flight documentation

9.5 Meteorological information for aircraft in flight

CHAPTER 10. METEOROLOGICAL INFORMATION FOR AIR TRAFFIC SERVICES, SEARCH AND RESCUE SERVICES AND AERONAUTICAL INFORMATION SERVICES

10.1 Information for air traffic services units

10.1.1 General

10.1.2 Supply, dissemination and transmission arrangements

10.2 Information for search and rescue services units

10.2.1 General

10.2.2 List of information

10.3 Information for aeronautical information services units

10.3.1 General

10.3.2 List of information

CHAPTER 11. USE OF COMMUNICATIONS TO EXCHANGE METEOROLOGICAL INFORMATION

11.1 Requirements for communications

11.2 Use of aeronautical fixed service communications and the public Internet

11.2.1 Meteorological bulletins

11.2.2 World area forecast system forecasts

11.3 Use of aeronautical mobile service communications

11.4 Use of aeronautical data link service – D-VOLMET

11.5 Use of aeronautical broadcasting service – VOLMET broadcasts