| Abbreviation | Definition |
|---|---|
| AMAP | Arctic Monitoring and Assessment Programme |
| AMC | Army Materiel Command |
| AMDAR | Automatic Meteorological Data and Reporting |
| AMIDS | Aviation Meteorological Information Dissemination System |
| AMIS | Advanced Meteorological Information System |
| AMMA | African Monsoon Multidisciplinary Analyses |
| AMRC | Antarctic Meteorological Research Center |
| AMS | American Meteorological Society |
| AMSR | Advanced Microwave Scanner Radiation |
| AMSS | Automatic Meteorological Sensors System |
| AMU | Applied Meteorology Unit |
| AMU | Area of Magnetic Unreliability |
| ANARE | Australian National Antarctic Research Expedition |
| ANC | Air Navigation Commission |
| ANG | Air National Guard |
| ANNSOCMETEOR | Annuaire de la Societe Meteorologique de France |
| AOG | Acts Of God |
| AOGCM | Atmosphere Ocean General Circulation Model |
| AOIPS | Atmospheric and Oceanographic Image Processing System |
| AOML | Atlantic Oceanographic and Meteorological Laboratories |