| Abbreviation | Definition |
|---|---|
| ACVT | Atmospheric Chemistry Validation Team |
| AD | Air Density |
| AD | Anomalous Dispersion |
| ADAS | AWOS/ASOS Data Acquisition System |
| ADDS | Aviation Digital Data Service |
| ADEOS | Advanced Earth Observing System |
| ADFC | Altimetry Data Fusion Center |
| ADLP | Aeronautical Data Link Program |
| ADMS | Atmospheric Dispersion Modelling System |
| ADR | All Day Rain |
| ADS | All Directional Shower |
| ADTS | Air Data Test Set |
| ADW | Average Dry Weather |
| ADWF | Average Dry Weather Flow |
| ADWS | Automatic Digital Weather Switch |
| AETC | Atmospheric Environment Technical Committee |
| AF | Air Force |
| AFB | Air Force Base |
| AFCCC | Air Force Combat Climatology Center |
| AFD | Area Forecast Discussion |