| Abbreviation | Definition |
|---|---|
| AFDD | Accumulated Freezing Degree Days |
| AFLR | Advancing Front Local Reconnection |
| AFR | Air Flow Research |
| AFSS | Automated Flight Service Station |
| AGCM | Atmospheric Global Climate Model |
| AGE | Advected Grid Explicit |
| AgriMet | Agricultural Meteorology |
| AGW | Anthropogenic Global Warming |
| AH | Absolute Humidity |
| AIDS | Air Improvement Disruption Syndrome |
| AIP | Airport Improvement Program |
| AIRS | Atmospheric Infrared Sounder |
| ALDARS | Automated Lightning Detection and Reporting System |
| ALDS | Automated Lightning Detection System |
| ALDS | Automatic Lightning Detection System |
| ALP | Anomalous Light Phenomena |
| ALR | Adiabatic Lapse Rate |
| ALWX | Alabama Weather |
| AM | Air Mass |
| AMA | AWIS Meteorological Applications |