| Abbreviation | Definition |
|---|---|
| FMI | Finnish Meteorological Institute, Finland |
| FNMOC | Fleet Numerical Meteorological and Oceanographic Center |
| FNMOC | Fleet Numerical Meteorology and Oceanography Center |
| FOG | Fats Oil And Grease |
| FORSCOM | U.S. Army Forces Command |
| FOSDIC | Film Optical Sensing Device for Input to Computer |
| FP | Front Polar |
| FRMAC | Federal Radiological Monitoring and Assessment Center |
| FS | Forest Service |
| FSAS | Flight Service Automation System |
| FSDPS | Flight Service Data Processing System |
| FSL | Full Supply Level |
| FSS | Flight Service Station |
| FTE | Full Time Equivalent |
| FTH | Free Tropospheric Humidity |
| FTMY | Future Typical Meteorological Year |
| FU | Forecast Unit |
| FU | Frost Up |
| FW | Field Wind |
| FW | FloodWater |