| Abbreviation | Definition |
|---|---|
| IFM | Ionospheric Forecast Model |
| IFMS | International Forum of Meteorological Societies |
| IFR | Instrument Flight Rules |
| IFS | Integrated Forecasting System |
| IHC | Interdepartmental Hurricane Conference |
| IIP | International Ice Patrol |
| IITA | Information Infrastructure Technology and Applications |
| IITM | Indian Institute of Tropical Meteorology |
| IJB | International Journal of Biometeorology |
| IMBO | Imbler Field Meteorological Observatory |
| IMC | Instrument Meteorological Cond |
| IMC | Instrument Meteorological Conditions |
| IMD | India Meteorological Department |
| IMD | Indian Meteorological Department |
| IMD | Indian Meteorological Dept |
| IMDES | Interdepartmental Meteorological Data Exchange System |
| IMETS | Integrated Meteorological System |
| IMF | Infuriatingly Misleading Forecasts |
| IMGI | Institute of Meteorology and Geophysics Innsbruck |
| IMHO | It's Mighty Hot Out! |