| Abbreviation | Definition |
|---|---|
| MDV | Meteorological Data Volume |
| MEHS | Maximum Expected Hail Size |
| MEMS | Micro Electro Mechanical System |
| MEPED | Medium Energy Proton and Electron Detector |
| MES | Marine Environmental Services |
| MET | Mobile Environmental Teams |
| METAR | MEteorological Terminal Aviation Routine Weather Report |
| METMF | Marine Corps Meteorological Mobile Facility |
| METOC | Meteorological and Oceanographic |
| MFD | Meteorological Forecasting Division |
| MFF | Minnesota Fast Freeze |
| MGR | Much Greater Range |
| MHG | Meteorological Hydrogen Generator |
| MHH | Meshalkin-Hochberg-Hirsch |
| MHS | Microwave Humidity Sensor |
| MIMR | Multifrequency Imaging Microwave Radiometer |
| MIR | Meteorological Interpolation and Regridding |
| MISR | Multi-angle Imaging SpectroRadiometer |
| MIUB | Meteorologisches Institut, Uni Bonn (German: Meteorological Institute, University of Bonn; Bonn, Germany) |
| MJO | Madden-Julian Oscillation |