| Abbreviation | Definition |
|---|---|
| MRC | Muddy Rain Conditions |
| MRS | Miniature Rawinsonde System |
| MS | Monitoring the Stratosphere |
| MSC | Meteorological Service of Canada |
| MSCP | Meteorological and Climate Services Project |
| MSCW | Meteorological Synthesizing Centre West |
| MSLP | Mean Sea Level Pressure |
| MSM | Magnetospheric Specification Model |
| MSTR | Moisture |
| MSU | Microwave Sounding Unit |
| MSWN | Mid-South Weather Network |
| MTF | Model Test Facility |
| MTN | Main Telecommunications Network |
| MTSAT | Multi-functional Transport Satellite |
| MTSO | Meteorological Telecommunications System Offenbach |
| MVP | Maximum Vertical Pocket |
| MW | Moderately weathered |
| MWC | Meters of Water Column |
| MWFRS | Main Wind Force Resisting System |
| MWL | Maximum Water Level |