| Abbreviation | Definition |
|---|---|
| MWM | Modified Wind Momentum |
| MWO | Meteorological Watch Office |
| MWP | Meteorologist's Weather Processor |
| MWS | Max Wind Speed |
| MWSS | Marine Wing Support Squadron |
| NACS | Neutral Atmosphere Composition Spectrometer |
| NACW | North Atlantic Central Waters |
| NADIN | National Airspace Data Interchange Network |
| NADP | National Atmospheric Deposition Program |
| NAH | North America Horizontal |
| NAK | Nutrition And Kids |
| NAMS | National Air Monitoring Station |
| NAMS | North American Monsoon System |
| NAO | North Atlantic Oscillation |
| NAOS | North American Atmospheric Observing System |
| NAP | Normal Atmospheric Pressure |
| NAR | Normal Annual Runoff |
| NAS | National Airspace System |
| NAS | North American Series |
| NASS | National Agricultural Statistics Service |