| Abbreviation | Definition |
|---|---|
| NWL | Normal Water Level |
| NWLON | National Water-Level Observation Network |
| NWP | NorthWest Passage |
| NWP | Numerical Weather Prediction |
| NWR | NOAA Weather Radio |
| NWS | National Weather Service |
| OAML | Oceanographic and Atmospheric Master Library |
| OASIS | Oceanographic and Atmospheric Support and Information System |
| OASIS | Optimization Of Aquifer Storage For Increased Supply |
| OAT | Outside Air Temperature |
| ODCSINT | Office of the Deputy Chief of Staff for Intelligence |
| ODCSOPS | Office of the Deputy Chief of Staff for Operations |
| OGA | Ozone Gas Analyzer |
| OKX | National Weather Service Forecast Office - Upton, NY |
| OL | Office Lady |
| OLR | out-going long radiation |
| OMB | Office of Management and Budget |
| OMC | Other Moisture Content |
| OMEGA | Office of the MAP Experiment General Archive |
| OMEGA | Organisation Of Malay Ex Gangsters And Addicts |