| Acronym | Meaning |
 | NEPH | Nephelometer |
| NEPRF | Naval Environmental Prediction Research Facility |
| NERC | National Environment Research Council |
| NESC | National Environmental Satellite Center |
| NESC | National Energy Software Corporation |
| NESDD | NOAA Earth Science Data Directory |
| NESDIS | National Earth Satellite Data And Information System |
| NESDIS | National Environmental Satellite Data And Information Service |
| NESS | National Earth Satellite Service |
| NET | Noise-equivalent Temperature |
| NETCDF | Network Common Data Form |
| NETS | Network Engineering And Telecommunications Section |
| NEWS | National Extreme Weather Systems |
| NEWS | NOAA Earth Watch Service |
| NEWS | Network Extensible Windows System |
| NEXAIR | Next Generation Upper Air System |
| NEXRAD | Next Generation Weather Radar |
| NEXRAD | Next Radar |
| NEXUS | Next Upper Air Sounder (system) |
| NEXUS | Next-generation Upper-air Sounding System |
| NEXUS | Navaid-based Upper- Air Sounding System |
| NFCR | Narrow Cold-frontal Rainbands |
| NFS | Network File System |
| NGDC | National Geophysical Data Center |
| NGI | Next Generation Internet |
| NGM | Nested Grid Model |
| NGO | Non-Government Organizations |
| NGS | National Geodetic Survey |
| NGT | NASA Ground Terminal |
| NGTG | NCAR GARP Task Group |
| NH | Northern Hemisphere |
| NHAP | National High Altitude Photography |
| NHC | National Hurricane Center |
| NHRE | National Hail Research Experiment |
| NHRL | National Hurricane Research Laboratory |
| NHSRP | National Hail Suppression Research Program |
| NIAR | National Institute For Atmospheric Research |
| NIC | Network Interface Card |
| NICI | Negative Ion Chemical Ionization |
| NIDS | NEXRAD Information Dissemination Service |
| NIDS | NEXRAD Information And Data System |
| NIES | National Institute Of Environmental Science |
| NIGEC | National Institute For Global Environmental Change |
| NIH | National Institute Of Health |
| NILU | Norwegian Institute For Air Research |
| NIMBUS | Networked Information Management Client-Based User Service |
| NIMROD | Northern Illinois Meteorological Research On Downbursts |
| NIP | National And International Program |
| NIPR | National Institute For Polar Research |
| NIR | Near IR |
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