| Abbreviation | Definition |
|---|---|
| NDI | Non Developmental Item |
| NDSI | Normalized Difference Snow Index |
| NDTI | Normalized Difference Temperature Index |
| NEMOC | Naval European Meteorology and Oceanography Center |
| NESDIS | National Environmental Satellite, Data, and Information Service |
| NESS | National Environmental Satellite Service |
| NEST | Nuclear Emergency Search Team |
| NEXRAD | National the Next Generation Weather Radar |
| NEXRAD | Next Generation Weather Radar |
| NFAF | National Forecast Adjustment Factor |
| NFDRS | National Fire Danger Rating System |
| NG | No Geocodes |
| NGIC | National Geomagnetic Information Center |
| NGP | North Geographic Pole |
| NHC | National Hurricane Center |
| NHOP | National Hurricane Operations Plan |
| NHV | Northern Hemisphere Version |
| NIC | National Ice Center |
| NIDS | NEXRAD (NEXt generation RADar) Information Dissemination Service |
| NIDS | NEXRAD Information Delivery System |