| Abbreviation | Definition |
|---|---|
| GSM | Geocentric Solar Magnetospheric |
| GSOD | Global Surface summary Of the Day |
| GST | Gradient Surface Temperature |
| GTS | Global Telecommunications System |
| GTSPP | Global Temperature-Salinity Pilot Project |
| GTWAPS | Global Theater Weather Analysis and Prediction System |
| GVI | Green Vegetation Index |
| GW | Global Warming |
| GW | Ground Water |
| GWC | Geophysical Weather phenomena, unusual Clouds |
| GWC1 | Geophysical Weather phenomena, unusual Clouds: the White-Sky Phenomenon |
| GWC10 | Geophysical Weather phenomena, unusual Clouds: Anomalous Cloud Lines |
| GWC11 | Geophysical Weather phenomena, unusual Clouds: Dispersal of Clouds By the Moon |
| GWC12 | Unusual Clouds: The Morning Glory Phenomenon and Other Roll Clouds |
| GWC13 | Unusual Clouds: Long, Hollow, Cylindrical Clouds |
| GWC14 | Unusual Clouds: Cloud Spokes Radiating from Thunderclouds |
| GWC15 | Geophysical Weather phenomena, unusual Clouds: Excess of Ice Crystals In Cumulus Clouds |
| GWC16 | Geophysical Weather phenomena, unusual Clouds: Cloud Brightness Changes |
| GWC17 | Geophysical Weather phenomena, unusual Clouds: Anomalous High-Altitude Haze |
| GWC2 | Unusual Clouds: Cloud Arches |