| Abbreviation | Definition |
|---|---|
| GLM1 | Geophysics Low-level Meteor-like Phenomena: Low-level Meteor-like Objects |
| GLM2 | Geophysics Low-level Meteor-like Phenomena: Darting Gleams of Light |
| GLMC | Great Lakes Meteorology Conference |
| GLOF | Glacial Lakes Outburst Flood |
| GLOFM | Glacial Lakes Outburst Flood Monitoring |
| GLOMEX | GLObal Meteorological EXperiment |
| GLOS | Great Lakes Observing System |
| GLOS-RA | Great Lakes Observing System Regional Association |
| GLW | Geophysics Luminous Phenomena over Water |
| GLW1 | Geophysics Luminous Phenomena over Water: Long, Parallel, Stationary, Phosphorescent Bands |
| GLW10 | Geophysics Luminous Phenomena over Water: Radar-Stimulated Phosphorescent Displays |
| GLW11 | Geophysics Luminous Phenomena over Water: Te Lapa: Underwater Lightning |
| GLW12 | Geophysics Luminous Phenomena over Water: Moving, V-shaped Phosphorescent Displays |
| GLW13 | Geophysics Luminous Phenomena over Water: Colored Rays Emanating from Ships |
| GLW14 | Geophysics Luminous Phenomena over Water: Radar Detection of Phosphorescence |
| GLW15 | Geophysics Luminous Phenomena over Water: Deep-Sea-Vent Glows |
| GLW2 | Geophysics Luminous Phenomena over Water: Moving, Parallel Bands of Phosphorescence |
| GLW3 | Geophysics Luminous Phenomena over Water: Aerial Phosphorescent Displays |
| GLW4 | Geophysics Luminous Phenomena over Water: Marine Phosphorescent Wheels |
| GLW5 | Geophysics Luminous Phenomena over Water: Expanding Phosphorescent Rings |