| Abbreviation | Definition |
|---|---|
| HSSTD | Historical Sea Surface Temperature Dataset |
| HTWS | Hawaii Tsunami Warning System |
| HUC | Hydrologic Unit Code |
| HUGO | Hawaii Undersea Geo Observatory |
| HURL | Hawaii Undersea Research Laboratory |
| HVL | Half Value Layer |
| HW | High Water |
| HW | Hydrothermal Wave |
| HWC | Hurricane Warning Center |
| HWCMO | Hawaii Weather and Climate Modeling Ohana |
| HWM | High Water Mark |
| HWO | Hurricane Warning Office |
| HY-SPLIT | Hybrid Single Particle Lagrangian Integrated Trajectories |
| I | Amperage |
| IABO | International Association for Biological Oceanography |
| IABP | International Arctic Buoy Program |
| IACOMS | International Advisory Committee on Marine Sciences |
| IADO | Instituto Argentino de Oceanograf?a |
| IAEA-MEL | IAEA Marine Environmental Laboratory |
| IAG | International Association of Geodesy |