| Abbreviation | Definition |
|---|---|
| HDSS | Hierarchical Data Storage System |
| HED | howardite-eucrite-diogenite |
| HFRB | High Frequency Radio Broadcast |
| HHV | Highest High Value |
| HI | Heat Index |
| HID | High Intensity Discharge |
| HIRS/2 | High-resolution Infrared Sounder |
| HK | Hurricane Kick |
| HL | Hurricane Landcrash |
| HLACAM | High-Level Automatic Continuous Air Monitoring |
| HLACAMS | High-Level Automatic Continuous Air Monitoring System |
| HLB | High Latitude Boundary |
| HLBL | High Latitude Boundary Layer |
| HLC | High-Latitude Climate |
| HLCT | High-Latitude Climate Transects |
| HME | heat and moisture exchange |
| HME | Heat Moisture Exchange |
| HMP | Hot Mix Plant |
| HNMS | Hellenic National Meteorological Service |
| HOT | Hydrogen Oxygen Thermal |