| Abbreviation | Definition |
|---|---|
| RSMC | Regional Specialized Meteorological Centres |
| RSMC | Regional/ Specialized Meteorological Center |
| RT | Realtime Trend |
| RTA | Radar Terrain Analysis |
| RTE | Radioactive Transfer Equation |
| RTH | Regional Telecommunications Hub |
| RUC | Rapid Update Cycle |
| RVR | Runway Visual Range |
| RWB | Rainwater Basin |
| RWH | Rain Water Harvesting |
| RWIS | Road Weather Information System |
| RWO | Range Weather Operations |
| RWP | Radar Wind Profiler |
| RWT | Ris Wemsar Tool |
| S | Snow |
| S | Sunshine |
| SAAR | Standard period Average Annual Rainfall |
| SAC | Surface Air Consumption |
| SAF | Subantarctic Front |
| SALSA | Semi Arid Land Surface Atmosphere |