| Abbreviation | Definition |
|---|---|
| SSF | Sunny Skies Forever |
| SSU | Stratospheric Sounding Unit |
| ST | Squall's Time |
| STAR | Satellite Applications and Research |
| STEPS | Severe Thunderstorm Electrification And Precipitation Study |
| STHP | Sub-Tropical High Pressure |
| STI | Storm Tracking Information Overlay |
| STIWG | Satellite Telemetry Interagency Working Group |
| SUPER | Students United Promoting Entertainment And Recreation |
| SVG | Sky Vs. Ground |
| SW | Severe Weather |
| SW | Slightly weathered |
| SWAT | Soil, Water, and Air Team |
| SWE | Snow Water Equivalent |
| SWEAT | Severe Weather Threat Index |
| SWIM | Solar Wind Interplanetary Measurements |
| SWN | Space Weather Now |
| SWO | Severe Weather Office |
| SWO | Staff Weather Officer |
| SWODY1 | Severe Weather Outlook Day 1 |