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| S | South or southern latitude |
|---|---|
| SA | Surface observation or Sand |
| SACSMA | Sacramento Soil Moisture Accounting Model |
| SAO | Surface observation |
| SAOS | Surface observations |
| SAP | As soon as possible |
| SARPS | Standards and Recommended Practices (ICAO) |
| SASK | Saskatchewan |
| SAT | Saturday |
| SATFY | Satisfactory |
| SAW | Preliminary Notification of Forthcoming Watch |
| SAWRS | Supplementary Aviation Weather Reporting Station |
| SB | Southbound |
| SBCAPE | CAPE calculated using a Surface based parcel |
| SBLI | Lifted Index (LI) calculated using surfaced based parcel |
| SBND | South bound |
| SBSD | Subside |
| SBSDD | Subsided |
| SBSDNC | Subsidence |
| SBSDS | Subsides |
| Sc | Stratocumulus |
| SC | South Carolina or Stratocumulus |
| SCA | Small Craft Advisory |
| SCC | Tropical Storm Summary |
| SCND | Second |
| SCNDRY | Secondary |
| SCS | Spectrum Width Cross Section or Soil Conservation Service |
| SCSL | Standing lenticular stratocumulus |
| SCT | Scattered |
| SCTD | Scattered |
| SCTR | Sector |
| SD | Storm Data or South Dakota |
| SDF | Second-Day Feet |
| SDM | Senior Duty Meteorologist or Station Duty Manual |
| SE | Southeast |
| SEB | South-eastbound |
| SEC | Second, or seconds |
| SEL | Severe Thunderstorm Watch, Tornado Watch |
| SEL | Watch Cancellation |
| SELS | SEvere Local Storms Unit |
| SELY | Southeasterly |
| SEP | September |
| SEPN | Separation |
| SEQ | Sequence |
| SERN | Southeastern |
| SEV | Severe (used e.g. to qualify icing and turbulence reports) |
| SEWD | Southeastward |
| SFC | Surface |
| SFD | State Forecast Discussion |
| SFERICS | Atmospherics |
| SFP | State Forecast Product |
| SG | Snow Grains |
| SGFNT | Significant |
| SGFNTLY | Significantly |
| SH... | Shower (followed by RA = rain, SN = snow, PE = ice pellets) |
| SHARP | Skew-T Hodograph Analysis and Research Program |
| SHARS | Subtle Heavy Rainfall Signature |
| SHEF | Standard Hydrologic Exchange Format |
| SHEFPARS | A software decoder for SHEF Data. |
| SHFT | Shift |
| SHFTD | Shifted |
| SHFTG | Shifting |
| SHFTS | Shifts |
| SHLD | Shield |
| SHLW | Shallow |
| SHRT | Short |
| SHRTLY | Shortly |
| SHRTWV | Shortwave |
| SHRTWVS | Shortwaves |
| SHSN | Snow Shower |
| SHUD | Should |
| SHWR | Shower |
| SHWRS | Showers |
| SIERNEV | Sierra Nevada |
| SIG | Signature |
| SIGMET | SIGnificant METeorlogical Information |
| SIGWX | Significant weather |
| SIMUL | Simultaneous or simultaneously |
| SKC | Sky clear |
| SKED | Schedule or scheduled |
| SLD | Solid |
| SLGT | Slight |
| SLGTLY | Slightly |
| SLO | Slow |
| SLOLY | Slowly |
| SLOR | Slower |
| SLP | Slope |
| SLPG | Sloping |
| SLS | Watch Redefining Statement |
| SLT | Sleet |
| SLW | Slow |
| SLY | Southerly |
| SM | Statute mile |
| SMA | Soil Moisture Accounting Model or Subtropical Forecast/Advisory |
| SMK | Smoke |
| SML | Small |
| SMLR | Smaller |
| SMPDBK | The Simplified Dam Break (DAMBRK) Model |
| SMRY | Summary |
| SMS | Synchronous Meteorological Satellite |
| SMTH | Smooth |
| SMTHR | Smoother |
| SMTHST | Smoothest |
| SMTM | Sometime |
| SMW | Special Marine Warning |
| SMWHT | Somewhat |
| SN | Snow |
| SNBNK | Snow bank |
| SND | Sand |
| SNFLK | Snow flake |
| SNGL | Single |
| SNOINCR | Snow increase |
| SNOINCRG | Snow increasing |
| SNOTEL | SNOw TELemetry |
| SNR | Signal-to-Noise Ratio |
| SNST | Sunset |
| SNW | Snow |
| SNWFL | Snowfall |
| SO | Southern Oscillation |
| SOO | Scientific & Operations Officer |
| SOLAS | Safety of Life at Sea Convention |
| SOP | Standard operating procedure |
| SP | Snow pellets |
| SPA | Subtropical Cyclone Public Advisory |
| SPC | Storm Prediction Center |
| SPCLY | Especially |
| SPD | Speed |
| SPDS | Speeds |
| SPECI | Aviation selected special weather report (in aeronautical meteorological code) |
| SPECIAL | Special meteorological report (in abbreviated plain language) |
| SPENES | Satellite precipitation estimate statement |
| SPF | Probability of Tropical Cyclone Conditions |
| SPKL | Sprinkle |
| SPKLS | Sprinkles |
| SPLNS | Southern Plains |
| SPOT | Spot wind |
| SPRD | Spread |
| SPRDG | Spreading |
| SPRDS | Spreads |
| SPRL | Spiral |
| SPS | Severe Weather Potential Statement or Special Weather Statement |
| SQ | Squall |
| SQAL | Squall |
| SQLN | Squall line |
| SQSN | Snow Squalls |
| SR | Sunrise |
| SRH | Storm-relative Helicity. |
| SRM | Storm Relative Mean Radial Velocity Map |
| SRN | Southern |
| SRND | Surround |
| SRNDD | Surrounded |
| SRNDG | Surrounding |
| SRNDS | Surrounds |
| SRR | Storm Relative Mean Radial Velocity Region |
| SRY | Secondary |
| SS | Sandstorm or sunset |
| SSE | South-southeast |
| SSELY | South-southeasterly |
| SSERN | South-southeastern |
| SSEWD | South-southeastward |
| SSHP | Site Specific Hydrologic Prediction System |
| SST | sea surface temperature |
| SSW | South southwest |
| SSWLY | South-southwesterly |
| SSWRN | South-southwestern |
| SSWWD | South-southwestward |
| St or ST | Stratus |
| STAGN | Stagnation |
| STBL | Stable |
| STBLTY | Stability |
| STD | Standard |
| STDY | Steady |
| STF | Stratiform |
| STFR | Stratus fractus |
| STFRM | Stratiform |
| STG | Strong |
| STGLY | Strongly |
| STGR | Stronger |
| STGST | Strongest |
| STI | Storm Tracking Information |
| STLT | Satellite |
| STM | Storm |
| STMS | Storms |
| STN | Station |
| STN | Station |
| STNR | Stationary |
| STNRY | Stationary |
| STNS | Stations |
| STP | Storm Total Precipitation |
| SUB | Substitute |
| SUBTRPCL | Subtropical |
| SUF | Sufficient |
| SUFLY | Sufficiently |
| SUG | Suggest |
| SUGG | Suggesting |
| SUGS | Suggests |
| SUN | Sunday |
| SUP | Supply |
| SUPG | Supplying |
| SUPR | Superior |
| SUPS | Supplies |
| SUPSD | Supersede |
| SUPSDG | Superseding |
| SUPSDS | Supersedes |
| SVG | Serving |
| SVR | Severe Thunderstorm Warning or Severe |
| SVRL | Several |
| SW | Southwest or Spectrum Width |
| SWA | Severe Weather Analysis (SWA) |
| SWB | South-westbound |
| SWD | Southward |
| SWE | Snow Water Equivalent |
| SWEAT Index | Severe WEAther Threat Index |
| SWI | Showalter Index |
| SWLG | Swelling |
| SWLY | Southwesterly |
| SWO | SPC Mesoscale Discussions or Convective Outlook |
| SWODY1 | Day 1 Convective Outlook |
| SWODY2 | Day 2 Convective Outlook |
| SWOMCD | SELS Mesoscale Discussion |
| SWP | Severe Weather Probability |
| SWPC | Space Weather Prediction Center |
| SWR | State Weather Roundup |
| SWRN | Southwestern |
| SWS | Severe Weather Statement |
| SWWD | Southwestward |
| SX | Stability index |
| SXN | Section |
| SXNS | Sections |
| SYNOP | Synoptic |
| SYNS | Synopsis |
| SYS | System |
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