SHRT
SHRTWV
SHSN
SHWR
Sidelobe
SIGMET
signal-to-noise ratio
Significant wave height
Significant Weather Outlook
SIGWX
Single Cell Thunderstorm
SITOR
Sky Condition
SKYWARN
SL
| SLD
Sleet
Sleet Warning
SLGT
Slight Chance
Slight Risk
Sling Psychrometer
SLO
SLOSH
SLP
SLT
SLY
sm
SMA
Small Craft
|