Snow
SNOWTAM A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of specific format
SPECI Aviation selected special weather report (in aeronautical meteorological code)
SPL Supplementary flight plan message
SPOC SAR point of contact
SQ Squall
SQL Squall line
SR Sunrise
SRE Surveillance Radar
SRG Short range
SRR Search and rescue region
SS Sunset
SSE South-southeast
SSR Secondary surveillance radar
SST Supersonic transport
SSW South-southwest
ST Stratus
STA Straight in approach
STA Scheduled time of arrival (aircraft on blocks)
STAR Standard (instrument) arrival
STD Scheduled time of departure (aircraft off blocks)
STF Step down fix
STOL Short take-off and landing
STS Status
SUBJ Subject to
Sun Sunday
SUPPS Regional supplementary procedures
SVC Service message
SVCBL Serviceable
SW Southwest
SWC Significant weather chart
SWY Stopway
T
t Ton(s) (weight)
T Temperature
TA Transition altitude
TACAN UHF Tactical Air Navigation Aid
TAF Aerodrome forecast
TAR Terminal area surveillance radar
TAS True airspeed
TAX Tyxiing or taxi
TC Tropical cyclone
TCAS Traffic Alert and Collision Avoidance System
TCH Threshold crossing height
TCU Towering cumulus
TDZ Touchdown zone
TEL Telephone
TEMPO Temporary or temporarily
TFC Traffic
TGL Touch-and-go landing
THR Threshold
Thu Thursday
TIL Until
TKOF Take-off
TLOF Touchdown and lift-off area
TMA Terminal control area
TMZ Transponder Mandatory Zone
TODA Take-off distance available
TOP Cloud top
TORA Take-off run available
TP Turning point
TR Track
TRA Temporary reserved airspace
TRANS Transmits or transmitter
TS Thunderstorm
TSGR Thunderstorm with hail
TSSA Thunderstorm with duststorm or sandstorm
TT Teletypewriter
Tue Tuesday
TURB Turbulence
TVOR Terminal VOR
TWP Turning waypoint
TWR Aerodrome control tower or aerodrome control
TWY Taxiway
TXT Text
TYP Type of aircraft
U
UAC Upper area control centre
UDF UHF direction finding station
UFN Until further notice
UHF Ultra high frequency (300 to 3000 MHz)
UIC Upper information centre
UIR Upper information region
UNL Unlimited
UNREL Unreliable
U/S Unserviceable
USAFE US Air Force – Europe
USAEUR US Army – Europe
UTA Upper control area
UTC Co-ordinated Universal Time
V
VA Volcanic Ash
VAL Visual approach and landing chart
VAR Magnetic variation
VASIS Visual approach slope indicator system
VDF VHF direction finding station
VFR Visual flight rules
VHF Very high frequency (30 MHz to 300 MHz)
VIA By way of …
VIO Severe (used to qualify interference or static reports)
VIP Very important person
VIS Visibility
VLR Very long range
VMC Visual meteorological condition
VOLMET Meteorological information for aircraft in flight
VOR VHF Omnidirectional radio range
VORTAC VOR and TACAN combination
VOT VOR airborne equipment test facility
VRB Variable
Vs Stalling speed
VTOL Vertical take-off and landing
W
W West or western longitute
W White
WAFC World Area Forecast Centre
WAFS World Area Forecast System
WDI Wind direction indicator
Wed Wednesday
WEF With effect from or effective from
WGS World Geodetic System
WIE With immediate effect or effective immediately
WIP Work in progress
WNW West-northwest
WS Wind Sheer
WSPD Wind speed
WSW West-southwest
W/T Wind/temperature
WX Weather
X