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6 – i ndex
TS...
Thunderstorm (followedby
RA=rain, SN=snow, PE=ice
pellets, GR=hail, GS=small
hail and/or snow pellets or
combinations thereof eg
TSRASN= thunderstormwith
rain and snow
#TTF
TrendTypeForecast
TUE
Tuesday
TURB
Turbulence
+T-VASIS
“T” Visual ApproachSlope
Indicator System (pronounced
“TEE-VASIS”)
TWR
AerodromeControl Tower,
AerodromeControl
TWY
Taxiway
TWYL
Taxiway Link
TX
Indicator forMaximum
Temperature (MET-used inTAF
code form)
TYP
Type ofAircraft
TYPH
Typhoon
U
UAB
Until AdvisedBy
#UDF
UHFDirectionFindingStations
UFN
Until Further Notice
UHDT
UnableHigher DueTraffic
#UHF
UltraHighFrequency
(300 to 3 000MHZ)
UIR
Upper Flight Information
Region
UL
Upper Limits
UNA
Unable
UNAP
Unable toApprove
UNLC
Unlicensed
UNL
Unlimited
UNREL
Unreliable
UP
UnknownPrecipitation
U/S
Unserviceable
UTA
Upper Control Area
#UTC
CoordinatedUniversal Time
V
V
Variation frommeanwind
speed (MET-used inMETAR/
SPECI code forms)
VA
VolcanicAsh
VAAC VolcanicAshAdvisoryCentre
VAL
InValleys
VAR
MagneticVariation
+VASIS
Visual ApproachSlope
Indicator System
VCY
Vicinity
abbreviations and acronyms
CODE DEFINITION
CODE DEFINITION