$,maintenance check indicator
A/A,air-to-air
A/G,air-to-ground
A01,station without a precipitation discriminator
A02,station with a precipitation discriminator
AAF,Army Air Field
AAL,above aerodrome level
AAS,airport advisory service
AATM,at all times
AAWF,auxiliary aviation weather facility
AB,airbase
ABD,aboard
ABM,abeam
ABN,airport beacon
ABNDT,abundant
ABNML,abnormal
ABT,about
ABTMT,abatement
ABV,above
AC,altocumulus/air carrier
ACA,Arctic Control Area
ACARS,Aircraft Communication Addressing & Reporting System
ACAS,Airborne Collision Avoidance System
ACC,altocumulus castellanus/air control center
ACCAS,altocumulus castellanus
ACCUM,accumulate
ACFT,aircraft
ACK,acknowledge
ACL,altimeter check location
ACLD,above clouds
ACLT,accelerate
ACN,aircraft classification number
ACPT,accept
ACR,air carrier
ACRBT,acrobatic
ACRS,across
ACSL,standing lenticular altocumulus
ACT,active/activated/activity
ACTG,acting
ACTV,active
ACTVT,activate
ACTVTD,activated
ACYC,anticyclonic
AD,aerodrome
ADA,advisory area
ADDN,addition
ADF,Automatic Direction Finder
ADIZ,Air Defense Identification Zone
ADJ,adjacent
ADQT,adequate
ADR,Advisory Route
ADRNDCK,adirondack
ADV,advise
ADVCTN,advection
ADVN,advance
ADVY,advisory
ADVZD,advized
ADVZY,advisory
ADZD,advized
AEIS,Aeronautical Enroute Information Service
AER,approach end runway
AERADIO,air radio
AERO,aerodrome
AFB,Air Force Base
AFC,area forecast center
AFCT,affect
AFD,Airport/Facility Directory
AFDK,after dark
AFIS,Airport Flight Information Service
AFN,American Forces Network
AFRS,Armed Forces Radio Stations
AFSS,Automated Flight Service Station
AFT,after
AFTN,afternoon
AGL,above ground level
AH,alert height
AHD,ahead
AIM,Aeronautical Information Manual
AIREPS,aircraft reports
AIRMET,Airmen's Meteorological Information
ALA,authorized landing area
ALF,aloft/auxiliary landing field
ALG,along
ALGHNY,Allegheny
ALNMT,alignment
ALP,aircraft location point
ALQDS,all quadrants
ALQS,all quadrants
ALS,Approach Light System
ALSEC,all sectors
ALSF-1,standard 2400' high-intensity approach lighting system with sequenced flashers (Category I configuration)
ALSF-2,standard 2400' high-intensity approach lighting system with sequenced flashers (Category II configuration)
ALSTG,altimeter setting
ALT,altitude
ALTA,Alberta
ALTM,altimeter
ALTN,alternate
ALTNLY,alternately
ALUTN,Aleutian
ALWF,actual wind factor
AM,ante meridiem
AMA,Area Minimum Altitude
AMB,amber
AMD,amended
AMDT,amendment
AMGR,airport manager
AMOS,Automatic Meteorological Observing System
AMS,air mass
AMSL,above mean sea level
ANAPROP,anomalous propagation
ANCPT,anticipate
AND,and
ANGB,Air National Guard Base
ANLYS,analysis
AO1,station without a precipitation discriminator
AO2,station with a precipitation discriminator
AOA,at or above
AOB,at or below
AOE,airport of entry
AP LGT,airport lights
AP,airport
APAPI,Abbreviated Precision Approach Path Indicator
APC,Area Positive Control
APCH,approach
APL,airport lights
APLCN,Appalachian
APN,Apron
APP,Approach Control
APRNT,apparent
APROP,appropriate
APRX,approximately
APT,airport
ARB,Air Reserve Base
ARFF,Aircraft Rescue & Fire Fighting
ARFOR,area forecast
ARINC,Aeronautical Radio, Inc.
ARND,around
ARO,Airport Reporting Officer
ARPT,airport
ARR,arrival
ARTC,Air Route Traffic Control
ARTCC,Air Route Traffic Control Center
AS,altostratus
ASAP,as soon as possible
ASDA,accelerate-stop distance available
ASDAR,aircraft to satellite data relay
ASL,above sea level
ASOS,Automated Surface Observing System
ASPH,asphalt
ASR,Airport Surveillance Radar
ASSOCD,associated
ATA,actual time of arrival
ATC,Air Traffic Control
ATCAA,Air Traffic Control Assigned Airspace
ATCC,Air Traffic Control Center
ATCSCC,Air Traffic Control System Command Center
ATCT,Air Traffic Control Tower
ATD,actual time of departure
ATF,airport traffic frequency
ATFM,air traffic flow management
ATIS,Automatic Terminal Information Service
ATLC,Atlantic
ATS,Air Traffic Service
ATZ,airport traffic zone
AURBO,Aurora Borealis
AUTH,authorized
AUTO,automated report
AUW,all-up weight
AUX,auxiliary
AVBL,available
AVG,average
AVGAS,aviation gasoline
AWIB,Airport Weather Information Broadcast
AWOS,Automatic Weather Observing System
AWP,aviation weather processors
AWS,automatic weather station
AWY,airway
AZM,azimuth
B,began
BA,braking action
BACLIN,Baroclinic
BAJA,Baja California
BATROP,Barotropic
BC,British Columbia
BCH,beach
BCKG,backing
BCM,become
BCMG,becoming
BCMS,becomes
BCOB,broken clouds or better
BCST,broadcast
BD,blowing dust
BDA,Bermuda
BDRY,boundary
BECMG,becoming
BERM,snowbank(s) containing earth/gravel
BFDK,before dark
BFR,before
BGN,begin
BGNG,beginning
BGNS,begins
BHND,behind
BINOVC,breaks in overcast
BKN,broken
BL,between layers
BLD,build
BLDG,building
BLDS,builds
BLDUP,buildup
BLKHLS,Black Hills
BLKT,blanket
BLKTG,blanketing
BLKTS,blankets
BLO,below
BLU,blue
BLW,below
BLZD,blizzard
BM,back marker
BMS,basic meteorological services
BN,blowing sand
BND,bound
BNDRY,boundary
BNDRYS,boundaries
BNK,bank
BNTH,beneath
BOOTHEEL,Bootheel
BOVC,base of overcast
BR,branch
BRF,brief
BRG,branching/bearing
BRK,break
BRKG,breaking
BRKHIC,breaks in higher clouds
BRKS,breaks
BRKSHR,Berkshire
BRKSHRS,Berkshires
BRM,barometer
BRS,branches
BS,blowing snow
BTL,between layers
BTN,between
BTWN,between
BYD,by day/beyond
C,center
CA,California
CAA,cold air advection
CAAS,Class A Airspace
CADIS,Canadian Air Defense Identification Zone
CAN,Canada
CARIB,Caribbean
CARS,Community Airport Radio Station
CASCDS,Cascades
CAT,clear air turbulence/category
CAVOK,ceiling and visibility OK
CAVU,ceiling and visibility unlimited
CAWS,common aviation weather sub-system
CB,cumulonimbus cloud
CBAS,Class B Airspace
CBMAM,cumulonimbus mammatus cloud
CBS,cumulonimbi
CBSA,Class B Surface Area
CC,cirrocumulus cloud
CCAS,Class C Airspace
CCLDS,clear of clouds
CCLKWS,counter-clockwise
CCSA,Class C Surface Area
CCSL,cirrocumulus standing lenticular cloud
CD,Clearance Delivery
CDAS,Class D Airspace
CDFNT,cold front
CDFNTL,cold frontal
CDI,Course Deviation Indicator
CDSA,Class D Surface Area
CDT,Central Daylight Time
CEAS,Class E Airspace
CEIL,ceiling
CESA,Class E Surface Area
CFP,cold front passage
CFR,Code of Federal Regulations
CG,cloud-to-ground
CGAS,Class G Airspace
CGL,Circling Guidance Lights
CH,channel/critical height
CHAN,channel
CHARC,characteristic
CHC,chance
CHCS,chances
CHG,change
CHGD,changed
CHGG,changing
CHGS,changes
CHI,cloud-height indicator
CHINO,sky condition at secondary location not available
CHSPK,Chesapeake
CI,cirrus
CIG,ceiling
CIGS,ceilings
CK,check
CL,centerline
CLD,cloud
CLDNS,cloudiness
CLDS,clouds
CLKWS,clockwise
CLR,clear sky/clearance/clear(s)/cleared to
CLRG,clearing
CLRS,clears
CLSD,closed
CMB,climb
CMNPS,Canadian Minimum Navigation Performance Specification
CMPLX,complex
CMSND,commissioned
CNCL,cancel
CNCLD,cancelled
CNCLG,cancelling
CNCLS,cancels
CNDN,Canadian
CNF,Computer Navigation Fix
CNFDC,confidence
CNL,cancel
CNTR,center
CNTRD,centered
CNTRL,central
CNTRLN,centerline
CNTRS,Centers
CNTY,County
CNTYS,Counties
CNVG,converge
CNVGG,converging
CNVGNC,convergence
CNVTN,convection
CNVTV,convective
CNVTVLY,convectively
CO,Colorado/county
COM,communications
COMLO,Compass Locator
COMM,communications
COMPAR,compare
COMPARD,compared
COMPARG,comparing
COMPARS,compares
CONC,concrete
COND,conditions
CONDS,conditions
CONFDC,confidence
CONS,constant/continuous
CONT,continue/countinuous
CONTD,continued
CONTDVD,Continental Divide
CONTG,continuing
CONTLY,continually
CONTRAILS,Condensation Trails
CONTS,continues
CONUS,Continental U.S.
COORD,coordinate(s)
COP,Change Over Point
COR,correction to a previously disseminated observation
CORR,corridor
CP,Command Post
CPBL,capable
CPD,coupled
CPT,Clearance-Pre-Taxi Procedure
CRC,circle
CRCLC,circulate
CRCLN,circulation
CRNR,corner
CRNRS,corners
CRP,Compulsory Reporting Point
CRS,course
CS,cirrostratus
CSDR,consider
CSDRBL,considerable
CST,coast/Central Standard Time
CSTL,coastal
CT,Connecticut
CTA,Control Area
CTAF,Common Traffic Advisory Frequency
CTC,contact
CTGY,category
CTL,control
CTR,control zone
CTSKLS,Catskills
CU,cumulus
CUCON,cumulus congestus cloud
CUFRA,cumulus fractus
CUHU,cumulus humilis cloud
CUMED,cumulus medicoris cloud
CVFR,Controlled VFR
CVR,cover
CVRD,covered
CVRG,covering
CVRS,covers
CYC,cyclonic
CYCLGN,cyclogenesis
D-ATIS,digital ATIS
DA,decision altitude
DABRK,daybreak
DALGT,day light
DALR,dry adiabatic lapse rate
DATA,data
DBL,double
DC,District of Columbia
DCAVU,ceiling and visibility unlimited, remainder of report missing
DCR,decrease
DCRD,decreased
DCRG,decreasing
DCRGLY,decreasingly
DCRS,decreases
DCT,direct
DE,Delaware
DECMSND,decommissioned
DEG,degree
DEGS,degrees
DELMARVA,Delaware-Maryland-Virginia
DEP,departure
DEPTH,depth
DER,departure end of runway
DEWIZ,Distance Early Warning Identification Zone
DFCLT,difficult
DFCLTY,difficulty
DFNT,definite
DFNTLY,definitely
DFRS,differs
DFUS,diffuse
DGNL,diagonal
DGNLLY,diagonally
DH,decision height
DIGG,digging
DIR,direction
DISABLD,disabled
DISC,discontinue
DISCD,discontinued
DISCG,discontinuing
DISPL,displaced
DISRE,disregard
DISRED,disregarded
DISREG,disregarding
DIST,distance
DKTS,Dakotas
DLA,delay
DLAD,delayed
DLT,delete
DLTD,deleted
DLTG,deleting
DLY,daily
DME,Distance-Measuring Equipment
DMG,damage
DMGD,damaged
DMGG,damaging
DMNT,dominant
DMSH,diminish
DMSHD,diminished
DMSHG,diminishing
DMSHS,diminishes
DMSTN,demonstration
DNDFTS,downdrafts
DNS,dense
DNSLP,downslope
DNSTRM,downstream
DNWND,down wind
DOC,Department of Commerce
DOD,Department of Defense
DOM,domestic
DOT,Department of Transportation
DP,deep
DPND,deepened
DPNG,deepening
DPNS,deepens
DPR,deeper
DPTH,depth
DRFT,drift/snowbank(s) caused by wind action
DRFTD,drifted
DRFTG,drifting
DRFTS,drifts
DRY,dry
DRZL,drizzle
DSCNT,descent
DSIPT,dissipate
DSIPTD,dissipated
DSIPTG,dissipating
DSIPTN,dissipation
DSIPTS,dissipates
DSND,descend
DSNDG,descending
DSNDS,descends
DSNT,distant
DSPLCD,displaced
DSPTD,dissipated
DSTBLZ,destabilize
DSTBLZD,destabilized
DSTBLZG,destablizing
DSTBLZN,destablization
DSTBLZS,destablizes
DSTC,distance
DTLN,International Dateline
DTRT,deteriorate
DTRTD,deteriorated
DTRTG,deteriorating
DTRTS,deteriorates
DURC,during climb
DURD,during decent
DURG,during
DURN,duration
DVLP,develop
DVLPD,developed
DVLPG,developing
DVLPMT,development
DVLPS,develops
DVR,dispatch visual range
DVRG,diverge
DVRGG,diverging
DVRGNC,divergence
DVRGS,diverges
DVV,downward vertical velocity
DWNDFTS,downdrafts
DWPNT,dewpoint
DWPNTS,dewpoints
DX,duplex
E,east
EAT,Expected Approach Time
EBND,east bound
ECMWF,European Centre for Medium Range Weather Forecasts
EDT,Eastern Daylight Time
EET,Estimated Elapsed Time
EFAS,En-route Flight Advisory Service
EFCT,effect
EFF,effective
ELEV,elevation
ELNGT,elongate
ELNGTD,elongated
ELR,environmental lapse rate
ELSW,elsewhere
EMBD,embedded
EMBDD,embedded
EMERG,emergency
EMSU,environment meteorological support unit
ENCTR,encounter
ENDG,ending
ENE,east-northeast
ENELY,east-northeasterly
ENERN,east-northeastern
ENEWD,east-northeastward
ENG,engine
ENHNC,enhance
ENHNCD,enhanced
ENHNCG,enhancing
ENHNCMNT,enhancement
ENHNCS,enhances
ENRT,en-route
ENTR,entire
EOBT,Estimated Off-Block Time
EOF,expected operations forecast
ERN,eastern
ERY,early
ERYR,earlier
ESE,east-southeast
ESELY,east-southeasterly
ESERN,east-southeastern
ESEWD,east-southeastward
ESNTL,essential
EST,Eastern Standard Time
ESTAB,establish
ESTIMATE,estimate
ESTMD,estimated
ESTS,estimates
ETA,Estimated Time of Arrival
ETC,et cetera
ETD,Estimated Time of Departure
ETE,Estimated Time En-route
ETIM,elapsed time
ETOPS,Extended Range Operations
EUMETSTAT,European Meteorological Satellite
EVE,evening
EWD,eastward
EXC,except
EXCLV,exclusive
EXCLVLY,exclusively
EXCP,except
EXPC,expect
EXPCD,expected
EXPCG,expecting
EXTD,extend
EXTDD,extended
EXTDG,extending
EXTDS,extends
EXTN,extension
EXTRAP,extrapolate
EXTRAPD,extrapolated
EXTRM,extreme
EXTRMLY,extremely
EXTSV,extensive
F,Farenheit
FA,aviation area forecast
FAA,Federal Aviation Administration
FAC,facility/facilities
FAF,Final Approach Fix
FAH,Farenheit
FAM,familiar
FAP,Final Approach Point
FAR,Federal Aviation Regulation
FCP,Final Control Point
FCST,forecast
FCSTD,forecasted
FCSTG,forecasting
FCSTR,forecaster
FCSTS,forecasts
FDC,Flight Data Center
FEW,few
FI/P,Flight Inspection Permanent
FI/T,Flight Inspection Temporary
FIBI,filed but impracticable to transmit
FIC,Flight Information Center
FIG,figure
FILG,filling
FINO,weather report will not be filed for transmission
FIR,Flight Information Region
FIRAV,first available
FIRST,first observation after a break in coverage at manual station
FIS,Flight Information Service
FL,Florida/flight level
FLD,field/flood
FLDST,flood stage
FLG,falling/flashing
FLOP,floating-point operation
FLOPS,floating-point operations
FLRY,flurry
FLRYS,flurries
FLT,flight
FLW,follow
FLWG,following
FLWIS,flood warning issued
FM,from
FMH-1,Federal Meteorological Handbook No.1, Surface Weather Observations & Reports (METAR)
FMH2,Federal Meteorological Handbook No.2, Surface Synoptic Codes
FMS,Flight Management System
FMT,format
FNA,final approach
FNCTN,function
FNT,front
FNTGNS,frontogenesis
FNTL,frontal
FNTLYS,frontolysis
FNTS,fronts
FORNN,forenoon
FPM,feet per minute
FPS,feet per second
FQT,frequent
FQTLY,frequently
FREQ,frequency
FRH,fly runway heading
FRI,friday
FRM,form
FRMG,forming
FRMN,formation
FROIN,Frost On The Indicator
FROPA,frontal passage
FROSFC,frontal surface
FRQ,frequent
FRST,frost
FRWF,forecast wind factor
FRZ,freeze
FRZG,freezing
FRZLVL,freezing level
FRZN,frozen
FSS,Flight Service Station
FT,feet
FTHR,further
FTS,Flexible Track System
FULYR,smoke layer aloft
FUOCTY,smoke over city
FVRBL,favorable
FWC,fleet weather central
FWD,forward
FYI,for your information
FZRANO,freezing rain sensor not available
G,gust
G/S,ground speed
GA,Georgia/general aviation
GARP,Global Atmospheric Research Programme
GC,Ground Control
GCA,Ground Controlled Approach
GCM,Global Computer Model
GCO,Ground Communication Outlet
GEN,general
GENLY,generally
GEO,geographic
GEOREF,geographical reference
GEOS,geostationary satellite
GF,ground fog
GICG,glaze icing
GLFALSK,Gulf of Alaska
GLFCAL,Gulf of California
GLFMEX,Gulf of Mexico
GLFSTLAWR,Gulf of St. Lawrence
GLONASS,Global Orbiting Navigation Satellite System
GMT,Grenwich Mean Time
GND,ground
GNDFG,ground fog
GNSS,Global Navigation Satellite System
GOVT,government
GP,glidepath
GPS,Global Positioning System
GRAD,gradient
GRBNKS,Grand Banks
GRDL,gradual
GRDLY,gradually
GRN,green
GRT,great
GRTLKS,Great Lakes
GRTLY,greatly
GRTR,greater
GRTST,greatest
GRVL,gravel
GS,glide slope
GSTS,gusts
GSTY,gusty
GTS,Global Telecommunications System
GV,ground visibility
GWT,gross weight
H24,24 hour service
HAA,height above airport
HAS,height above site
HAT,height above touchdown
HAZ,hazard
HC,critical height
HCVIS,high clouds visible
HDFRZ,hard freeze
HDG,heading
HDSVLY,Hudson Valley
HDWND,head wind
HEL,helicopter
HELI,heliport
HFS,high-friction surface
HGT,height
HI,high
HIALS,High Intensity Approach Light System
HIEAT,highest temperature equaled for all time
HIEFM,highest temperature equaled for the month
HIER,higher
HIESE,highest temperature equaled so early
HIESL,highest temperature equaled so late
HIFOR,high level forecast
HIRL,High Intensity Runway Lights
HITMP,highest temperature
HIWAS,Hazardous Inflight Weather Advisory Service
HIXAT,highest temperature exceeded for all time
HIXFM,highest temperature exceeded for the month
HIXSE,highest temperature exceeded so early
HIXSL,highest temperature exceeded so late
HJ,sunrise-to-sunset
HLDG,holding
HLF,half
HLSTO,hailstone
HLTP,hilltop
HLYR,haze layer aloft
HN,sunset-to-sunrise
HND,hundred
HO,by operational requirements
HOL,holiday
HP,holding pattern
HR,hour
HRS,hours
HRZN,horizon
HS,during hours of scheduled operations
HST,high speed taxiway turn-off
HTG,heating
HURCN,hurricane
HUREP,hurricane report
HV,have
HVY,heavy
HVYR,heavier
HVYST,heaviest
HWVR,however
HWY,highway
HX,high index
HZ,hertz
IA,Iowa
IAF,Initial Approach Fix
IAP,Instrument Approach Procedure
IAS,Indicated Airspeed
IBN,Identification Beacon
IC,ice
ICAO,International Civil Aviation Organization
ICG,icing
ICGIC,icing in clouds
ICGICIP,icing in clouds and precipitation
ICGIP,icing in precipitation
ID,Idaho/identification
IDENT,identification
IF,Intermediate Fix
IFR,IFR
IGS,Instrument Guidance System
IL,Illinois
ILS,Instrument Landing System
IM,Inner Marker
IMC,Instrument Meteorological Conditions
IMDT,immediate
IMDTLY,immediately
IMO,International Meteorological Organization (now WMO)
IMPL,impulse
IMPLS,impulses
IMPT,important
IMTA,Intensive Military Training Area
INBD,inbound
INCL,include
INCLD,included
INCLG,including
INCLS,includes
INCR,increase
INCRD,increased
INCRG,increasing
INCRGLY,increasingly
INCRS,increases
INDC,indicate
INDCD,indicated
INDCG,indicating
INDCS,indicates
INDEF,indefinite
INDEFLY,indefinitely
INFO,information
INLD,inland
INOP,inoperative
INS,Inertial Navigation System
INSAT,Indian Satellite
INSTBY,instability
INSTR,instrument
INT,intersection
INTCNTL,intercontinental
INTL,international
INTMD,intermediate
INTMT,intermittent
INTMTLY,intermittently
INTO,into
INTR,interior
INTRMTRGN,intermountain region
INTS,intense
INTSFCN,intensification
INTSFY,intensify
INTSFYD,intensified
INTSFYG,intensifying
INTSFYS,intensifies
INTSTY,intensity
INTVL,interval
INVOF,in vicinity of
INVRN,inversion
IOVC,in overcast
IP,ice pellets
IPV,improve
IPVG,improving
IR,ice on runway(s)
IS,islands
ISOL,isolated
ISOLD,isolated
ITCZ,Inter-Tropical Convergence Zone
ITWS,Integrated Terminal Weather System
JAA,JOint Aviation Authorities
JCTN,junction
JTSTR,jetstream
KFRST,killing frost
KGS,kilograms
KHZ,kilohertz
KIAS,knots indicated airspeed
KLYR,smoke layer aloft
KM,kilometers
KMH,kilometers per hour
KOCTY,smoke over city
KS,Kansas
KT,knots
KTAS,knots true airspeed
KY,Kentucky
L,left
LA,Louisiana
LAA,Local Airport Advisory
LABRDR,Labrador
LACFT,large aircraft
LAHSO,land and hold short operations
LAM,Limited Area model
LAST,last observation before a break in coverage at a manual station
LAT,latitude
LAWRS,Limited Aviation Weather Reporting Station
LB,pound(s)
LBCM,locator back course marker
LBM,locator back marker
LBS,pounds
LC,Local Control
LCG,Load Classification Group
LCL,local
LCLY,locally
LCN,Load Classification Number
LCTD,located
LCTMP,little change in temperature
LCTN,location
LCTR,locator
LDG,landing
LDI,Landing Direction Indicator
LDIN,Lead-in Light System
LEVEL,level
LFM,Limited Fine Mesh Model
LFT,lift
LFTG,lifting
LGRNG,long range
LGT,light
LGTH,length
LGTR,lighter
LGWV,long wave
LI,Lifted Index
LIFR,low IFR
LIM,Locator Inner Marker
LIRL,Low Intensity Runway Lights
LIS,lifted indices
LK,lake
LKLY,likely
LKS,lakes
LLJ,low level jet
LLWAS,Low Level Wind Shear Alert System
LLWS,low level wind shear
LMM,Locator Middle Marker
LMTD,limited
LMTG,limiting
LMTS,limits
LN,line
LNDG,landing
LO,low
LOC,localizer
LOEAT,lowest temperature equaled for all tiem
LOEFM,lowest temperature equaled for the month
LOESE,lowest temperature equaled so early
LOESL,lowest temperature equaled so late
LOM,Locator Outer Marker
LONG,longitude
LONGL,longitudnal
LORAN,Long Range Navigation
LOTMP,lowest temperature
LOXAT,lowest temperature for all time
LOXFM,lowest temperature for the month
LOXSE,lowest temperature so early
LOXSL,lowest temperature so late
LRG,large
LRGLY,largely
LRGR,larger
LRGST,largest
LSALT,lowest safe altitude
LSR,loose snow on runway(s)
LST,Local Standard Time
LTD,limited
LTG,lightning
LTGCA,lightning cloud-to-air
LTGCC,lightning cloud-to-cloud
LTGCCCG,lightning cloud-to-cloud cloud-to-ground
LTGCG,lightning cloud-to-ground
LTGCW,lightning cloud-to-water
LTGIC,lightning in cloud
LTL,little
LTLCG,little change
LTNG,lightning
LTR,later
LTS,lights
LTST,latest
LV,leaving
LVL,level
LVLS,levels
LWR,lower
LWRD,lowered
LWRG,lowering
LX,low index
LYR,layer
LYRD,layered
LYRS,layers
M,meters
MA,Massachusetts
MAA,Maximum Authorized Altitude
MAG,magnetic
MAINT,maintain/maintenance
MALS,med intensity approach light system
MALSF,medium intensity approach light system with sequenced flashing lights
MALSR,medium intensity approach light system with runway alignment indicator lights
MAN,Manitoba
MAP,missed approach point
MAPT,missed approach point
MAX,maximum
MB,millibars
MBZ,mandatory broadcast zone
MCA,minimum crossing altitude
MCAF,marine corps air facility
MCD,Mesoscale discussion
MCTA,military controlled airpsace
MD,Maryland
MDA,minimum descent altitude
MDFY,modify
MDFYD,modified
MDFYG,modifying
MDL,model
MDLS,models
MDT,moderate
MDTLY,moderately
ME,Maine
MEA,minimum enroute altitude
MED,medium
MEDIUM,medium
MEGG,merging
MEHT,minimum eye height over threshold
MEML,memorial
MESO,Mesoscale
MET,meteorological
METAR,aviation routine weather report
METEOSAT,Meteorological Satellite
METRO,metropolitan
MEX,Mexico
MHA,minimum holding altitude
MHKVLY,Mohawk Valley
MHZ,megahertz
MI,Michigan/medium intensity
MIALS,Medium Intensity Approach Light System
MID,middle
MIDN,midnight
MIL,military
MIM,minimum
MIN,minimum
MIRL,Medium Intensity Runway Lights
MISG,missing
MKR,marker
MLS,Microwave Landing System
MLTLVL,melting level
MM,middle marker
MMO,Main Meteorological Office
MN,Minnesota
MNLD,mainland
MNLND,mainland
MNLY,mainly
MNM,minimum
MNPS,Minimum Navigation Performance Specifications
MNT,monitor/monitoring/monitored
MO,Missouri
MOA,Military Operation Area
MOC,Minimum Obstruction Clearance
MOCA,Minimum Obstruction Clearance Altitude
MOD,moderate
MOGR,moderate or greater
MON,monday
MONTR,monitor
MORA,minimu off route altitude
MOS,Model Output Statistics
MOV,move
MOVD,moved
MOVG,moving
MOVMT,movement
MOVS,moves
MPH,miles per hour
MPS,meters per second
MRA,minimum reception altitude
MRF,medium range forecast
MRGL,marginal
MRGLLY,marginally
MRNG,morning
MRTM,maritime
MS,Mississippi/minus
MSA,minimum safe altitude
MSAW,minimum safe altitude warning
MSG,message
MSHP,mishap
MSL,mean sea level
MSLP,mean sea level pressure
MST,most
MST,mountain standard time
MSTLY,mostly
MSTR,moisture
MT,mountains
MTA,Military Train Area
MTAF,Mandatory Traffic Advisory Frequency
MTCA,Minimum Terrain Clearance Altitude
MTMA,Military Terminal Control Area
MTN,mountain
MTNS,mountains
MTOW,Maximum Take Off Weight
MTW,mountain waves
MUD,mud
MULT,multiple
MULTILVL,multi-level
MUN,municipal
MUNI,municipal
MVA,Minimum Vectoring Altitude
MVFR,Marginal VFR
MX,mixed
MXD,mixed
N,north
N/A,not applicable
NA,not authorized
NAAS,Naval Auxiliary Air Station
NAB,not above
NAR,North American Routes
NAS,Naval Air Station
NAT,North Atlantic Traffic
NAT/OTS,North Atlantic Traffic/Organized Track System
NATL,national
NAV,navigation
NAVAID,navigational aid
NB,New Brunswick/northbound
NBND,northbound
NBRHD,neighborhood
NC,North Carolina
NCA,northern control area
NCD,clear sky
NCDC,National Climatic Data Center
NCRP,non compulsory reporting point
NCWX,no change in weather
ND,North Dakota
NDB,Non-Directional Beacon
NE,northeast
NEB,Nebraska
NEC,necessary
NEG,negative
NEGLY,negatively
NELY,northeasterly
NERN,northeastern
NEW ENG,New England
NEWD,northeastward
NFLD,Newfoundland
NGM,Nested Grid Model
NGT,night
NH,New Hampshire
NIL,none
NJ,New Jersey
NL,no layers
NLC,noctilucent cloud
NLT,not later than
NLY,northerly
NM,New Mexico
NMBR,number
NMBRS,numbers
NMC,National Meteorological Center
NML,normal
NMR,nautical mile radius
NMRS,numerous
NNE,north-northeast
NNELY,north-northeasterly
NNERN,north-northeastern
NNEWD,north-northeastward
NNNN,end of message
NNW,north-northwest
NNWLY,north-northwesterly
NNWRN,north-northwestern
NNWWD,north-northwestward
NO,no
NOAA,National Oceanic and Atmospheric Administration
NOGAPS,National Oceanographic Global Atmospheric Prediction System
NONSTD,nonstandard
NOPAC,Northern Pacific
NOPT,no procedure turn
NORPI,no pilot balloon observation will be filed
NOS,National Ocean Survey
NOSIG,no significant change is expected in next 2 hours
NOSPECI,no SPECI reports are taken at the station
NOSPL,no special observations taken
NOTAM,Notice to Airmen
NPRS,nonpersistent
NR,number/near
NRLY,nearly
NRN,northern
NRW,narrow
NS,Nova Scotia/nimbostratus
NSC,clear sky
NSCSWD,no small craft or storm warning are being displayed
NSW,no significant weather
NTAP,notice to airmen publication
NTFY,notify
NTFYD,notified
NV,Nevada
NVA,negative vorticity advection
NW,northwest
NWC,Naval Weapons Center
NWD,northward
NWLY,northwesterly
NWRN,northwestern
NWS,National Weather Service
NXT,next
NY,New York
O/A,on or about
O/R,on request
O/T,other times
OAC,oceanic area control
OAT,outside air temperature
OBND,outbound
OBS,observed
OBSC,obscured/obscure/obscuring
OBSCD,obscured
OBSCG,obscuring
OBST,obstruction/obstacle
OCA,Obstacle Clearance Altitude/Oceanic Control Area
OCFNT,occluded front
OCL,Obstruction Clearance Limit
OCLD,occlude
OCLDD,occluded
OCLDG,occluding
OCLDS,occludes
OCLN,occlusion
OCNL,occasional
OCNLY,occasionally
OCR,occur
OCRD,occurred
OCRG,occurring
OCRS,occurs
OCTA,Oceanic Control Area
ODALS,Omni-Directional Approach Light System
OFC,office
OFCM,Office of the Federal Coordinator for Meteorology
OFP,occluded frontal passage
OFSHR,offshore
OH,Ohio
OHD,overhead
OK,Oklahoma
OM,outer marker
OMNTS,over mountains
OMTNS,over mountains
ONSHR,on shore
ONT,Ontario
OPEN,open
OPNS,operations
OPR,operate, operator or operative
OPS,operations
OR,Oregon
ORGPHC,Orographic
ORIG,original
OSV,ocean station vessel
OTAS,on top and smooth
OTLK,outlook
OTP,on top
OTR,oceanic transitions routes
OTR,other
OTRW,otherwise
OTS,out of service
OUTFLO,outflow
OVC,overcast
OVHD,overhead
OVNGT,overnight
OVR,over
OVRN,overrun
OVRNG,overrunning
OVTK,overtake
OVTKG,overtaking
OVTKS,overtakes
P,more than
P6SM,visibility greater than 6 statute miles
PA,Pennsylvania
PAC,Pacific
PAEW,personnel and equipment working
PAPI,Precision Approach Path Indicator
PAR,Precision Approach Radar
PARL,parallel
PASS,pass
PAT,pattern
PAX,passenger(s)
PBL,planetary boundary layer/probable
PCL,pilot controlled light
PCN,pavement classification number
PCPN,precipitation
PCZ,positive control zone
PD,period
PDC,pre departure clearance
PDMT,predominant/predominate
PDS,periods
PDT,Pacific Daylight Time
PDW,priority delayed weather
PEN,peninsula
PERM,permanent
PGTSND,Puget Sound
PHYS,physical
PIBAL,pilot balloon observation
PIBALS,pilot balloon reports
PIREP,pilot weather report
PIREPS,pilot weather reports
PISE,no pilot balloon observation due to unfavorable sea conditions
PISO,no pilot balloon observations due to snow
PISTON,piston aircraft
PIWI,no pilot balloon observations due to high, or gusty, surface wind
PJE,parachute jumping exercise
PK WND,peak wind
PK,peak
PLA,practice low approach
PLASI,pulsating visual approach slope indicator
PLNS,plains
PLS,please
PLTO,plateau
PLW,plow/plowed
PM,post meridian
PN,prior notice required
PNHDL,pandhandle
PNO,precipitation amount not available
POS,positive
POSLY,positively
PPI,Plan Position Indicator
PPINA,radar weather reports not available
PPINE,radar weather report no echoes observed
PPINO,radar weather report equipment inoperative due to breakdown
PPIOK,radar weather report equipment operation resumed
PPIOM,radar weather report equipment inoperative due to maintenance
PPO,prior permission only
PPR,prior permission required
PPSN,present position
PRA,precision radar approach
PRBL,probable
PRBLTY,probability
PRBLY,probably
PRECD,precede
PRECDD,preceded
PRECDG,preceding
PRECDS,precedes
PRES,pressure
PRESFR,pressure falling rapidly
PRESRR,pressure rising rapidly
PRIM,primary
PRIN,principal
PRIND,present indications are
PRJMP,pressure jump
PRM,precision radar monitor
PRN,psuedo random noise
PROB,probability
PROC,procedure
PROCS,procedures
PROD,produce
PRODG,producing
PROG,forecast/prognosis/prognostic
PROGD,forecasted
PROGS,forecasts
PROP,propeller aircraft
PRSNT,present
PRSNTLY,presently
PRST,persist
PRSTNC,persistence
PRSTNT,persistent
PRSTS,persists
PRVD,provide
PRVDD,provided
PRVDG,providing
PRVDS,provides
PS,plus
PSBL,possible
PSBLTY,possiblity
PSBLY,possibly
PSG,passage/passing
PSN,position
PSND,positioned
PSP,pacific standard time
PSP,pierced steel planking
PSR,packed snow on runway(s)
PTCHY,patchy
PTLY,partly
PTN,procedure turn
PTNL,potential
PTNLY,potentially
PTNS,portions
PUGET,Puget Sound
PVA,positive vorticity advection
PVL,prevail
PVLD,prevailed
PVLG,prevailing
PVLS,prevails
PVLT,prevalent
PVT,private operator or private
PWINO,precipitation identifier sensor not available
PWR,power
QBO,quasi-biennial oscillation
QDM,magnetic bearing to facility
QDR,manetci bearing from facility
QFE,height above airport elevation
QN,question
QPFERD,NMC excessive rainfall discussion
QPFHSD,NMC heavy snow discussion
QPFSPD,NMC special precipitation discussion
QSTNRY,quasistationary
QTR,quarter
QUAD,quadrant
QUE,Quebec
R,right
RA,radio altimeter
RABA,no RAWIN observation (no balloons available)
RABAL,radiosonde balloon wind data
RABAR,radiosonde balloon release
RACO,no RAWIN observation (communications out)
RADAT,radiosonde observation data
RADNO,report missing account radio failure
RAFI,radiosonde observation not filed
RAFRZ,radiosonde observation freezing levels
RAHE,no RAWIN observation (no gas available)
RAI,runway alignment indicator
RAICG,radiosonde observation icing at
RAIL,runway alignment indicator lights
RAMOS,remote automatic meterological observing system
RAOB,radiosonde observation
RAOBS,radiosonde observations
RAPCON,radar approach control
RAPI,radiosonde report already sent in PIBAL collection
RAREP,radar weather report
RAVU,radiosonde analysis and verification unit
RAWE,no RAWIN observation (unfavorable weather)
RAWI,no RAWIN observation (high and gusty winds)
RAWIN,upper winds observation
RCAG,remote communications air ground
RCC,rescue coordination center
RCD,radar cloud detection report
RCDNA,radar cloud detection report not available
RCDNE,radar cloud detection report no echoes observed
RCDNO,radar cloud detector inoperative due to breakdown until
RCDOM,radar cloud detector inoperative due to maintenance until
RCH,reach
RCHD,reached
RCHG,reaching
RCHS,reaches
RCKY,Rocky
RCKYS,Rockies
RCL,runway centerline
RCLL,runway centerline light system
RCLM,runway center line markings
RCMD,recommend
RCMDD,recommended
RCMDG,recommending
RCMDS,recommends
RCO,remote communications outlet
RCRD,record
RCRDS,records
RCRNR,base operations closed
RCV,receive
RCVD,received
RCVG,receiving
RCVS,receives
RDC,reduce
RDG,ridge
RDGG,ridging
RDR,radar
RDVLP,redevelop
RDVLPG,redeveloping
RDVLPMT,redevelopment
RDWND,radar dome wind
RE,regard
REC,receive/receiver
RECON,reconnaissance
RED,red
REF,reference
REIL,runway end identifier lights
RELC,relocated
RENL,runway end identifier lights
REP,ram entrance point
REP,reporting point
REPL,replace
REPLD,replaced
REPLG,replacing
REPLS,replaces
REQ,request
REQS,requests
REQSTD,requested
RES,reserve
RESP,response
RESTR,restrict
RGD,ragged
RGL,Regional Model
RGLR,regular
RGN,region
RGNS,regions
RGT,right
RH,relative humidity
RHI,Range Height Indicator
RHINO,RHI not operative
RI,Rhode Island
RIOGD,Rio Grande
RL,runway light
RLBL,reliable
RLLS,runway lead-in lights system
RLTV,relative
RLTVLY,relativily
RMK,remark
RMN,remain
RMND,remained
RMNDR,remainder
RMNG,remaining
RMNS,remains
RNAV,area navigation
RNFL,rainfall
RNP,required navigation performance
ROBEPS,radar operating below prescribed standard
ROC,rate of climb
ROT,rotate
ROTD,rotated
ROTG,rotating
ROTOR,rotor
ROTS,rotates
RPD,rapid
RPDLY,rapidly
RPLC,replace
RPLCD,replaced
RPLCG,replacing
RPLCS,replaces
RPRT,report
RPRTD,reported
RPRTG,reporting
RPRTS,reports
RPT,regular public transport
RPT,repeat
RPTG,repeating
RPTS,repeats
RQR,require
RQRD,required
RQRG,requiring
RQRS,requires
RRL,runway remaining lights
RS,receiver station
RSG,rising
RSN,reason
RSNG,reasoning
RSNS,reasons
RSR,en route surveillance radar
RSTR,restrict
RSTRD,restricted
RSTRG,restricting
RSTRS,restricts
RSVN,reservation
RT,right turn
RTD,Routine Delayed (late) observation
RTE,route
RTR,remote transmitter/receiver
RTRN,return
RTRND,returned
RTRNG,returning
RTRNS,returns
RTS,return to service
RUF,rough
RUFLY,roughly
RV,reportable value
RVR,runway visual range
RVRM,runway visual range midpoint
RVRNO,RVR system values not available
RVRR,runway visual range rollout
RVRT,runway visual range touchdown
RVS,revise
RVSD,revised
RVSG,revising
RVSM,reduced vertical separation minimum
RVSS,revises
RVV,runway visbility values
RW,rain shower
RWY,runway
RY,runway
S,south
SA,sand, sanded
SA,surface observation
SALR,saturated adiabatic lapse rate
SALS,short approach light system
SALSF,short approach light wystem with sequeced flashing lights
SAO,surface observation
SAOS,surface observations
SAR,search and rescue
SASK,Saskatchewan
SAT,saturday
SATCPM,satellite voice air ground calling
SATFY,satisfactory
SAWRS,supplemantary aviation weather reporting station
SB,southbound
SBB,single sideband
SBND,south bound
SBSD,subside
SBSDD,subsided
SBSDNC,subsidence
SBSDS,subsides
SC,South Carolina/stratocumulus
SCA,southern control area
SCND,second
SCNDRY,secondary
SCOB,scattered clouds or better
SCSL,stratocumulus standing lenticular cloud
SCT,scattered
SCTD,scattered
SCTR,sector
SD,South Dakota
SDF,simplified directional facility
SE,southeast
SEC,second
SEC,seconds
SELCAL,selective call system
SELS,severe local storms
SELY,southeasterly
SEPN,separation
SEQ,sequence
SERN,southeastern
SEV,severe
SEWD,southeastward
SF,sferic (radio interference caused by lightning strikes)
SFC,surface
SFERICS,Atmospherics
SFL,sequenced flashing lights
SFLOC,sferic location
SG,snow grains
SGD,solar-geophysical data
SGFNT,significant
SGFNTLY,significantly
SHFT,shift
SHFTD,shifted
SHFTG,shifting
SHFTS,shifts
SHLD,shield
SHLW,shallow
SHR,shear
SHRT,short
SHRTLY,shortly
SHRTWV,shortwave
SHRTWVS,shortwaves
SHUD,should
SHWR,shower
SHWRS,showers
SID,standard instrument departure
SIERNEV,Sierra Nevada
SIG,signature
SIGMET,significant meteorological information
SIMUL,simultaneous
SIMUL,simultaneous or simultaneously
SIR,packed or compacted snow and ice on runway(s)
SIR,snow and ice on runway(s)
SIWL,single isolated wheel load
SKC,clear sky
SKD,scheduled
SKED,schedule
SKED,scheduled
SLD,solid
SLGT,slight
SLGTLY,slightly
SLO,slow
SLOLY,slowly
SLOR,slower
SLP,sea-level pressure
SLP,speed limiting point
SLPG,sloping
SLPNO,sea-level pressure not available
SLR,slush on runway(s)
SLT,sleet
SLY,southerly
SM,statute mile(s)
SM,statute miles
SMGCS,surface movement guidance and control system
SMK,smoke
SML,small
SMLR,smaller
SMRY,summary
SMS,synchronus meteorological satellite
SMTH,smooth
SMTHR,smoother
SMTHST,smoothest
SMTM,sometime
SMWHT,somewhat
SN,snow
SNBNK,snow bank
SNBNK,snowbank(s) caused by plowing
SND,sand
SNFLK,snow flake
SNGL,single
SNINCR,snow increasing rapidly
SNO,snow
SNOINCR,snow increase
SNOINCRG,snow increasing
SNOW,snow
SNST,sunset
SNW,snow
SNWFL,snowfall
SOC,start of climb
SODALS,simplified omnidirectional approach lighting system
SOG,snow on the ground
SOP,standard operating procedure
SP,snow pellets/station pressure
SPCLY,especially
SPD,speed
SPDS,speeds
SPECI,special report
SPENES,satellite precipitation estimate statement
SPKL,sprinkle
SPKLS,sprinkles
SPLNS,Southern Plains
SPRD,spread
SPRDG,spreading
SPRDS,spreads
SPRL,spiral
SQAL,squall
SQLN,squall line
SR,sunrise
SR-SS,sunrise-to-sunset
SRA,special rules area
SRA,surveillance radar approach
SRE,surveillance radar element
SRN,southern
SRND,surround
SRNDD,surrounded
SRNDG,surrounding
SRNDS,surrounds
SS,sunset
SSALF,simplified short approach light system with sequenced flashing lights
SSALR,simplified short approach light system with runway alignment indicator lights
SSALS,simplified short approach light system
SSE,south-southeast
SSELY,south-southeasterly
SSERN,south-southeastern
SSEWD,south-southeastward
SSR,secondary serveillance radar
SST,sea surface temperature
SSW,south-southwest
SSWLY,south-southwesterly
SSWRN,south-southwestern
SSWWD,south-southwestward
ST,stratus cloud
ST-IN,straight in
STA,straight-in approach
STAGN,stagnation
STAR,standard terminal arrival
STBL,stable
STBLTY,stability
STD,standard
STDY,steady
STFR,stratus fractus
STFRA,stratus fractus
STFRM,stratiform
STG,strong
STGLY,strongly
STGR,stronger
STGST,strongest
STLT,satellite
STM,storm
STMS,storms
STN,station
STNRY,stationary
STNS,stations
STOL,short take off and landing
STR,water on runway(s)
STWS,Storm Tide Warning Service
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
SVC,service
SVG,serving
SVN,satellite vehicle number
SVR,severe
SVRL,several
SW+,heavy snow shower
SW,single wheel landing gear
SW,southwest
SW-,light snow shower
SWD,southward
SWEPT,swept or broom/broomed
SWLG,swelling
SWLY,southwesterly
SWOMCD,SELS Mesoscale Discussion
SWRN,southwestern
SWWD,southwestward
SX,stability index
SXN,section
SXNS,sections
SYNOP,synoptic report
SYNS,synopsis
SYS,system
T,thunder
TA,transition altitude
TAA,terminal arrival area
TACAN,tactical air navigation
TAF,Terminal Aerodrome Forecast
TAR,terminal area surveillance radar
TAS,true air speed
TBJT,turbojet
TCAS,traffic alert and collision avoidance system
TCH,threshold crossing height
TCNTL,transcontinental
TCTA,transcontinental control area
TCU,towering cumulus cloud
TDA,today
TDWR,terminal doppler weather radar
TDZ,lgt     touchdown zone lights
TDZ,touchdown zone
TDZE,thouchdown zone elevation
TEMP,temperature
TEMP,temporary
TEMPO,temporary/temporarily
TERPS,us standard for terminal instrument precedure
TFC,traffic
TFR,temporary flight restriction
TGL,touch and go landings
THD,thunderhead
THDR,thunder
THI,Temperature-Humidity Index
THK,thick
THKNG,thickening
THKNS,thickness
THKR,thicker
THKST,thickest
THLD,threshold
THN,thin
THNG,thinning
THNR,thinner
THNST,thinnest
THR,threshold
THRESH,threshold
THRFTR,thereafter
THRU,through
THRUT,throughout
THSD,thousand
THTN,threaten
THTND,threatened
THTNG,threatening
THTNS,threatens
THU,thursday
TIBA,traffic information broadcast by aircraft
TIL,until
TKOF,takeoff
TL,transition level
TM,traffic management
TMA,terminal control area
TML,terminal
TMN,terminates
TMPA,traffic management program alert
TMPRY,temporary
TMPRYLY,temporarilly
TMW,tomorrow
TN,Tennessee
TNDCY,tendency
TNDCYS,tendencies
TNGT,tonight
TNTV,tentative
TNTVLY,tentatively
TO,to
TODA,take off distance available
TOP,top
TOPS,tops
TORA,take off run available
TOVC,top of overcast
TPG,topping
TRACON,terminal radar approach control
TRANS,alt   transitiion altitude
TRANS,lev   transition level
TRBL,trouble
TRCV,tri color visual approach slope indicator
TRIB,tributary
TRKG,tracking
TRML,terminal
TRMT,terminate
TRMTD,terminated
TRMTG,terminating
TRMTS,terminates
TRNG,training
TRNSP,transport
TRNSPG,transporting
TROF,trough
TROFS,troughs
TROP,tropopause
TRPCD,tropical continental
TRPCL,tropical
TRPLYR,trapping layer
TRRN,terrain
TRSN,transition
TRW+,thunderstorm with heavy rain shower
TRW,thunderstorm
TS+,thunderstorm with heavy snow
TS,thunderstorm with snow
TSFR,transfer
TSFRD,transfered
TSFRG,transfering
TSFRS,transfers
TSHWR,thundershower
TSHWRS,thundershowers
TSNO,thunderstorm information not available
TSNT,transient
TSQLS,thundersqualls
TSTM,thunderstorm
TSTMS,thunderstorms
TSW+,thunderstorm with heavy snow showers
TSW,thunderstorm with snow showers
TUE,tuesday
TURB,turbulence
TURBC,turbulence
TURBT,turbulent
TVOR,terminal vor
TWD,toward
TWDS,towards
TWEB,transcribed weather broadcast
TWI,twilight
TWIP,terminal weather information for pilots
TWR,tower
TWRG,towering
TWY,taxiway
TX,Texas
UA,routine pilot report
UAG,upper atmosphere geophysics
UAV,unmanned air vehicles
UDDF,up and down drafts
UFN,until further notice
UHF,ultra high frequency
UIR,upper flight information region
UKMO,UK Met Office
UN,unable
UNAVBL,unavailable
UNCT'L,uncontrolled
UNEC,unnecessary
UNICOM,aeronautical advisory service
UNKN,unknown
UNL,unlimited
UNLGTD,unlighted
UNMKD,unmarked
UNMNT,unmonitored
UNREL,unreliable
UNRELBL,unreliable
UNRSTD,unrestricted
UNSATFY,unsatisfactory
UNSBL,unseasonable
UNSTBL,unstable
UNSTDY,unsteady
UNSTL,unsettle
UNSTLD,unsettled
UNUSBL,unusable
UPDFTS,updrafts
UPR,upper
UPSLP,upslope
UPSTRM,upstream
URG,urgent
USAF,US Air Force
USB,upper sideband
USBL,usable
USN,US Navy
UT,Utah
UTA,Upper Control Area
UTC,Coordinated Universal Time
UUA,urgent pilot report
UV,ultra-violet
UVV,upward vertical velocity
UVVS,upward vertical velocities
UWNDS,upper winds
V,varying/variable
V/V,vertical velocity
VA,Virginia
VAR,magnetic variation
VARN,variation
VASI,visual approach slope indicator
VC,(in the) vicinity
VCNTY,vicinity
VCOT,VFR conditions on top
VCTR,vector
VDP,visual descent point
VDUC,VAS Data Utilization Center (NSSFC)
VE,visual exempted
VFR,VFR
VFR,visual flight rules
VFY,verify
VFYD,verified
VFYG,verifying
VFYS,verifies
VGSI,visual glide slope indicator
VHA,volcanic hazard area
VHF,very high frequency
VIA,by way of
VICE,instead/versus
VIRGA,virga
VIS,visible/visibility
VIS,visiblility
VISNO,visibility at secondary location not available
VLCTY,velocity
VLCTYS,velocities
VLNT,violent
VLNTLY,violently
VLY,valley
VLYS,valleys
VMC,Visual Meteorological Conditions
VNAP,vertical noise abatement procedures
VNAV,vertical navigation
VOL,volume
VOLMET,meteorological information aircraft in flgiht
VOR,vhf omnidirectional range
VORT,vorticity
VORTAC,vor and tacan co-located
VOT,radiated test sgnal for vor
VPA,vertical path angle
VR,visual range/veer
VRB,variable
VRBL,variable
VRG,veering
VRISL,Vancouver Island, BC
VRS,Veers
VRT MOTN,Vertical Motion
VRY,very
VSB,visible
VSBY,visibility
VSBYDR,visibility decreasing rapidly
VSBYIR,visibility increasing rapidly
VT,Vermont
VV,vertical visibility
W,west
W/O,without
W/P,area navigation
WA,Washington
WAA,Warm Air Advection
WB,westbound
WBND,west bound
WDC-1,world data centers in western europe
WDC-2,world data centers throughout rest of world
WDLY,widely
WDSPRD,widespread
WEA,weather
WED,wednesday
WEF,with effect from or effective from
WFO,Weather Forecast Office
WFOS,Weather Forecast Offices
WFP,warm front passage
WG/AOS,Working Group for Atmospheric Observing Systems
WG/SO,Working Group for Surface Observations
WHT,white
WI,Wisconsin
WI,within
WIBIS,will be issued
WINT,winter
WK,weak
WKDAY,weekday
WKDAYS,monday through friday
WKEND,saturday and sunday
WKEND,weekend
WKN,weaken
WKNG,weakening
WKNS,weakens
WKR,weaker
WKST,weakest
WL,will
WLY,westerly
WMO,World Meteorological Organization
WND,wind
WNDS,winds
WNW,west-northwest
WNWLY,west-northwesterly
WNWRN,west-northwestern
WNWWD,west-northwestward
WO,without
WPLTO,Western Plateau
WPT,waypoint
WR,wet runway
WRM,warm
WRMFNT,warm front
WRMFNTL,warm frontal
WRMG,warming
WRMR,warmer
WRMST,warmest
WRN,western
WRNG,warning
WRNGS,warnings
WRS,worse
WS,wind shear
WSFO,Weather Service Forecast Office
WSFOS,Weather Service Forecast Offices
WSHFT,wind shift
WSHFTS,wind shifts
WSO,Weather Service Office
WSOM,Weather Service Operations Manual
WSOS,Weather Service Offices
WSR,wet snow on runway(s)
WSTCH,Wasatch Range
WSW,west-southwest
WSWLY,west-southwesterly
WSWRN,west-southwestern
WSWWD,west-southwestward
WTR,water
WTRS,waters
WTSPT,waterspout
WTSPTS,waterspouts
WUD,would
WV,West Virginia/wave
WVS,waves
WW,Severe Weather Watch
WWAMKC,Status Report
WWD,westward
WWS,Severe Weather Watches
WX,weather
WXCON,weather reconnaissance flight pilot report
WY,Wyoming
X,on request
XCP,except
XPC,expect
XPCD,expected
XPCG,expecting
XPCS,expects
XPLOS,explosive
XTND,extend
XTNDD,extended
XTNDG,extending
XTRM,extreme
XTRMLY,extremely
Y/S,unservicable
YDA,yesterday
YKN,Yukon
YLO,yellow
YLSTN,Yellowstone
Z,Zulu (i.e. Coordinated Universal Time)
ZI,zonal index/zone of interior
ZL,freezing drizzle
ZN,zone
ZNS,zones
ZR,freezing rain
ZRNO,freezing rain information not available
