1 $,maintenance check indicator
2 A01,station without a precipitation discriminator
3 A02,station with a precipitation discriminator
5 AAL,above aerodrome level
13 ACARS,aircraft communication addressing & reporting system
14 ACC,altocumulus castellanus
18 ACL,altimeter check location
25 ACSL,standing lenticular altocumulus
26 ACT,active/activated/activity
33 ADF,automatic direction finder
34 ADIZ,air defense identification zone
45 AFD,Airport/Facility Directory
47 AFSS,Automated Flight Service Station
50 AGL,above ground level
52 AIM,Aeronautical Information Manual
53 AIREPS,aircraft reports
54 AIRMET,Airmen's Meteorological Information
59 ALP,aircraft location point
62 ALS,approach light system
64 ALSF-1,standard 2400' high-intensity approach lighting system with sequenced flashers (Category I configuration)
65 ALSF-2,standard 2400' high-intensity approach lighting system with sequenced flashers (Category II configuration)
66 ALSTG,altimeter setting
76 AMSL,above mean sea level
77 ANAPROP,anomalous propagation
81 AO1,station without a precipitation discriminator
82 AO2,station with a precipitation discriminator
95 ARINC,Aeronautical Radio, Incorporated
97 ARTC,air route traffic control
98 ARTCC,Air Route Traffic Control Center
100 ASAP,as soon as possible
101 ASDA,accelerate-stop distance available
102 ASDAR,aircraft to satellite data relay
104 ASOS,Automated Surface Observing System
107 ATA,actual time of arrival
108 ATCT,airport traffic control tower
109 ATIS,automatic terminal information service
111 AURBO,Aurora Borealis
113 AUTO,automated report
115 AVGAS,aviation gasoline
116 AWOS,automatic weather observing/reporting system
117 AWS,automatic weather station
141 BINOVC,breaks in overcast
167 BRKHIC,breaks in higher clouds
178 CAA,cold air advection
181 CAT,clear air turbulence
182 CAVOK,ceiling and visibility OK
183 CAVU,ceiling and visibility unlimited
184 CB,cumulonimbus cloud
185 CBMAM,cumulonimbus mammatus cloud
187 CC,cirrocumulus cloud
188 CCLDS,clear of clouds
189 CCLKWS,counter-clockwise
190 CCSL,cirrocumulus standing lenticular cloud
193 CFP,cold front passage
201 CHI,cloud-height indicator
202 CHINO,sky condition at secondary location not available
241 CONS,constant/continuous
244 CONTDVD,Continental Divide
247 CONTRAILS,Condensation Trails
249 CONUS,Continental U.S.
251 COR,correction to a previously disseminated observation
268 CUCON,cumulus congestus cloud
269 CUFRA,cumulus fractus
270 CUHU,cumulus humilis cloud
271 CUMED,cumulus medicoris cloud
280 DALR,dry adiabatic lapse rate
283 DC,District of Columbia
292 DELMARVA,Delaware-Maryland-Virginia
330 DOC,Department of Commerce
331 DOD,Department of Defense
332 DOT,Department of Transportation
359 DSTBLZN,destablization
373 DVR,dispatch visual range
378 DVV,downward vertical velocity
385 ECMWF,European Centre for Medium Range Weather Forecasts
389 ELR,environmental lapse rate
397 ENELY,east-northeasterly
398 ENERN,east-northeastern
399 ENEWD,east-northeastward
410 ESELY,east-southeasterly
411 ESERN,east-southeastern
412 ESEWD,east-southeastward
421 EUMETSTAT,European Meteorological Satellite
441 FA,aviation area forecast
442 FAA,Federal Aviation Administration
451 FIBI,filed but impracticable to transmit
454 FIRAV,first available
455 FIRST,first observation after a break in coverage at manual station
458 FLOP,floating-point operation
459 FLOPS,floating-point operations
466 FMH-1,Federal Meteorological Handbook No.1, Surface Weather Observations & Reports (METAR)
467 FMH2,Federal Meteorological Handbook No.2, Surface Synoptic Codes
483 FROIN,Frost On The Indicator
484 FROPA,frontal passage
485 FROSFC,frontal surface
488 FRWF,forecast wind factor
496 FYI,for your information
497 FZRANO,freezing rain sensor not available
500 GARP,Global Atmospheric Research Programme
501 GCM,global computer model
505 GEOREF,geographical reference
506 GEOS,geostationary satellite
509 GLFALSK,Gulf of Alaska
510 GLFCAL,Gulf of California
511 GLFMEX,Gulf of Mexico
512 GLFSTLAWR,Gulf of St. Lawrence
513 GMT,Grenwich Mean Time
527 GTS,Global Telecommunications System
530 HCVIS,high clouds visible
534 HFS,high-friction surface
538 HIFOR,high level forecast
542 HLYR,haze layer aloft
549 HUREP,hurricane report
558 ICAO,International Civil Aviation Organization
560 ICGIC,icing in clouds
561 ICGIP,icing in precipitation
567 IMO,International Meteorological Organization (now WMO)
587 INSAT,Indian Satellite
589 INTCNTL,intercontinental
593 INTMTLY,intermittently
596 INTRMTRGN,intermountain region
598 INTSFCN,intensification
614 ITCZ,Inter-Tropical Convergence Zone
618 KLYR,smoke layer aloft
619 KOCTY,smoke over city
626 LAM,Limited Area model
627 LAST,last observation before a break in coverage at a manual station
632 LCTMP,little change in temperature
636 LFM,Limited Fine Mesh Model
648 LLWAS,low level wind shear alert system
649 LLWS,low level wind shear
657 LORAN,Long Range Navigation
662 LSR,loose snow on the runway
663 LST,Local Standard Time
666 LTGCC,lightning cloud-to-cloud
667 LTGCCCG,lightning cloud-to-cloud cloud-to-ground
668 LTGCG,lightning cloud-to-ground
669 LTGCW,lightning cloud-to-water
670 LTGIC,lightning in cloud
688 MCD,Mesoscale discussion
703 METAR,aviation routine weather report
704 METEOSAT,Meteorological Satellite
720 MOGR,Moderate or greater
721 MOS,Model Output Statistics
722 MOV,moved/moving/movement
728 MPS,meters per second
729 MRF,medium range forecast
738 MSLP,mean sea level pressure
761 NCDC,National Climatic Data Center
762 NCWX,no change in weather
774 NGM,Nested Grid Model
780 NLC,noctilucent cloud
786 NMC,National Meteorological Center
790 NNELY,north-northeasterly
791 NNERN,north-northeastern
792 NNEWD,north-northeastward
795 NNWLY,north-northwesterly
796 NNWRN,north-northwestern
797 NNWWD,north-northwestward
799 NOAA,National Oceanic and Atmospheric Administration
800 NOGAPS,National Oceanographic Global Atmospheric Prediction System
801 NOPAC,Northern Pacific
802 NOS,National Ocean Survey
803 NOSIG,no significant change is expected in next 2 hours
804 NOSPECI,no SPECI reports are taken at the station
805 NOTAM,Notice to Airmen
813 NSW,no significant weather
817 NVA,Negative vorticity advection
822 NWS,National Weather Service
825 OAT,outside air temperature
844 OFCM,Office of the Federal Coordinator for Meteorology
845 OFP,occluded frontal passage
857 OSV,ocean station vessel
876 PBL,planetary boundary layer
885 PIBAL,pilot balloon observation
886 PIBALS,pilot balloon reports
887 PIREP,pilot weather report
888 PIREPS,pilot weather reports
895 PNO,precipitation amount not available
898 PPI,Plan Position Indicator
900 PPSN,present position
909 PRESFR,pressure falling rapidly
910 PRESRR,pressure rising rapidly
913 PRIND,present indications are
939 PSR,packed snow on the runway
946 PVA,positive vorticity advection
952 PWINO,precipitation identifier sensor not available
954 QBO,quasi-biennial oscillation
956 QPFERD,NMC excessive rainfall discussion
957 QPFHSD,NMC heavy snow discussion
958 QPFSPD,NMC special precipitation discussion
959 QSTNRY,quasistationary
964 RADAT,radiosonde observation data
965 RAOB,radiosonde observation
966 RAOBS,radiosonde observations
979 RCRNR,base operations closed
989 RDVLPMT,redevelopment
1010 RH,relative humidity
1011 RHI,Range Height Indicator
1012 RHINO,RHI not operative
1056 RTD,Routine Delayed (late) observation
1064 RVR,runway visual range
1065 RVRNO,RVR system values not available
1074 SA,surface observation
1075 SALR,saturated adiabatic lapse rate
1076 SAO,surface observation
1077 SAOS,surface observations
1088 SCSL,stratocumulus standing lenticular cloud
1095 SELS,Severe Local Storms Unit
1102 SF,sferic (radio interference caused by lightning strikes)
1104 SFERICS,Atmospherics
1105 SFLOC,sferic location
1108 SGFNTLY,significantly
1123 SIERNEV,Sierra Nevada
1125 SIGMET,significant meteorological information
1135 SLP,sea-level pressure
1137 SLPNO,sea-level pressure not available
1138 SLR,slush on the runway
1146 SMS,synchronus meteorological satellite
1156 SNINCR,snow increasing rapidly
1158 SNOINCR,snow increase
1159 SNOINCRG,snow increasing
1164 SOG,snow on the ground
1165 SOP,standard operating procedure
1170 SPECI,an unscheduled report taken when certain criteria have been met
1171 SPENES,satellite precipitation estimate statement
1174 SPLNS,Southern Plains
1189 SSELY,south-southeasterly
1190 SSERN,south-southeastern
1191 SSEWD,south-southeastward
1192 SST,sea surface temperature
1194 SSWLY,south-southwesterly
1195 SSWRN,south-southwestern
1196 SSWWD,south-southwestward
1203 STFR,stratus fractus
1215 STWS,Storm Tide Warning Service
1217 SUBTRPCL,subtropical
1233 SW+,heavy snow shower
1235 SW-,light snow shower
1239 SWOMCD,SELS Mesoscale Discussion
1245 SYNOP,synoptic report
1249 TAF,Terminal Aerodrome Forecast
1250 TCNTL,transcontinental
1251 TCU,towering cumulus cloud
1257 THI,Temperature-Humidity Index
1279 TMPRYLY,temporarilly
1289 TOVC,top of overcast
1304 TRPCD,tropical continental
1308 TRW+,thunderstorm with heavy rain shower
1310 TS+,thunderstorm with heavy snow
1311 TS,thunderstorm with snow
1317 TSHWRS,thundershowers
1318 TSNO,thunderstorm information not available
1320 TSQLS,thundersqualls
1323 TSW+,thunderstorm with heavy snow showers
1324 TSW,thunderstorm with snow showers
1334 UDDF,up and down drafts
1343 UNSATFY,unsatisfactory
1357 UTC,Coordinated Universal Time
1359 UVV,upward vertical velocity
1360 UVVS,upward vertical velocities
1365 VC,(in the) vicinity
1367 VCOT,VFR conditions on top
1369 VDUC,VAS Data Utilization Center (NSSFC)
1376 VIS,visible/visibility
1377 VISNO,visibility at secondary location not available
1384 VMC,visual meteorological conditions
1391 VRISL,Vancouver Island, BC
1393 VRT MOTN,Vertical Motion
1397 VSBYDR,visibility decreasing rapidly
1398 VSBYIR,visibility increasing rapidly
1400 VV,vertical visibility
1403 WAA,Warm Air Advection
1408 WFO,Weather Forecast Office
1409 WFOS,Weather Forecast Offices
1410 WFP,warm front passage
1411 WG/AOS,Working Group for Atmospheric Observing Systems
1412 WG/SO,Working Group for Surface Observations
1415 WIBIS,will be issued
1427 WMO,World Meteorological Organization
1431 WNWLY,west-northwesterly
1432 WNWRN,west-northwestern
1433 WNWWD,west-northwestward
1435 WPLTO,Western Plateau
1439 WRMFNTL,warm Frontal
1448 WSFO,Weather Service Forecast Office
1449 WSFOS,Weather Service Forecast Offices
1452 WSO,Weather Service Office
1453 WSOS,Weather Service Offices
1456 WSWLY,west-southwesterly
1457 WSWRN,west-southwestern
1458 WSWWD,west-southwestward
1466 WW,Severe Weather Watch
1467 WWAMKC,Status Report
1469 WWS,Severe Weather Watches
1487 Z,Zulu (i.e. Coordinated Universal Time)