FREQUENTLY USED WEATHER ABBREVIATIONS ===================================== ..................................... - A - .................................. A absolute (temperature) A Alaskan Standard Time (time groups only) A Arctic (air mass) A hail AATM at all times ABBR abbreviate ABCST automatic broadcast ABD aboard ABM abeam ABND abandon ABNDT abundant ABNML abnormal ABT about ABV above AC anticipated convection AC altocumulus AC convective outlook AC altocumulus ACCAS altocumulus castellanus ACCT account ACCUM accumulate ACES access ACFT aircraft ACK acknowledge ACLD above clouds ACLT accelerate ACMPYG accompanying ACPT accept ACPY accompany ACRS across ACSL standing lenticular altocumulus ACT active ACTG acting ACTV active ACTVT activate ACTVTY activity ACYC anticyclonic ADDN addition ADJ adjacent ADQT adequate ADRNDCK Adirondack ADS address ADV advise ADVC advice ADVCTN advection ADVN advance ADVY advisory AERO aeronautical AFB Air Force Base AFC area forecast center AFCT affect AFDK after dark AFIRM affirmative AFOS Automation of Field Operations/Services AFT after AFTN afternoon AGL above ground level AGN again AGR agree AGRMT agreement AHD ahead AIREP air report AK Alaska AL all AL Alabama ALF aloft ALG along ALGHNY Allegheny ALNMT alignment ALNOT Alert Notice ALQDS all quadrants ALSEC all sectors ALSTG altimeter setting ALT altitude ALTA Alberta ALTHO although ALTM altimeter ALTN alternate ALUTN Aleutian ALWF actual wind factor AM ante meridiem AMB ambiguity AMD amend AMDT amendment AMOS Automated Meteorological Observation Station AMP amplifier/amplify AMPLTD amplitude AMS air mass AMSL above mean sea level AMT amount ANCPT anticipate ANLYS analysis ANNC announce ANS answer ANT antenna AOA at or above AOB at or below AOC Aircraft Operations Center AOPA Aircraft Owners and Pilots Association AP anomalous propagation APCH approach APLCN Appalachian APNT appoint APPR appear APRNT apparent APROP appropriate APRX approximate APSG after passage/passing APT automatic picture transmission APV approve APVL approval AR Atlantic Route AR Arkansas ARFOR Area forecast ARMET forecast upper wind and temperature ARND around ARNG arrange ARNOT area notice ARPT airport ARR arrival/arrive ARST arrest AS altostratus ASAP as soon as possible ASC ascent to ASDL aircraft to satellite data link ASGN assign ASL above sea level ASMD assumed ASND ascend ASOS Automated Surface Observing System ASSOCD associated ASST assistant ATCH attach ATLC Atlantic ATMT attempt ATND attend ATTM at this time ATTN attention AURBO Aurora Borealis AUTH authority/authorized AUTO automatic AUTOB Automatic WX Reporting System AUX auxiliary AUZ authorize AVBL available AVG average AVN aviation/Aviation Model AWA advise when able AWANS Aviation WX & NOTAM System AWBE automatic WX broadcast equipment AWE advise when established AWIPS Advanced WX Interactive Processing System AWOS automatic wx obs/report system AWS Air Weather Service (USAF) AWT awaiting AWX account weather AWY airway AZ Arizona AZM azimuth ..................................... - B - .................................. B blue B beginning of precipitation B Bering Standard Time BAC below all clouds BACLIN baroclinic BAL balance BAM Beta Advection model BASE cloud base BATROP barotropic BC back course BC British Columbia BCFG fog patches BCH beach BCKG backing BCM become BCN beacon BCREQ broadcast requested BCST broadcast BCSTN broadcast station BD blowing dust BDA Bermuda BDR border BDRY boundary BFDK before dark BFR before BGN began/begin BHND behind BIFR before encountering IFR conditions BINOVC breaks in overcast BKN broken BL between layers BLD build BLDUP buildup BLKHLS Black Hills BLKT blanket BLN balloon BLO below/below clouds BLSN blowing snow BLZD blizzard BMS basic meteorological services BN blowing sand BND bound BNDRY boundary BNTH beneath BOVC base of overcast BPS bytes per second BR Bahama Route BR branch BRF brief BRG bearing BRGT bright BRK break BRKHIC breaks in higher overcast BRKSHR Berkshire BRM barometer BS blowing snow BTL between layers BTR better BTWN between BUL bulletin BUR bureau BUS business BWER bounded weak echo region BY blowing spray BYD beyond BZR buzzer (radar) ..................................... - C - .................................. C Celsius C Central Standard Time C continental (air mass) CA cloud-to-air lightning CA California CAA cold air advection CAN Canada CANOT Canadian NOTAM CAO cold air outbreak CAPE convective available potential energy CAPT captain CARIB Caribbean CAS calibrated airspeed CASCDS Cascades CAT category CAT clear air turbulence CATX climb and cross CAVOK cloud and visiblity OK CAVU clear and visibility > 10 mi. CAWS Common Aviation Weather Subsystem CB cumulonimbus CBMAM cumulonimbus mamma CC cirrocumulus CC cloud-to-cloud lightning CCLDS clear of clouds CCLKOB counterclockwise orbit CCLKWS counterclockwise CCR cloud cover radiometer CCRZ climb and cruise CCSL standing lenticular cirrocumulus CD cold CDFNT cold front CENPAC Central North Pacific CFM confirm CFN confine CFP cold front passage CFY clarify CG Coast Guard CG cloud-to-ground lightning CGAS Coast Guard Air Station CGLS Coast Guard LORAN Station CGSTN congestion CH channel CHAP chapter CHARC characteristic CHC chance CHG change CHNL channel CHOK check okay CHRG charge CHSPK Chesapeake CHTR charter CI cirrus CIG ceiling CIN convective inhibition CIRNAV circumnavigate CIRNOT circuit notice CIT near or over large towns CIV civil CK check CKT circuit CL closing station CL course line CLA clear type of ice formation CLBI climb immediately CLBR calibration CLD cloud CLDNS cloudiness CLG calling CLIPER Climatology and Persistance model CLKOB clockwise orbit CLKWS clockwise CLNC clearance CLR clear CLRS clear and smooth CLSD closed CLST celestial CM centimeter CMA comma CMB climb CMNC commence CMPCT compact CMPL complete CMPLX complex CMPSN composition CMPT component CNCL cancel CNCNT concurrently CNCT connect CNDN Canadian CNS consolidated NOTAM system CNSDRBL considerable CNSTNT consistent CNTR center CNTRL central CNTRLN centerline CNVG converge CNVRT convert CNVSN conversion CNVTV convective CO company CO county CO Colorado COLL collect COM communication COMB combine COML commercial COMP computed/computer COMPR compare COMPRT compartment COND condition CONF confidential CONFDC confidence CONFIGN configuration CONT continue/continuously CONTDVD Continental Divide CONTRAILS condensation trails CONV convergence COORD coordinate COR correct/corrected COT at the coast COV cover CPBL capable CPD coupled CPHC Central Pacific Hurricane Center CPTY capacity CRAD composite radar data processing CRC circle CRCLN circulation CRLC circulate CRS course CRTFY certify CS cirrostratus CSDR consider CSDRBL considerable CSLDT consolidate CST coast CSTLN coastline CT Connecticut CTC contact CTGY category CTH cloud top height CTL control CTN caution CTSKLS Catskills CU cumulus CUFRA cumulus fractus CVN convene CVR cover CW current wave CWSU Central Weather Service Unit CYC cyclonic CYCLGN cyclogenesis CYL cylinder CZM Coastal Zone Management ..................................... - D - .................................. D dust D/A digital-to-analog DA daylight ascending DABRK daybreak DALGT daylight DAP do all possible DB decibel DB describe DBL double DBTF doubtful DC direct current DC District of Columbia DCAVU clear and vis > 10mi remainder rept missing DCR decrease DCRSD decreased DCT direct DE Delaware DEF defense DEG degree DENEB fog dispersal operations DEP depart/departure DEPT department DEST destination DEV deviation DF direction finding DFCLT difficult DFLNT diffluent DFNT definite DFRS differs DFS diffuse DFUS diffuse DGNL diagonal DGR danger DIAM diameter DIFAX digital facsimile DIGG digging DIP deepest intensification period DIR director DISABLD disabled DISC discontinue DISEM disseminate DISRE disregard DIST district DIST distance DISTR distribute DIV divergence DIV division DKTS Dakotas DLA delay DLT delete DLVR deliver DLVY delivery DLY daily DMG damage DMNT dominant DMSH diminish DMSP Defense Meteorological Satellite Program DNS dense DNSLP downslope DNSTRM downstream DNWND downwind DO ditto DOC Department of Commerce DOD Department of Defense DOE Department of Energy DOLLY data link DOPLID Doppler Lidar DOPLIGHT Doppler and lightning DP deep DPD dew point depression DPNG deepening DPTH depth DR direct route DRCT direct DRCTN direction DRFT drift DRIBU drifting buoy code DRIR direct readout infrared DROP dropsonde/dropwindsonde DRYLN dryline DRZL drizzle DSCNT descent DSGND designated DSIPT dissipate DSND descend DSNT distant DSPL display DSPLC displace DSPN disposition DSPRL dispersal DSR desire DST distort DSTC distance DTG date time group DTL detail DTLN International Dateline DTRM determine DTRT deteriorate DUC dense upper cloud DUPE duplicate DURG during DURN duration DVGNC divergence DVGNT divergent DVLP develop DVOR doppler VOR DVRG diverge DVRSN diversion DVV downward vertical velocity DWG drawing DWIPS Digital Weather Image Processing System DWNDFTS downdrafts DWPNT dew point DX duplex ..................................... - E - .................................. E Eastern Standard Time E ending of precipitation (min) E equatorial (air mass) E estimated E east EBND eastbound ECMRWF European Center for Medium Range WX Forecasts ECOM en-route communications EFCT effect EFF effective ELAT estimated latitude ELEC electric ELECN electrician ELEV elevate/elevation ELIP elliptical ELNAR El Nino in the ancient record ELNGT elongate ELONG estimated longitude ELSW elsewhere EMBDD embedded EMERG emergency EN El Nino ENCTR encounter ENDCE endurance ENDG ending ENERN east-northeastern ENEWD east-northeastward ENHNCD enhanced ENHNCMNT enhancement ENSO El Nino Southern Oscillation ENTR entire EOF expected ops forecast EOF end of file EPAC Eastern Pacific EPI expanded position indicator EQUIP equipment ERY early ESERN east-southeastern ESEWD east-southeastward ESNTL essential EST estimate/estimation EST estimation ESTAB establish ETC et cetera ETFL each thousand ft level ETI estimated information ETIM elapsed time ETOV estimated time over ETP estimated time of penetration EU electronic unit EVAC evacuation EVAL evaluate/evaluation EVE evening EXAM examination EXCH exchange EXCLD exclude EXCLV exclusive EXCP except EXCT execute EXPC expect EXPED expedite EXPS express EXSEC extra section EXTD extend EXTN extension EXTRAP extrapolate EXTRM extreme EXTSV extensive ..................................... - F - .................................. F Fahrenheit F fog F Fujita Scale FA forecast area FAA Federal Aviation Administration FAC facility FAH Fahrenheit FAM familiar FAX facsimile FCST forecast FG fog FIG figure FIL filament FILG filling FINO WX report will not be filed for transmission FIRAV first available FIRG firing FL flash advisory FL flight level FL Florida FLCTN fluctuation FLDST flood stage FLG falling FLO flow FLRY flurry FLT flight FLW follow FLWIS flood warning issued FM from FMT format FNCTN function FNT front FNTGNS frontogenesis FNTL frontal FNTLYS frontolysis FONE telephone FORNN forenoon FPM feet per minute FPP from present position FQT frequent FREQ frequency FRM form FRMG forming FRMN formation FROPA frontal passage FROSFC frontal surface FRST frost FRWF forecast wind factor FRZ freeze FRZN frozen FT feet/foot FT terminal forecast FTHR farther/further FURN furnish FV forward visibility (miles) FWD forward FWDC forward collect FYI for your information ..................................... - G - .................................. G gusts reaching (knots) GA Georgia GAC global area coverage GARP Global Atmospheric Research Program GATE GARP Atlantic Tropical Experiment GCM Global Circulation model GDAS Global Data Assimilation System GEN general GENOT general notice GEO geographic GEOREF geographical reference GF ground fog GFDEP ground fog estimated (feet) deep GFS Gulf Stream Front GHZ gigahertz GICG glaze icing GLDR glider GLFALSK Gulf of Alaska GLFCAL Gulf of California GLFMEX Gulf of Mexico GLFSTLAWR Gulf of St Lawrence GMT Greenwich Mean Time GND ground GNDFG ground fog GNTR generator GOES Geostationary Operational Environmental Satellite GOVT government GRAD gradient GRBL garble GRBNKS Grand Banks GRDL gradual GRTLKS Great Lakes GSTS gusts GSTY gusty GTCL Great Circle GTR greater GTS Global Telecommunication System GV ground visibility GVG giving ..................................... - H - .................................. H haze H2 pres at 200 mb/37K FT) H3 pres at 300 mb/30K FT) H5 pres at 500 mb/18K FT) H7 pres at 700 mb/10K FT) H85 pres at 850 mb/5K FT) HA high accuracy HAA height above airport HAZ hazard HCVIS high clouds visible HD high density HDEP haze layer estimated (feet) deep HDFRZ hard freeze HDSVLY Hudson Valley HDWND headwind HF high frequency HGT height HI high HI Hawaii HIBAL high altitude balloon HIEAT highest temp equaled for all time HIEFM highest temp equaled for the month HIER higher HIESE highest temp equaled so early HIESL highest temp equaled so late HIFOR high level forecast HITMP highest temperature HIXAT highest temp exceeded for all time HIXFM highest temp exceeded for the month HIXSE highest temp exceeded so early HIXSL highest temp exceeded so late HLF half HLSTO hailstones HLTP hilltop HLYR haze layer aloft HND hundred HNL Honolulu HOL holiday HOOK hook echo HP high-precipitation HPA hectopascal HR here HR hour HRD Hurricane Research Division HRDI High-Resolution Doppler Imager HRFAX High-Resolution Facsimile HRPT high resolution picture transmission HRZN horizon HTN heterodyne HURCN hurricane HUREP hurricane report HURRAN Hurricane Analogs model HV high voltage HVY heavy HWVR however HWY highway HX high index HYDRO hydrographic Hz hertz ..................................... - I - .................................. IA Iowa IAW in accordance with IC ice crystals ICG icing ICGIC icing in clouds ICGICIP icing in clouds and precipitation ICGIP icing in precipitation ID identification ID Idaho IDENT identify/identifier or identification IF intermediate fix IF ice fog IFR Instrument Flight Rules IFUN if unable IFVR if visibility remains IL Illinois IMC instrument meteorological conditions IMDT immediate IMGRY imagery IMP impracticable IMPL impulse IMPT important IMT immediate/immediately IN inch IN Indiana INADQT inadequate INC incorporated INCL include INCLV inclusive INCOMP incomplete INCOR incorrect INCR increase INDC indicate INDCTD indicated INDEF indefinite INDUS industrial INFO information INLD inland INOP inoperative INP if not possible INSP inspect INST instrument INSTA interstate INSTBY instability INSTL install INSTR instruct INT intersection INTCNTL intercontinental INTCP intercept INTFC interference INTL international INTMD intermediate INTMT intermittent INTR interior INTRMTRGN inter-mountain region INTRP interrupt INTS intense INTSFY intensify INTST intensity INTVL interval INTXN intersection INVES investigate INVOF in the vicinity of INVR inversion INVSTAR investigate and report IOVC in overcast IP ice pellets IPV improve IPW ice pellet showers IR infra-red IR ice on runway IREG irregular IS island ISOL isolate ITCZ intertropical convergence zone ITNRNT itinerant ITRY itinerary IVFRC in VFR conditions ..................................... - J - .................................. JCTN junction JET jet stream JTSTR jet stream JTWC Joint Typhoon Warning Center ..................................... - K - .................................. K cold (air mass) K smoke KC kilocycles KDEP smoke layer estimated (feet) deep KFRST killing frost KH Kelvin-Helmholtz KHZ kilohertz KLYR smoke layer aloft KM kilometers KOCTY smoke over city KS Kansas KT knot KW kilowatt KY Kentucky ..................................... - L - .................................. L drizzle L logistics L/MF low/medium frequency LA Louisiana LABRDR Labrador LAC local area coverage LAT latitude LAWRS Limited Aviation Weather Reporting Station LB pounds (weight) LCL local/locally LCT locate LCTMP little change in temp LD long distance LDG leading LDR linear depolarization ratio LDW LORAN-C Dropwindsonde LEWP line echo wave pattern LF low frequency LF light fine LFC level of free convection LFM Limited-Area Fine-Mesh model LFT lift LGRNG long range LGT light LGWV long wave LI lifted index LIFR Low IFR-ceiling LIN linearily LK lake LKLY likely LL landline LLJ low-level jet LLWAS low level wind shear alert system LLWS low level wind shear LMT limit LN line LND land LOC locally LOEAT lowest temp equaled for all time LOEFM lowest temp equaled for the month LOESE lowest temp equaled so early LOESL lowest temp equaled so late LONG longitude LONGL longitudinal LOP line of position LORAC long range accuracy LORAN long range navigation LOTMP lowest temp LOXAT lowest temp exceeded for all time LOXFM lowest temp exceeded for the month LOXSE lowest temp exceeded so early LOXSL lowest temp exceeded so late LP low-precipitation LRG large LRG long range LRS Lake Reporting Service LS left side LS light smooth LSR loose snow on runway LST Local Standard Time LTD limited LTG lightning LTGCC lightning cloud-to-cloud LTGCCCG LTGCC/cloud to ground LTGCG lightning cloud-to-ground LTGCW lightning cloud-to-water LTGIC lightning in clouds LTL little LTLCG little change LTNG lightning LTR later LTTR latter LV leaving LVG leaving LVL level LWA lake wind advisory LWR lower LX low index LYR layer ..................................... - M - .................................. M MACH number M maritime (air mass) M measured ceiling M missing M Mountain Standard Time M measured MA map analysis MA Massachusetts MACH MACH Number MAG magnetic MAINT maintain/maintenance MALF mostly aloft precipitation MAN Manitoba MAN manual MAX maximum MB millibars MCC mesoscale convective complex MCS mesoscale convective system MD Maryland MDFY modify MDT moderate ME Maine MED medium MEGG merging MET meteorological METAR aviation routine weather report METOF meteorological officer METRO metropolitan MEX Mexico MF medium frequency MFE mean forecast errors MHDG magnetic heading MHKVLY Mohawk Valley MHz Megahertz MI mile MI Michigan MID middle MIDIZ Mid-Canada Identification Zone MIDN midnight MIFG patches of shallow fog not deeper than 2 meters MIL military MIN minimum MIN minute MIPS Mission and Information Planning System MISC miscellaneous MISG missing MKD marked MKR marker MLTLVL melting level MM millimeter MMIPS Man-Made Interactive Processing System MMO main meteorological office MN Minnesota MNLD mainland MNLY mainly MO Missouri MOGR moderate or greater MONTR monitor MOREPS monitor station reports MOS model output statistics MOV move MPH miles per hour MRF Medium Range Forecast model MRGL marginal MRNG morning MRTM maritime MS minus MS Mississippi MSG message MSL mean sea level MSLP mean sea level pressure MSTLY mostly MSTR moisture MT Montana MTN mountain MTRL material MTRY momentary MULT multiple MUNI municipal MV millivolt MVFR marginal visual flight rules MXD mixed ..................................... - N - .................................. N north N/A not applicable NAB not above NAP not at present NAR North American Route NAT North Atlantic NATL national NAV navigation NAWAS National Warning System NB New Brunswick NBND northbound NBRHD neighborhood NC no change NC North Carolina NCWX no change in weather ND North Dakota NE Nebraska NE northeast NEC necessary NEG negative NELY northeasterly NEW ENG New England NEXRAD Next Generation Weather Radar NFLD Newfoundland NFQ night frequency NGM Nested Grid Model NGT night NH New Hampshire NHC National Hurricane Center NHC90 NHC 1990 forecast model NHD not heard NIL none NJ New Jersey NL no layers NLT not later than NM nautical mile NM New Mexico NMBR number NMC National Meteorological Center NMCC nocturnal MCC NML nominal NMR nautical mile radius NMRS numerous NNERN north-northeastern NNEWD north-northeastward NNMI non-linear normal mode initialization NNWRN north-northwestern NNWWD north-westward NOGAPS US Navy Operational Global Atmospheric Prediction System NOIFN no information NOREP no report NORPI no Balloon Observation NOSPL not required to take special observations NOTAM Notice(s) To Airmen NPRS non-persistent NR near NR number NRW narrow NS nimbostratus NS Nova Scotia NSCSWD no small craft or storm warning NSSFC National Severe Storm Forecast Center NSSL National Severe Storms Laboratory NTE not to exceed NV Nevada NVA negative vorticity advection NVV negative vertical velocity NW northwest NWLY northwesterly NWP Numerical Weather Prediction NWRN northwestern NWS National Weather Service NXT next NY New York ..................................... - O - .................................. OAC oceanic area control OAT outside air temperature OB on board OBS observation OBSC obscure OBST obstruct OBSTN obstruction OC obstruction chart OCFNT occluded front OCLD occlude OCLN occlusion OCNL occasional OCR occur ODW Omega Dropwindsonde OFFL official OFP occluded frontal passage OFSHR offshore OH Ohio OI optimal interpolation OK operating normally OK Oklahoma OLR outgoing longwave radiation OM out for maintenance OMTNS over mountains ONSHR on shore ONT Ontario ONW on watch OOT out of tolerance OPER operate OPN operation OPNML operations normal OR Oregon ORGPHC orographic ORIG original OSF Operational Support Facility OTAS on top and smooth OTLK outlook OTO Oklahoma Thunderstorm Outlook OTR other OTRW otherwise OTS out of service OVC overcast OVD overdue OVHD overhead OVLA overlay OVR over OVRN overrun OVSEA overseas OVTK overtake ..................................... - P - .................................. P Pacific Standard Time P Polar (air mass) PA pressure altitude PA Pennsylvania PAC Pacific PALF partly aloft precipitation PARA paragraph PAT pattern PBL probable PCLL persistent cells PCPN precipitation PD period PDMT predominant PDS particularly dangerous situation PDW priority delayed weather PE primitive equation models PEN peninsula PENT penetrate or penetration PERF perforator PERM permanent PGTSND Puget Sound PIREP pilot weather report PIREPS Pilot Aviation Weather Reports PIRFC pilot requests forecast PISE no pilot balloon obs due to unfavorable sea conditions PISO no pilot balloon obs due to snow PIWI no pilot balloon obs due to surface wind PLAT present latitude PLB planetary boundary layer PLONG present longitude PLS please PLW plow (snow) PNHDL Panhandle POP probability of precipitation POS positive PP perfect prog PPI plan position indicator PPINA PPI not available PPINE PPI no echoes observed PPINO PPI report equipment inoperative PPIOK PPI equipment operation resumed PPIOM PPI equipment out for maintenance PPS propose PPSN present position PR photo reconnaissance PRBL probable PRBLTY probability PRCTN precaution PRECD precede PREFNTL pre-frontal PRELIM preliminary PRES pressure PRESFR pressure falling rapidly PRESRR pressure rising rapidly PRIM primary PRIND present indications are PRIRA primary radar PRJMP pressure jump PROC procedure PROCD proceed PROG prognosis/prognostic PROG progress PROGV progressive PROPA propagation PRP prepare PRSNT present PRST persist PRVD provide PS plus PSBL possible PSG passage PSG passing PSN position PSR packed snow on runway PST Pacific Standard Time PT procedure turn PTCHY patchy PTCP participate PTLY partly PTN portion PUB public PUBL publish PUP Principal User Processor PVA positive vorticity advection PVL prevail PVLD prevailed PVLT prevalent PWB pilot weather briefing PWR power PWRNO power failure PWROK power restored ..................................... - Q - .................................. Q squall QLFY qualify QLM Quasi-Lagrangian model QLTY quality QN question QNTY quantity QSTNRY quasi-stationary QTR quarter QUAD quadrant QUE Quebec ..................................... - R - .................................. R rain RABA no RAWIN obs. no balloons available RABAL radiosonde balloon wind data RABAR radiosonde balloon release RACO no RAWIN obs. communications out RADAR radio detection and ranging RADAT radiosonde observation data RADNO report missing account radio failure RADON radar beacon RADU Weather Radar Analysis and Development Unit RAFI radiosonde observation not filed RAFRZ radiosonde observation freezing levels RAFS Regional Analysis and Forecast System RAHE no RAWIN obs. no gas available RAICG radiosonde observation icing RAJAM radar jamming RAMOS Remote Automated Meteorological Observation Station RAOB rawinsonde observation RARAD radar advisory RAREP radar weather report RASS Radio Acoustic Sounding System RAVU radiosonde analysis and verification unit RAWE no RAWIN obs. unfavorable weather RAWI no RAWIN obs. high and gusty winds RAWIN upper winds obs. (by radio methods) RAWX returned account of weather RBN radio beacon RC road reconnaissance 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 (breakdown) RCDOM radar cloud detector inoperative (maintenance) RCF remain on company frequency RCH reach RCK radio check RCKY Rockies (mountains) RCMD recommend RCON reconfiguration RCPT receipt RCRD record RCV receive RDA Radar Data Acquisition RDAT radar data (digitized) RDC reduce RDG ridge RDS radius RDWND radar dome wind RE reference RE regard RECCO reconnaissance code RECON reconnaissance REF reference REG regulation RELBL reliable RELCT relocate REP represent REPL replace REQ request REQID request if desired REQSTD requested RERTE reroute RES reserve RESP response RESTR restrict RF radio frequency RFD rear flank downdraft RFI radio frequency interference RFS refuse RGD ragged RGLR regular RGN region RH relative humidity RHI range height indicator RHINO radar range height indicator not operating on scan RI Rhode Island RIF reduction in force RIOGD Rio Grande RIS reports identification symbol RITE right (direction of turn) RL report immediately upon leaving RLS release RLSTN relay station RLTV relative RLV relieve RM remarks (PIREP only) RMLR radar microwave link repeater RMLT radar microwave link terminal RMN remain RMNDR remainder RMRK remark RNAV area navigation RNFL rainfall RO regional office ROBEPS radar operating below prescribed standard ROI Regional Optimum Interpolation ROT rotate ROTG rotating ROTN rotation ROV report over RPD rapid RPG Radar Product Generator RPLC replace RPM rotation per minute RPRT report RPT repeat RQ request RQR require RR radar range station RS right side RS record special observation RSG rising RSN reason RSTR restrict RSVN reservation RTE route RTIR real-time infra-red RTMTR remote transmitter RTND retained RTNE routine RTRD retard RTRN return RUF rough RV radar vector RVR Runway Visual Range RVS revise RW rain shower RWU rain showers of unknown intensity RY runway ..................................... - S - .................................. S snow S south SA scheduled record observation SAB satellite analysis branch SANBAR Sanders, et al, barotropical model SAO surface airways observations SASK Saskatchewan SATFY satisfactory SATR so as to reach SAWRS Supplementary Aviation WX Reporting Station SBSD subside SBSDNC subsidence SC stratocumulus SC South Carolina SCA Small Craft Advisory SCLN semicolon SCNDRY secondary SCSL standing lenticular stratocumulus SCT scattered SCTR sector SCTY security SD South Dakota SDBY standby SDM structural dynamic model SE southeast SELS severe local storms unit of NSSFC SELY southeasterly SENS sensitivity SEPN separation SEQ sequence SERN southeastern SFC surface SFERICS atmospherics SG snow grains SGD signed SGD Solar-Geophysical Data SGFNT significant SGL signal SHF super high frequency SHFT shift SHLW shallow SHP standard holding procedure SHRT short SHRTLY shortly SHRTWV shortwave SHTDN shutdown SHUD should SHWR shower SI straight-in approach SIERNEV Sierra Nevada SIG signature SIGMET significant meteorological information SIM satellite interpretation message SIMUL simultaneous SINKG sinking SIR snow and ice on runway SK sky cover SKC sky clear SKED schedule SL sea level SLCT select SLD solid SLGT slight SLO slow SLOSH sea land overlake surge from hurricanes model SLP slope SLR slush on runway SLT sleet SLY southerly SM statute mile SMK smoke SML small SMO surface meteorological observation SMR statute mile radius SMRY summary SMT submit SMTH smooth SMTM sometime SMWHT somewhat SNBNK snowbank SND sand/sanded/sanding SNFLK snowflake SNGL single SNOINCR snow depth increase in past hour SNW snow SNWFL snowfall SOI Southern Oscillation Index SP station pressure SP special observation SP snow pellets SPAN Stored Program for Alpha Numerics SPCLY especially SPD speed SPEC specification SPEC spectral model SPKL sprinkle SPL special SPLNS South Plains SPRD spread SPRL spiral SQAL squall SQLN squall line SR sunrise SRCH search SRND surround SS sunset SSERN south-southeastern SSEWD south-southeastward SSH sea surface height SSI Showalter stability index SST sea surface temperature SSWRN south-southwestern SSWWD south-southwestward ST saint ST stratus STAGN stagnation STBL stable STD standard STDLY steadily STDY steady STFR stratus fractus STFRA stratus fractus STFRM stratiform STG strong STLT satellite STM storm STN station STNRY stationary SUB substitute SUBFIX subject to correction SUF sufficient SUG suggest SUP supply SUPCHG supercharge SUPPL supplement SUPR superior SUPSD supersede SUSP suspend SVC service SVCBL serviceable SVFR special visual flight rules SVG serving SVR severe SVRL several SW snow showers SW southwest SWAP severe weather avoidance plan SWB scheduled weather broadcast SWEAT severe weather threat index SWH significant wave height SWIS Satellite WX Information System SWLG swelling SWLY southwesterly SWO Severe Weather Outlook SWODY1 SWO for Day 1 SWRN southwestern SX stability index SXN section SYNC synchronous SYNOP synoptic SYNS synopsis SYS system ..................................... - T - .................................. T thunderstorm T trace T training T tropical (air mass) T true (bearing) T transverse T+ severe thunderstorms TA temperature (PIREP only) TAND tandum TARND turn around TB turbulence (PIREP only) TBJT turbojet TC time check TC tropical cyclone TCD tropical cyclone discussion TCHD threshold crossing height downwind TCHU threshold crossing height upwind TCNTL trans-continental TCOM terminal communications TCPOD tropical cyclone plan of the day TCU towering cumulus TD touchdown TD tropical depression TDA today TDEL time delay TDZ touchdown zone TEL telecommunications TEMP temperature TERPS terminal instrument procedures TET tetrahedron TF terrain following TF thermal fine TFC traffic THD thunderhead THDR thunder THK thick THKNS thickness THN thin THR threshold THRFTR thereafter THRU through THRUT throughout THSD thousand THTN threaten TIL until TIP until past TKO takeoff TLRNC tolerance TLWD tailwind TM time (PIREP only) TMPRY temporary TMT transmit TMW tomorrow TN Tennessee TNDCY tendency TNGT tonight TNO no thunderstorm information TNTV tentative TOC to be continued TOGA Tropical Oceans and Global Atmosphere Program TOP cloud top TORN tornado TOT time of transmission TOVC top of overcast TOY time of year TP aircraft type TPG topping TRAJS trajectories TRBL trouble TRIB tributary TRML terminal TRMM Tropical Rainfall Measuring Mission TRMT terminate TROF trough TROP tropopause TRPC tropic TRPCD tropical continental (air mass) TRPCL tropical TRPLYR trapping layer TRRN terrain TRSN transition TRTD treated TS thermal smooth TS tropical storm TSAF Tropical Satellite Analysis & Forecast unit TSATLC Trans-Atlantic TSFR transfer TSHWR thundershower TSNT transient TSPAC Trans-Pacific TSQLS thundersqualls TSTM thunderstorm TURBC turbulence TURBT turbulent TVL travel TVS tornadic vortex signature TWD toward TWEB transcribed weather broadcast TWI twilight TWO tropical weather outlook TWR tower visibility TWRG towering TWRIN tower in an obscuration TX Texas ..................................... - U - .................................. U intensity unknown UA a pilot report UAB until advised by UDDF up and down drafts UFA until further advised UFN until further notice UFO unidentified flying object UHF ultra high frequency UM unable to maintain UN unable UNAPV unable to approve UNATNDD unattended UNAVBL unavailable UNDLD undelivered UNEC unnecessary UNHRD unheard UNID unidentified UNKN unknown UNL unlimited UNLCTD unlighted UNMON unable to monitor UNOFF unofficial UNOFFL unofficial UNRDBL unreadable UNRELBL unreliable UNRSTD unrestricted UNSATFY unsatisfactory UNSBL unseasonable UNSKED unscheduled UNSTBL unstable UNSTDY unsteady UNSTL unsettle UNUSBL unusable UPDFTS up drafts UPR upper UPSLP upslope UPSTRM upstream URG urgent USBL usable UT Utah UTC Coordinated Universal Time UTH upper tropospheric humidity UUA urgent PIREP UVV upward vertical velocity UWNDS upper winds ..................................... - V - .................................. V variable VA Victor Airways VA Virginia VARN variation VAULT echo-free vault/ BWER VCNTY vicinity VCTR vector VDP visual descent point VFY verify VHF very high frequency VHRR very high-resolution radiometer VIL vertically integrated liquid water vapor VIP video integrator processor VIS visibility VLCTY velocity VLF very low frequency VLNT violent VLY valley VMC visual meteorological conditions VOL volume VORT vorticity VORTLOBE vortex lobe VORTMAX vortex maximum VOU voucher VR veer VRBL variable VRG veering VRISL Vancouver Island BC VRT MOTN vertical motion VSB visible VSBY visibility VSBYDR visibility decreasing rapidly VSBYIR visibility increasing rapidly VT Vermont VTR vector ..................................... - W - .................................. W indefinite ceiling W warm (air mass) W west WA AIRMET WA Washington WAA warm air advection WBTS whereabouts WDLY widely WDSPRD widespread WEA weather WEFAX Weather Encoded Facsimile WER weak echo region WFO weather forecast office WFP warm front passage WI Wisconsin WI with WIBIS will be issued WILCO will comply WINT winter WIP work in progress WK weak WKDAY weekday WKEND weekend WKN weaken WL will WLYS westerlies WMO World Meteorological Organization WND wind WNWRN west-northwestern WNWWD west-northwestward WO without WORM write once read many WP waypoint WPLTO Westem Plateau WR wet runway WRAPARND wrap-around WRM warm WRMFNT warm front WRNG warning WRS worse WS SIGMET WSHFT wind shift WSO Weather Service Office WSR wet snow on runway WSR weather surveillance Radar WSR-57 WSR-1957 WSR-74 WSR-1974 WSR-88D WSR-1988 Doppler WSTCH Wasatch Range WSWRN west-southwestern WSWWD west-southwestward WT weight WTR water WTSPT waterspout WV wave WV water vapor WV wind at altitude (PIREP only) WV West Virginia WW severe weather forecast WWW World Weather Watch WX weather WXCON weather reconnaissance flight pilot report WY Wyoming Wl within ..................................... - X - .................................. XCP except XPC expect XPLOS explosive XREP auxiliary report XTAL crystal XTLK cross talk ..................................... - Y - .................................. Y Yukon Standard Time YDA yesterday YKN Yukon YLSTN Yellowstone ..................................... - Z - .................................. Z Greenwich Mean Time ZI zonal index ZI zone of interior ZL freezing drizzle ZONE forecast zone ZR freezing rain ZRNO info. on freezing rain will not be available ==============================================================================