Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined LRY Layer or layered M M Meters (preceded by figures) or Mach number (followed by figures) MA Massachusetts MAG Magnetic MAINT Maintenance MAN Manitoba MAR March MAX Maximum MAY May MB Millibar MBST Microburst MCD Mesoscale discussion MD Maryland MDFY Modify MDFYD Modified MDFYG Modifying MDL Model MDLS Models MDTLY Moderately ME Maine MED Medium MEGG Merging MESO Mesoscale MET Meteorological or meteorology METAR Aviation routine weather report (in aeronautical meteorological code) METRO Metropolitan MEX Mexico MHKVLY Mohawk Valley MI Michigan MID Mid-point (related to RVR) MIDN Midnight MIFG Shallow fog MIL Military MIN Minutes MISG Missing MLTLVL Melting level MN Minnesota MNLD Mainland MNM Minimum Appendix B: Contractions and Acronyms Page 11-18
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined MNLY Mainly MNT Monitor or monitoring or monitored MNTN Maintain MO Missouri MOD Moderate (used to indicate the intensity of weather phenomena, interference or static reports, e.g. moderate rain = MOD RA) MOGR Moderate or greater MON Monday or above mountains MOPS Minimum operational performance standards MOV Move or moving or movement MPH Miles per hour MPS Meters per second MRG Medium range MRGL Marginal MRGLLY Marginally MRNG Morning MRTM Maritime MS Mississippi or minus MSG Message MSL Mean sea level MST Most MSTLY Mostly MSTR Moisture MT Montana or mountain MTW Mountain waves MULT Multiple MULTILVL Multilevel MWO Meteorological watch office MX Mixed type of ice formation (white and clear) N N North or northern latitude or no distinct tendency (in RVR during previous 10 minutes) NAB Not above NAM North American Mesoscale (model) NAT North Atlantic NAV Navigation NB New Brunswick or northbound NBFR Not before NBRHD Neighborhood NC North Carolina or no change Appendix B: Contractions and Acronyms Page 11-19
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined NCEP National Center of Environmental Prediction NCO NCEP Central Operations NCWX No change in weather ND North Dakota NE Nebraska or northeast NEB Northeast bound NEC Necessary NEG No or negative or permission not granted or that is not correct NEGLY Negatively NELY Northeasterly NERN Northeastern NEWD Northeastward NEW ENG New England NFLD Newfoundland NGT Night NH New Hampshire NHC National Hurricane Center NIL None or I have nothing to send to you NJ New Jersey NL No layers NLT Not later than NLY Northerly NM New Mexico or nautical miles NMBRS Numbers NML Normal NMRS Numerous NNE North-northeast NNELY North-northeasterly NNERN North-northeastern NNEWD North-northeastward NNW North-northwest NNWLY North-northwesterly NNWRN North-northwestern NNWWD North-northwestward NNNN End of message NOAA National Oceanic and Atmospheric Administration NOPAC Northern Pacific NOSIG No significant change (used in trend-type landing forecasts) NOV November NPRS Non-persistent Appendix B: Contractions and Acronyms Page 11-20
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined NR Number NRLY Nearly NRN Northern NRW Narrow NS Nova Scotia or nimbostratus NSC Nil significant cloud NSW Nil significant weather NTFY Notify NTFYD Notified NTL National NV Nevada NVA Negative vorticity advection NW Northwest NWB Northwest bound NWD Northward NWLY Northwesterly NWRN Northwestern NWS National Weather Service NY New York NXT Next O OAT Outside air temperature OBS Observe or observed or observation OBSC Obscure or obscured or obscuring OCFNT Occluded front OCLD Occlude OCLDS Occludes OCLDD Occluded OCLDG Occluding OCLN Occlusion OCNL Occasional or occasionally OCR Occur OCRD Occurred OCRG Occurring OCRS Occurs OCT October OFC Office OFP Occluded frontal passage OFSHR Offshore OH Ohio Appendix B: Contractions and Acronyms Page 11-21
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined OHD Overhead OK Oklahoma or we agree or it is correct OMTNS Over mountains ONSHR On shore OPA Opaque, white type of ice formation OPC Ocean Prediction Center OPN Open or opening or opened OPR Operator or operate or operative or operating or operational OR Oregon ORGPHC Orographic ORIG Original OSV Ocean station vessel OTLK Outlook (used in SIGMET messages for volcanic ash and tropical cyclones) OTP On top OTR Other OTRW Otherwise OUBD Outbound OUTFLO Outflow OVC Overcast OVNGT Overnight OVR Over OVRN Overrun OVRNG Overrunning OVTK Overtake OVTKG Overtaking OVTKS Overtakes P PA Pennsylvania PAC Pacific PATWAS Pilot’s automatic telephone weather answering service PBL Planetary boundary layer PCPN Precipitation PD Period PDMT Predominant PEN Peninsula PERM Permanent PGTSND Puget Sound PHYS Physical PIBAL Pilot balloon observation PIREP Pilot weather report Appendix B: Contractions and Acronyms Page 11-22
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined PL Ice pellets PLNS Plains PLS Please PLTO Plateau PLVL Present level PM Postmeridian PNHDL Panhandle PO Dust/sand whirls (dust devils) POS Positive POSLY Positively POSS Possible PPI Plan position indicator PPINA Plan position indicator not available (U.S. Weather Radar Report) PPINE Plan position indicator no echoes (U.S. Weather Radar Report) PPSN Present position PRBL Probable PRBLY Probably PRBLTY Probability PRECD Precede PRECDD Preceded PRECDG Preceding PRECDS Precedes PRES Pressure PRESFR Pressure falling rapidly PRESRR Pressure rising rapidly PRFG Aerodrome partially covered by fog PRI Primary PRIN Principal PRIND Present indications are PRJMP Pressure jump PROB Probability PROC Procedure PROD Produce PRODG Producing PROG Forecast PROGD Forecasted PROGS Forecasts PRSNT Present PRSNTLY Presently PRST Persist Appendix B: Contractions and Acronyms Page 11-23
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined PRSTS Persists PRSTNC Persistence PRSTNT Persistent PRVD Provide PRVDD Provided PRVDG Providing PRVDS Provides PS Plus PSG Passing PSN Position PSND Positioned PSR Primary surveillance radar PTCHY Patchy PTLY Partly PTNL Potential PTNLY Potentially PTNS Portions PUGET Puget Sound PVA Positive vorticity advection PVL Prevail PVLD Prevailed PVLG Prevailing PVLS Prevails PVLT Prevalent PWB Pilot weather briefing PWR Power Q QFE Atmospheric pressure at aerodrome elevation QN Question QNH Altimeter sub-scale setting to obtain elevation when on the ground QSTNRY Quasistationary QTR Quarter QUAD Quadrant QUE Quebec R R Right (runway identification) or rain (U.S. Weather Radar Reports) RA Rain RADAT Radiosonde additional data RAFC Regional area forecast centre RAG Ragged Appendix B: Contractions and Acronyms Page 11-24
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined RAOB Radiosonde observation RCH Reach or reaching RCKY Rocky RCKYS Rockies RCMD Recommend RCMDD Recommended RCMDG Recommending RCMDS Recommends RCRD Record RCRDS Records RDC Reduce RDGG Ridging RDL Radial RDVLP Redevelop RDVLPG Redeveloping RDVLPMT Redevelopment RE… Recent (used to qualify weather phenomena, e.g. RERA = recent rain) REC Receive or receiver RECON Reconnaissance REF Reference to…or refer to… REP Report or reporting or reporting point RES Reserve REQ Request or requested RESP Response RESTR Restrict RGLR Regular RGN Region RGNS Regions RH Relative humidity RI Rhode Island RITE Right (direction of turn) RIOGD Rio Grande RLBL Reliable RLTV Relative RLTVLY Relatively RMK Remark RMN Remain RMND Remained RMNDR Remainder RMNG Remaining Appendix B: Contractions and Acronyms Page 11-25
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined RMNS Remains RNFL Rainfall ROFOR Route forecast (in aeronautical meteorological code) ROT Rotate ROTD Rotated ROTG Rotating ROTS Rotates RPD Rapid RPDLY Rapidly RPLC Replace or replaced RPT Repeat or I repeat (to be used in AFS as a procedure signal) RPTG Repeating RPTS Repeats RQMNTS Requirements RQR Require RQRD Required RQRG Requiring RQRS Requires RRA (or RRB, RRC…etc., in sequence) Delayed meteorological message (message type designator) RSG Rising RSN Reason RSNG Reasoning RSNS Reasons RSTR Restrict RSTRD Restricted RSTRG Restricting RSTRS Restricts RTD Delayed (used to indicate delayed meteorological message; message type designator) RTE Route RTN Return or returned or returning RTS Return to service RUC Rapid Update Cycle (model) RUF Rough RUFLY Roughly RVR Runway visual range RVS Revise RVSD Revised RVSG Revising Appendix B: Contractions and Acronyms Page 11-26
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined RVSS Revises RWY Runway S S South or southern latitude SA Sand SAP As soon as possible SARPS Standards and Recommended Practices (ICAO) SASK Saskatchewan SAT Saturday SATFY Satisfactory SB Southbound SBSD Subside SBSDD Subsided SBSDNC Subsidence SBSDS Subsides SC South Carolina or stratocumulus SCND Second SCSL Stratocumulus Standing Lenticular SCT Scattered SD South Dakota SE Southeast SEB Southeast bound SEC Seconds SECT Sector SELY Southeasterly SEP September SEPN Separation SEQ Sequence SER Service or servicing or served SERN Southeastern SEV Severe (used to qualify icing and turbulence reports) SEWD Southeastward SFC Surface SG Snow grains SGFNT Significant SGFNTLY Significantly SH… Showers (followed by RA = rain, SN = snow, PL = ice pellets, GR = hail, GS = small hail and/or snow pellets or combinations thereof, e.g. SHRASN = showers of rain and snow) SHFT Shift Appendix B: Contractions and Acronyms Page 11-27
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined SHFTD Shifted SHFTG Shifting SHFTS Shifts SHLD Shield SHLW Shallow SHRT Short SHRTLY Shortly SHRTWV Shortwave SHUD Should SIERNEV Sierra Nevada SIG Signature SIGMET Significant Meteorological Information (Information concerning en-route weather phenomena which may affect the safety of aircraft operations) SIGWX Significant weather SIMUL Simultaneous or simultaneously SKC Sky clear SKED Schedule or scheduled SLD Solid SLGT Slight SLGTLY Slightly SLP Slope SLPG Sloping SLW Slow SLY Southerly SM Statute mile SML Small SMLR Smaller SMRY Summary SMTH Smooth SMTHR Smoother SMTHST Smoothest SMTM Sometime SMWHT Somewhat SN Snow SNBNK Snow bank SNFLK Snowflake SNGL Single SNOINCR Snow increase SNOINCRG Snow increasing SOP Standard operating procedure Appendix B: Contractions and Acronyms Page 11-28
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined SPC Storm Prediction Center SPCLY Especially SPD Speed SPECI Aviation selected special weather Report (in aeronautical meteorological code) SPECIAL Special meteorological report (in abbreviated plain language) SPKL Sprinkle SPLNS Southern Plains SPRD Spread SPRDG Spreading SPRDS Spreads SPRL Spiral SQ Squall SQL Squall line SR Sunrise SRG Short range SRN Southern SRND Surround SRNDD Surrounded SRNDG Surrounding SRNDS Surrounds SRY Secondary SS Sunset or sandstorm SSE South-southeast SSELY South-southeasterly SSERN South-southeastern SSEWD South-southeastward SSW South-southwest SSWLY South-southwesterly SSWRN South-southwestern SSWWD South-southwestward ST Stratus STAGN Stagnation STBL Stable STBLTY Stability STD Standard STDY Steady STFR Stratus Fractus STF Stratiform STG Strong STGLY Strongly Appendix B: Contractions and Acronyms Page 11-29