Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined CUFRA Cumulus Fractus COV Cover or covered or covering CWSU Center Weather Service Unit CYC Cyclonic CYCLGN Cyclogenesis D D Downward (tendency in RVR during previous 10 minutes) DABRK Daybreak DALGT Daylight DBL Double DC District of Columbia DCR Decrease DCRD Decreased DCRG Decreasing DCRGLY Decreasingly DCRS Decreases DE Delaware or from (used to precede the call sign of the calling station) (to be used in AFS as a procedure signal) DEC December DEG Degrees DELMARVA Delaware-Maryland-Virginia DFCLT Difficult DFCLTY Difficulty DFNT Definite DFNTLY Definitely DFRS Differs DGNL Diagonal DGNLLY Diagonally DIF Diffuse DIGG Digging DIR Direction DISC Discontinue DISCD Discontinued DISCG Discontinuing DISRE Disregard DISRED Disregarded DISREG Disregarding DIST Distance DKTS Dakotas DLA Delay or delayed or delay (message type designator) DLT Delete Appendix B: Contractions and Acronyms Page 11-8
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined DLTD Deleted DLTG Deleting DLY Daily DMG Damage DMGD Damaged DMGG Damaging DMNT Dominant DMSH Diminish DMSHD Diminished DMSHG Diminishing DMSHS Diminishes DNG Danger or dangerous DNS Dense DNSLP Downslope DNSTRM Downstream DNWND Downwind DOM Domestic DP Dew point temperature DPND Deepened DPNG Deepening DPNS Deepens DPR Deeper DPT Depth DR… Low drifting (followed by DU =dust, SA = sand or SN = snow) DRFT Drift DRFTD Drifted DRFTG Drifting DRFTS Drift DRG During DS Duststorm DSCNT Descent DSIPT Dissipate DSIPTD Dissipated DSIPTG Dissipating DSIPTN Dissipation DSIPTS Dissipates DSND Descend DSNDG Descending DSNDS Descends Appendix B: Contractions and Acronyms Page 11-9
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined DSNT Distant DSTBLZ Destabilize DSTBLZD Destabilized DSTBLZG Destabilizing DSTBLZS Destabilizes DSTBLZN Destabilization DTG Date-time group DTRT Deteriorate or deteriorating DU Dust DUC Dense upper cloud DUR Duration DURC During climb DURD During descent DVLP Develop DVLPD Developed DVLPG Developing DVLPMT Development DVLPS Develops DVRG Diverge DVRGG Diverging DVRGNC Divergence DVRGS Diverges DVV Downward vertical velocity DWNDFTS Downdrafts DZ Drizzle E E East or eastern longitude EB Eastbound EFCT Effect ELEV Elevation ELNGT Elongate ELNGTD Elongated ELSW Elsewhere EMBD Embedded in a layer (to indicate cumulonimbus embedded in layers of clouds) EMC Environmental Modeling Center EMERG Emergency ENCTR Encounter ENDG Ending ENE East-northeast ENELY East-northeasterly Appendix B: Contractions and Acronyms Page 11-10
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined ENERN East-northeastern ENEWD East-northeastward ENHNC Enhance ENHNCD Enhanced ENHNCG Enhancing ENHNCS Enhances ENHNCMNT Enhancement ENR En route ENTR Entire EQPT Equipment ERN Eastern ERY Early ERYR Earlier ESE East-southeast ESELY East-southeasterly ESERN East-southeastern ESEWD East-southeastward ESNTL Essential ESTAB Establish EST Estimate or estimated or estimate (message type designator) ETA Estimated time of arrival or estimating arrival ETC Et cetera ETD Estimated time of departure or estimating departure ETIM Elapsed time EV Every EVE Evening EWD Eastward EXCLV Exclusive EXCLVLY Exclusively EXC Except EXP Expect or expected or expecting EXTD Extend or extending EXTRAP Extrapolate EXTRAPD Extrapolated EXTRM Extreme EXTRMLY Extremely EXTSV Extensive F F Degrees Fahrenheit or fixed FA Area Forecast (U.S. domestic) Appendix B: Contractions and Acronyms Page 11-11
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined FAA Federal Aviation Administration FAM Familiar FAX Facsimile transmission FBL Light (used to indicate the intensity of weather phenomena, interference or static reports, e.g. FBL RA = light rains) FC Funnel cloud (tornado or waterspout) FCST Forecast FEB February FEW Few FG Fog FIG Figure FILG Filling FIR Flight information region FIRAV First available FL Florida or Flight Level FLD Field FLRY Flurry FLRYS Flurries FLT Flight FLUC Fluctuating or fluctuation or fluctuated FLW Follow(s) or following FLY Fly or flying FM From FM… From (followed by time weather change is forecast to begin) FMT Format FNCTN Function FNTGNS Frontogenesis FNTLYS Frontolysis FORNN Forenoon FPM Feet per minute FQTLY Frequently FRI Friday FRM Form FRMG Forming FRMN Formation FRNG Firing FRONT Front (relating to weather) FROPA Frontal passage FROSFC Frontal surface Appendix B: Contractions and Acronyms Page 11-12
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined FRQ Frequent FRST Frost FRWF Forecast wind factor FSS Flight Service Station FST First FT Feet (dimensional unit) FTHR Further FU Smoke FVRBL Favorable FWD Forward FYI For your information FZ Freezing FZ LVL Freezing level FZDZ Freezing drizzle FZFG Freezing fog FZRA Freezing rain G G Gust or green GA Georgia GAMET Area forecast for low level flights GEN General GENLY Generally GEO Geographic or true GEOREF Geographical reference GFS Global Forecast System (model) GLFALSK Gulf of Alaska GLFCAL Gulf of California GLFMEX Gulf of Mexico GLFSTLAWR Gulf of St. Lawrence GND Ground GR Hail GRAD Gradient GRDL Gradual GRDLY Gradually GRIB Processed meteorological data in the form of grid point values expressed in binary form (aeronautical meteorological code) GRT Great GRTLY Greatly GRTLKS Great Lakes GS Small hail and/or snow pellets Appendix B: Contractions and Acronyms Page 11-13
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined GSTS Gusts GSTY Gusty GTS Global Telecommunication System H HAZ Hazard HDFRZ Hard freeze HDSVLY Hudson Valley HDWND Head wind HGT Height HI Hawaii or high HIFOR High level forecast HJ Sunrise to sunset HLDG Holding HLF Half HLTP Hilltop HN Sunset to sunrise HND Hundred HOL Holiday HPA Hectopascal HPC Hydrometeorological Prediction Center HR Hours HRZN Horizon HTG Heating HURCN Hurricane HUREP Hurricane report HVY Heavy or heavy (used to indicate the intensity of weather phenomena, e.g. heavy rain = HVY RA) HVYR Heavier HVYST Heaviest HWVR However HWY Highway HYR Higher HZ Haze I IA Iowa IAO In and out of clouds IC Icing (PIREPs only) or ice crystals (very small ice crystals in suspension, also known as diamond dust) ICAO International Civil Aviation Organization ICE Icing Appendix B: Contractions and Acronyms Page 11-14
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined ICGIC Icing in clouds ICGICIP Icing in clouds and in precipitation ICGIP Icing in precipitation ID Idaho or identifier or identity IDENT Identification IFR Instrument flight rules IGA International general aviation IL Illinois ILS Instrument landing system IMC Instrument meteorological conditions IMD Immediate or immediately IMPL Impulse IMPLS Impulses IMPR Improve or improving IMT Immediate or immediately IMPT Important INC In cloud 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 INFO Information INOP Inoperative INPR In progress INSTR Instrument INSTBY Instability INTCNTL Intercontinental INTL International INTMD Intermediate INTMT Intermittent Appendix B: Contractions and Acronyms Page 11-15
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined INTMTLY Intermittently INTR Interior INTRP Interrupt or interruption or interrupted INTRMTRGN Intermountain region INT Intersection INTS Intense INTSFCN Intensification INTSF Intensify or intensifying INTST Intensity INTVL Interval INVRN Inversion IOVC In overcast INVOF In vicinity of IPV Improve IPVG Improving ISA International standard atmosphere ISOL Isolated J JAN January JCTN Junction JTST Jet stream JUL July JUN June K KFRST Killing frost KG Kilograms KLYR Smoke layer aloft KM Kilometers KMH Kilometers per hour KOCTY Smoke over city KPA Kilopascals KS Kansas KT Knots KY Kentucky L L Left (runway identification) LA Louisiana LABRDR Labrador LAN Inland Appendix B: Contractions and Acronyms Page 11-16
Aviation Weather Services, Advisory Circular 00-45G, Change 1 (July 2010) Contraction or Acronym Subject Defined LAT Latitude LAWRS Limited aviation weather reporting station LCTMP Little change in temperature LFTG Lifting LGT Light or lighting LGWV Long wave LI Lifted Index LIS Lifted indices LK Lake LKS Lakes LKLY Likely LLJ Low level jet LLWAS Low-level wind shear alert system LLWS Low-level wind shear LN Line LOC Local or locally or location or located LONG Longitude LONGL Longitudinal LRG Long range LRGLY Largely LRGR Larger LRGST Largest LST Local standard time LTD Limited LTG Lightning LTGCC Lightning cloud-to-cloud LTGCG Lightning cloud-to-ground LTGCCCG Lightning cloud-to-cloud, cloud-to-ground LTGCW Lightning cloud-to-water LTGIC Lightning in cloud LTL Little LTLCG Little change LTR Later LTST Latest LV Light and variable (relating to wind) LVE Leave or Leaving LVL Level LWR Lower LWRD Lowered LWRG Lowering Appendix B: Contractions and Acronyms Page 11-17
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