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
==============================================================================
