A
AAF - Army Air Field
AAL - above aerodrome level
AATM - at all times
ABD – aboard
ABNDT - abundant
ABNML - abnormal
ABT - about
ABV - above
AC - altocumulus
ACARS - Aircraft communication addressing & reporting system
ACCUM - accumulate
ACFT - aircraft
ACK - acknowledge
ACL - altimeter check location
ACLD - above clouds
ACLT - accelerate
ACPT - accept
ACR - air carrier
ACRBT - acrobatic
ACRS - across
ACSL - standing lenticular altocumulus
ACT - active or activated or activity
ACTG - acting
ACTV - active
ACTVT - activate
ACYC - anticyclonic
ADA - advisory area
ADDN - addition
ADF - automatic direction finder
ADIZ - air defense identification zone
ADJ - adjacent
ADQT - adequate
ADRNDCK - adirondack
ADV - advise
ADVCTN - advection
ADVN - advance
ADVY - advisory
ADVZY - advisory
AFB - Air Force Base
AFCT - affect
AFD - Airport/Facility Directory
AFDK - after dark
AFSS - Automated Flight Service Station
AFT - after
AFTN - afternoon
AGL - above ground level
AHD - ahead
AIM - Aeronautical Information Manual
AIRMET - Airmen's Meteorological Information
ALF - aloft
ALG - along
ALGHNY - Allegheny
ALNMT - alignment
ALQDS - all quadrants
ALS - approach light system
ALSEC - all sectors
ALSF-1 - standard 2400' high-intensity approach lighting system with sequenced flashers (Category I configuration)
ALSF-2 - standard 2400' high-intensity approach lighting system with sequenced flashers (Category II configuration)
ALSTG - altimeter setting
ALT - altitude
ALTA - Alberta
ALTM - altimeter
ALTN - alternate
ALUTN - Aleutian
AM - ante meridiem
AMS - air mass
AMSL - above mean sea level
ANCPT - anticipate
ANLYS - analysis
AO1 - ASOS automated observation without recipitation discriminator (rain/snow)
AO2 - ASOS automated observation with precipitation discriminator (rain/snow)
AOA - at or above
AOB - at or below
AOE - airport of entry
APCH - approach
APL - airport lights
APLCN - Appalachian
APN - Apron
APRNT - apparent
APROP - appropriate
APRX - approximate
ARB - Air Reserve Base
ARFOR - area forecast
ARINC - Aeronautical Radio, Incorporated
ARND - around
ARTC - air route traffic control
ARTCC - Air Route Traffic Control Center
AS - altostratus
ASAP - as soon as possible
ASDA - accelerate-stop distance available
ASL - above sea level
ASOS - automated surface observing system
ASPH - asphalt
ATA - actual time of arrival
ATIS - automatic terminal information service
ATLC - Atlantic
AURBO - Aurora Borealis
AUTH - authorized
AUTO - automatic
AVG - average
AVGAS - aviation gasoline
AWOS - automatic weather observing/reporting system
AWY - airway
AZM - azimuth

B
BACLIN - Baroclinic 
BAJA - Baja California 
BATROP - Barotropic 
BC - British Columbia 
BCH - Beach 
BCKG - Backing 
BCM - Become 
BCMG - Becoming 
BCMS - Becomes 
BD - Blowing dust 
BDA - Bermuda 
BDRY - Boundary 
BFDK - Before dark 
BFR - Before 
BGN - Begin 
BGNG - Beginning 
BGNS - Begins 
BHND - Behind 
BINOVC - Breaks in overcast 
BKN - Broken 
BLD - Build 
BLDG - Building 
BLDS - Builds 
BLDUP - Buildup 
BLKHLS - Black Hills 
BLKT - Blanket 
BLKTG - Blanketing 
BLKTS - Blankets 
BLO - Below 
BLZD - Blizzard 
BN - Blowing sand 
BND - Bound 
BNDRY - Boundary 
BNDRYS - Boundaries 
BNTH - Beneath 
BOOTHEEL - Bootheel 
BR - Branch 
BRG - Branching 
BRS - Branches 
BRF - Brief 
BRK - Break 
BRKG - Breaking 
BRKHIC - Breaks in higher clouds 
BRKS - Breaks 
BRKSHR - Berkshire 
BRKSHRS - Berkshires 
BRM - Barometer 
BS - Blowing snow 
BTWN - Between 
BYD - Beyond

C
C - Celsius 
CA - California 
CAA - Cold Air Advection 
CARIB - Caribbean 
CASCDS - Cascades 
CAVOK - Ceiling and visibility OK 
CAVU - Ceiling and visibility unlimited 
CB - Cumulonimbus 
CBS - Cumulonimbi 
CC - Cirrocumulus 
CCLDS - Clear of clouds 
CCLKWS - Counter-clockwise 
CCSL - Standing lenticular cirrocumulus 
CDFNT - Cold front 
CDFNTL - Cold frontal 
CFP - Cold front passage 
CG - Cloud-to-ground 
CHC - Chance 
CHCS - Chances 
CHG - Change 
CHGD - Changed 
CHGG - Changing 
CHGS - Changes 
CHSPK - Chesepeake 
CI - Cirrus 
CIG - Ceiling
CIGS - Ceilings 
CLD - Cloud 
CLDNS - Cloudiness 
CLDS - Clouds 
CLKWS - Clockwise 
CLR - Clear 
CLRG - Clearing 
CLRS - Clears 
CMPLX - Complex 
CNCL - Cancel 
CNCLD - Cancelled 
CNCLG - Cancelling 
CNCLS - Cancels 
CNDN - Canadian 
CNTR - Center 
CNTRD - Centered 
CNTRLN - Centerline 
CNTRS - Centers 
CNTRL - Central 
CNTY - County 
CNTYS - Counties 
CNVG - Converge 
CNVGG - Converging 
CNVGNC - Convergence 
CNVTN - Convection 
CNVTV - Convective 
CNVTVLY - Convectively 
CNFDC - Confidence 
CO - Colorado 
COMPAR - Compare 
COMPARG - Comparing 
COMPARD - Compared 
COMPARS - Compares 
COND - Conditions 
CONT - Continue 
CONTD - Continued 
CONTLY - Continually 
CONTG - Continuing 
CONTRAILS - Condensation Trails 
CONTS - Continues 
CONTDVD - Continental Divide 
CONUS - Continental U.S. 
COORD - Coordinate 
COR - Correction 
CPBL - Capable 
CRC - Circle 
CRCLC - Circulate 
CRCLN - Circulation 
CRNR - Corner 
CRNRS- Corners 
CRS- Course 
CS - Cirrostratus 
CSDR - Consider 
CSDRBL - Considerable 
CST - Coast 
CSTL - Coastal 
CT- Connecticut 
CTGY - Category 
CTSKLS - Catskills 
CU - Cumulus 
CUFRA - Cumulus Fractus 
CVR - Cover 
CVRD - Covered 
CVRG - Covering 
CVRS - Covers 
CYC - Cyclonic 
CYCLGN - Cyclogenesis

D
DABRK - Daybreak 
DALGT - Day light 
DBL - Double 
DC - District of Columbia 
DCR - Decrease 
DCRD - Decreased 
DCRG - Decreasing 
DCRGLY - Decreasingly 
DCRS - Decreases 
DE - Delaware 
DEG - Degree 
DEGS - Degrees 
DELMARVA - Delaware-Maryland-Virginia 
DFCLT - Difficult 
DFCLTY - Difficulty 
DFNT - Definite 
DFNTLY - Definitely 
DFRS - Differs 
DFUS - Diffuse 
DGNL - Diagonal 
DGNLLY - Diagonally 
DIGG - Digging 
DIR - Direction 
DISC - Discontinue 
DISCD - Discontinued 
DISCG - Discontinuing 
DISRE - Disregard 
DISRED - Disregarded 
DISREG - Disregarding 
DKTS - Dakotas 
DLA - Delay 
DLAD - Delayed 
DLT - Delete 
DLTD - Deleted 
DLTG - Deleting 
DLY - Daily 
DMG - Damage 
DMGD - Damaged 
DMGG - Damaging 
DMNT - Dominant 
DMSH - Diminish 
DMSHD - Diminished 
DMSHG - Diminishing 
DMSHS - Diminishes 
DNDFTS - Downdrafts 
DNS - Dense 
DNSLP - Downslope 
DNSTRM - Downstream 
DNWND - Down wind 
DP - Deep 
DPND - Deepened 
DPNS - Deepens 
DPR - Deeper 
DPNG - Deepening 
DPTH - Depth 
DRFT - Drift 
DRFTD - Drifted 
DRFTG - Drifting 
DRFTS - Drifts 
DRZL - Drizzle 
DSCNT - Descent 
DSIPT - Dissipate 
DSIPTD - Dissipated 
DSIPTG - Dissipating 
DSIPTN - Dissipation 
DSIPTS - Dissipates 
DSND - Descend 
DSNDG - Descending 
DSNDS - Descends 
DSNT - Distant 
DSTBLZ - Destabilize 
DSTBLZD - Destabilized 
DSTBLZG - Destablizing 
DSTBLZS - Destablizes 
DSTBLZN - Destablization 
DSTC - Distance 
DTRT - Deteriorate 
DTRTD - Deteriorated 
DTRTG - Deteriorating 
DTRTS - Deteriorates 
DURG - During 
DURN - Duration 
DVLP - Develop 
DVLPD - Developed 
DVLPG - Developing 
DVLPMT - Development 
DVLPS - Develops 
DVRG - Diverge 
DVRGG - Diverging 
DVRGNC - Divergence 
DVRGS - Diverges
DVV - Downward vertical velocity
DWNDFTS - Downdrafts 
DWPNT - Dewpoint 
DWPNTS - Dewpoints 
DX - Duplex 

E
E - East 
EBND - East bound 
EFCT - Effect 
ELNGT - Elongate 
ELNGTD - Elongated 
ELSW - Elsewhere 
EMBDD - Embedded 
EMERG - Emergency 
ENCTR - Encounter 
ENDG - Ending 
ENE - East-northeast 
ENELY - East-northeasterly 
ENERN - East-northeastern 
ENEWD - East-northeastward 
ENHNC - Enhance 
ENHNCD - Enhanced 
ENHNCG - Enhancing 
ENHNCS - Enhances 
ENHNCMNT - Enhancement 
ENTR - Entire 
ERN - Eastern 
ERY - Early 
ERYR - Earlier 
ESE - East-southeast 
ESELY - East-southeasterly 
ESERN - East-southeastern 
ESEWD - East-southeastward 
ESNTL - Essential 
ESTAB - Establish 
ESTS - Estimates 
ETA - Eta model 
ETC - Et cetera 
ETIM - Elapsed time 
EVE - Evening 
EWD - Eastward 
EXCLV - Exclusive 
EXCLVLY - Exclusively 
EXCP - Except 
EXPC - Expect 
EXPCD - Expected 
EXPCG - Expecting 
EXTD - Extend 
EXTDD - Extended 
EXTDG - Extending 
EXTDS - Extends 
EXTN - Extension 
EXTRAP - Extrapolate 
EXTRAPD - Extrapolated 
EXTRM - Extreme 
EXTRMLY - Extremely 
EXTSV - Extensive

F
F - Farenheit 
FA - Aviation area forecast 
FAH - Farenheit
FAM - Familiar 
FCST - Forecast 
FCSTD - Forecasted 
FCSTG - Forecasting 
FCSTR - Forecaster 
FCSTS - Forecasts 
FIG - Figure 
FILG - Filling 
FIRAV - First available 
FL - Florida 
FLG - Falling 
FLRY - Flurry 
FLRYS - Flurries 
FLT - Flight 
FLW - Follow 
FLWG - Following 
FM - From 
FMT - Format 
FNCTN - Function 
FNT - Front 
FNTL - Frontal 
FNTS - Fronts 
FNTGNS - Frontogenesis 
FNTLYS - Frontolysis 
FORNN - Forenoon 
FPM - Feet per minute 
FQT - Frequent 
FQTLY - Frequently 
FRM - Form 
FRMG - Forming
FRMN - Formation 
FROPA - Frontal passage 
FROSFC - Frontal surface 
FRST - Frost 
FRWF - Forecast wind factor 
FRZ - Freeze 
FRZN - Frozen 
FRZG - Freezing 
FT - Feet 
FT - Terminal forecast
FTHR - Further 
FVRBL - Favorable 
FWD - Forward 
FYI - For your information

G
G - Gust 
GA - Georgia 
GEN - General 
GENLY - Generally 
GEO - Geographic 

GEOREF - Geographical reference 
GF - Ground fog
GICG - Glaze icing 
GLFALSK - Gulf of Alaska 
GLFCAL - Gulf of California 
GLFMEX - Gulf of Mexico 
GLFSTLAWR - Gulf of St. Lawrence 
GND - Ground 
GNDFG - Ground fog 
GRAD - Gradient 
GRDL - Gradual
GRDLY - Gradually 
GRT - Great 
GRTLY - Greatly 
GRTR - Greater 
GRTST - Greatest 
GRTLKS - Great Lakes 
GSTS - Gusts 
GSTY - Gusty 
GV - Ground visibility

H
HAZ - Hazard 
HCVIS - High clouds visible 
HDFRZ - Hard freeze 
HDSVLY - Hudson Valley 
HDWND - Head wind 
HGT - Height 
HI - High 
HIER - Higher 
HIFOR - High level forecast 
HLF - Half 
HLTP - Hilltop 
HLSTO - Hailstones 
HLYR - Haze layer aloft 
HND - Hundred 
HR - Hour 
HRS - Hours 
HRZN - Horizon 
HTG - Heating 
HURCN - Hurricane 
HUREP - Hurricane report 
HV - Have 
HVY - Heavy 
HVYR - Heavier 
HVYST - Heaviest 
HWVR - However 
HWY - Highway

I
IA - Iowa 
IC - Ice 
ICG - Icing 
ICGIC - Icing in clouds 
ICGIP - Icing in precipitation 
ID - Idaho 
IL - Illinois 
IMDT - Immediate 
IMDTLY - Immediately 
IMPL - Impulse 
IMPLS - Impulses 
IMPT - Important 
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 
INLD - Inland 
INSTBY - Instability 
INTCNTL - Intercontinental 
INTL - International 
INTMD - Intermediate 
INTMT - Intermittent 
INTMTLY - Intermittently 
INTR - Interior 
INTRMTRGN - Intermountain region 
INTS - Intense 
INTSFCN - Intensification 
INTSFY - Intensify 
INTSFYD - Intensified 
INTSFYG - Intensifying 
INTSFYS - Intensifies 
INTSTY - Intensity 
INTVL - Interval 
INVRN - Inversion 
IOVC - In overcast 
INVOF - In vicinity of 
IP - Ice pellets 
IPV - Improve 
IPVG - Improving 
IR - Infrared 
ISOL - Isolate 
ISOLD - Isolated

J
JCTN - Junction 
JTSTR - Jet stream

K
KFRST - Killing frost 
KLYR - Smoke layer aloft 
KOCTY - Smoke over city 
KS - Kansas 
KT - Knots 
KY - Kentucky 

L
LA - Louisiana 
LABRDR - Labrador 
LAT - Latitude 
LCL - Local 
LCLY - Locally 
LCTD - Located 
LCTN - Location 
LCTMP - Little change in temperature 
LEVEL - Level 
LFM - Limited Fine Mesh Model 
LFTG - Lifting 
LGRNG - Long range 
LGT - Light 
LGTR - Lighter 
LGWV - Long wave 
LI - Lifted Index 
LIS - Lifted indices 
LK - Lake 
LKS - Lakes 
LKLY - Likely 
LLJ - Low Level Jet 
LLWS - Low Level Wind Shear 
LLWAS - Low level wind shear alert system 
LMTD - Limited 
LMTG - Limiting 
LMTS - Limits 
LN - Line 
LN - Lines 
LO - Low 
LONG - Longitude 
LONGL - Longitudnal 
LRG - Large 
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 - Leaving 
LVL - Level 
LVLS - Levels 
LWR - Lower 
LWRD - Lowered 
LWRG - Lowering 
LYR - Layer 
LYRD - Layered 
LYRS - Layers 

M
MA - Massachusetts 
MAN - Manitoba 
MAX - Maximum 
MB - Millibars 
MCD - Mesoscale discussion 
MD - Maryland 
MDFY - Modify 
MDFYD - Modified 
MDFYG - Modifying 
MDL - Model 
MDLS - Models 
MDT - Moderate 
MDTLY - Moderately 
ME - Maine 
MED - Medium 
MEGG - Merging 
MESO - Mesoscale 
MET - Meteorological 
METRO - Metropolitan 
MEX - Mexico 
MHKVLY - Mohawk Valley 
MI - Michigan 
MID - Middle 
MIDN - Midnight 
MIL - Military 
MIN - Minimum 
MISG - Missing 
MLTLVL - Melting level 
MN - Minnesota 
MNLND - Mainland 
MNLY - Mainly 
MO - Missouri 
MOGR - Moderate or greater 
MOV - Move 
MOVD - Moved 
MOVG - Moving 
MOVMT - Movement 
MOVS - Moves 
MPH - Miles per hour 
MRGL - Marginal 
MRGLLY - Marginally 
MRNG - Morning 
MRTM - Maritime 
MS - Mississippi 
MSG - Message 
MSL - Mean sea level 
MST - Most 
MSTLY - Mostly 
MSTR - Moisture 
MT - Montana 
MTN - Mountain 
MTNS - Mountains 
MULT - Multiple 
MULTILVL - Multi-level 
MXD - Mixed 

N
N - North 
NAB - Not above 
NAT - North Atlantic 
NATL - National 
NAV - Navigation 
NB - New Brunswick 
NBND - Northbound 
NBRHD - Neighborhood 
NC - North Carolina 
NCWX - No change in weather 
ND - North Dakota 
NE - Northeast 
NEB - Nebraska 
NEC - Necessary 
NEG - Negative 
NEGLY - Negatively 
NELY - Northeasterly 
NERN - Northeastern 
NEWD - Northeastward 
NEW ENG - New England 
NFLD - Newfoundland 
NGM - Nested Grid Model 
NGT - Night 
NH - New Hampshire 
NIL - None 
NJ - New Jersey 
NL - No layers 
NLT - Not later than 
NLY - Northerly 
NM - New Mexico 
NMBR - Number 
NMBRS - Numbers 
NMC - National Meteorological Center 
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 
NPRS - Nonpersistent 
NR - Near 
NRLY - Nearly 
NRN - Northern 
NRW - Narrow 
NS - Nova Scotia 
NTFY - Notify 
NTFYD - Notified 
NV - Nevada 
NVA - Negative vorticity advection 
NW - Northwest 
NWD - Northward 
NWLY - Northwesterly 
NWRN - Northwestern 
NWS - National Weather Service 
NY - New York 
NXT - Next 

O
OAT - Outside Air Temperature OBND - Outbound 
OBS - Observation 
OBSC - Obscure 
OBSCD - Obscured 
OBSCG - Obscuring 
OCFNT - Occluded front 
OCLD - Occlude 
OCLDS - Occludes 
OCLDD - Occluded 
OCLDG - Occluding 
OCLN - Occlusion 
OCNL - Occasional 
OCNLY - Occasionally 
OCR - Occur 
OCRD - Occurred 
OCRG - Occurring 
OCRS - Occurs 
OFC - Office 
OFP - Occluded frontal passage 
OFSHR - Offshore 
OH - Ohio 
OK - Oklahoma 
OMTNS - Over mountains 
ONSHR - On shore 
OR - Oregon 
ORGPHC - Orographic 
ORIG - Original 
OSV - Ocean station vessel 
OTLK - Outlook 
OTP - On top 
OTR - Other 
OTRW - Otherwise 
OUTFLO - Outflow 
OVC - Overcast 
OVNGT - Overnight 
OVR - Over 
OVRN - Overrun 
OVRNG - Overrunning 
OVTK - Overtake 
OVTKG - Overtaking 
OVTKS - Overtakes 

P
PA - Pennsylvania 
PAC - Pacific 
PBL - Planetary boundary layer 
PCPN - Precipitation 
PD - Period 
PDS - Periods 
PDMT - Predominant 
PEN - Peninsula 
PERM - Permanent 
PGTSND - Puget Sound 
PHYS - Physical 
PIBAL - Pilot balloon observation 
PIBALS - Pilot balloon reports 
PIREP - Pilot weather report 
PIREPS - Pilot weather reports 
PLNS - Plains 
PLS - Please 
PLTO - Plateau 
PM - Post meridian 
PNHDL - Panhandle 
POS - Positive 
POSLY - Positively 
PPINE - PPI no echoes 
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 
PRIM - Primary 
PRIN - Principal 
PRIND - Present indications are 
PRJMP - Pressure jump 
PROC - Procedure 
PROD - Produce 
PRODG - Producing 
PROG - Forecast 
PROGD - Forecasted 
PROGS - Forecasts 
PRSNT - Present 
PRSNTLY - Presently 
PRST - Persist 
PRSTS - Persists 
PRSTNC - Persistence 
PRSTNT - Persistent 
PRVD - Provide 
PRVDD - Provided 
PRVDG - Providing 
PRVDS - Provides 
PS - Plus 
PSBL - Possible 
PSBLY - Possibly 
PSBLTY - Possiblity 
PSG - Passage 
PSN - Position 
PSND - Positioned 
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 
PWR - Power 

Q
QN - Question 
QPFERD - NMC excessive rainfall discussion 
QPFHSD - NMC heavy snow discussion 
QPFSPD - NMC special precipitation discussion 
QSTNRY - Quasistationary 
QUAD - Quadrant 
QUE - Quebec