Weather Abbreviations
       
       

           
       
    


A	PREDEDING 4 DIGITS ALTIMETER (METAR)
AO1	AUTOMATED OBSERVATION WITHOUT PRECIPITATION DISCRIMINATOR
AO2	AUTOMATED OBSERVATION WITH PRECIPITATION DISCRIMINATOR
AAWF	AUXILIARY AVIATION WEATHER FACILITY
ACYC	ANTICYCLONIC
ADV	ADVISE
ADVCTN	ADVECTION
ADVY	ADVISORY
AFC	AREA FORECAST CENTER
AFDK	AFTER DARK
ALF	ALOFT
ALSEC	ALL SECTORS
ALQDS	ALL QUADRANTS
ALWF	ACTUAL WIND FACTOR
AMD 	AMENDED FORECAST (TAF)
AMS	AIR MASS
ANLYS	ANALYSIS
ASOS	AUTOMATED SURFACE OBSERVING SYSTEM
ATLC	ATLANTIC
AURBO	AURORA BOREALIS
AUTO	AUTOMATED (METAR) NO HUMAN INTERVENTION
AWOS	AUTOMATIC WEATHER OBSERVING/REPORTING SYSTEM
AWP	AVIATION WEATHER PROCESSORS

B	BEGINNING OF PRECIPITATION (TIME IN MINUTES) (WX REPORTS ONLY)
BCH	BEACH
BCKG	BACKING
BDA	BERMUDA
BECMG	BECOMING(EXPECTED BETWEEN 2 DIGIT BEGINNING HOUR AND 2 DIGIT ENDING HOUR)
BFDK	BEFORE DARK
BINOVC	BREAKS IN OVERCAST
BKN	BROKEN
BL	BETWEEN LAYERS
BL	BLOWING (METAR)
BLD	BUILD
BLDUP	BUILDUP
BLKT	BLANKET
BLO	BELOW (ICAO)
BLO	BELOW CLOUDS (METAR)
BLW	BELOW (ICAO)
BLZD	BLIZZARD
BMS	BASIC METEOROLOGICAL SERVICES
BNDRY	BOUNDARY
BOVC	BASE OF OVERCAST
BRF	BRIEF
BRK	BREAK
BRKHIC	BREAKS IN HIGHER OVERCAST
BRM	BAROMETER
BTL	BETWEEN LAYERS
BTWN	BETWEEN

C	CENTRAL STANDARD TIME (TIME GROUPS ONLY)
C	CONTINENTAL (AIR MASS)
CA	CLEAR ABOVE (PIREP ONLY)
CAN	CANADA
CARIB	CARIBBEAN
CASCDS	CASCADES
CAT	CLEAR AIR TURBULENCE (GENERAL)
CAVOK	CLOUD AND VISIBILITY OK (METAR)
CAVU	CLEAR OR SCATTERED CLOUDS AND VISIBILIY GREATER THAN TEN MILES
CAWS	COMMON AVIATION WEATHER SUB-SYSTEM
CCLKWS	COUNTERCLOCKWISE
CDFNT	COLD FRONT
CFP	COLD FRONT PASSAGE
CHARC	CHARACTERISTIC
CHC	CHANCE
CHSPK	CHESAPEAKE
CIG	CEILING
CLD	CLOUD
CLR	CLEAR AT OR BELOW 12,000 FEET (AWOS/ASOS/METAR)
CLR	CLEAR
CLRS	CLEAR AND SMOOTH
CNCL	CANCEL
CNDN	CANADIAN
CNVTV	CONVECTIVE
CONFDC	CONFIDENCE
CONT	CONTINUE OR CONTINUOUSLY (GEN)
CONTDVD	CONTINENTAL DIVIDE
COR	CORRECTION TO THE OBSERVATION
CST 	COAST
CTGY	CATEGORY
CTSKLS	CATSKILLS
CYC	CYCLONIC
CYCLGN	CYCLOGENESIS

DABRK	DAYBREAK
DCAVU	CLEAR/SCATTERED CLOUDS. VISIBILITY GREATER 
	THAN 10, REMAINDER OF REPORT MISSING
DKTS	DAKOTAS
DMSH	DIMINISH
DNS 	DENSE
DNSLP	DOWNSLOPE
DNSTRM	DOWNSTREAM
DPNG	DEEPENING
DPTH	DEPTH
DR	LOW DRIFTING (METAR)
DRFT	DRIFT
DRZL	DRIZZLE
DSIPT	DISSIPATE
DTLN	INTERNATIONAL DATELINE
DTRT	DETERIORATE
DURC	DURING CLIMB (PIREP)
DURD	DURING DECENT (PIREP)
DVV	DOWNWARD VERTICAL VELOCITY
DWNDRTS	DOWNDRAFTS
DWPNT	DEW POINT

E	EASTERN STANDARD TIME (TIME GROUPS ONLY)
E	ENDING OF PRECIPITATION (IN MINUTE-METAR)
E	EQUATORIAL (AIR MASS)
E	ESTIMATED (WEATHER REPORTS ONLY)
ELNGT	ELONGATE
EMBDD	EMBEDDED
EMSU	ENVIRONMENT METEOROLOGICAL SUPPORT UNIT
ENERN	EAST-NORTHEASTERN (WEATHER REPORTS ONLY)
ENEWD	EAST-NORTHEASTWARD (WEATHER REPORTS ONLY)
EOF	EXPECTED OPERATIONS FORECAST
ESERN	EAST-SOUTHEASTERN (WEATHER REPORTS ONLY)
ESEWD	EAST-SOUTHEASTWARD (WEATHER REPORTS ONLY)
EXTRAP	EXTRAPOLATE
EXTRM	EXTREME

FA	AREA FORECAST
FAH	FAHRENHEIT
FEW	1 OR 2 OCTAS (EIGHTHS) CLOUD COVERAGE
FIBI	FILED BUT IMPRACTICAL TO TRANSMIT
FILG	FILLING
FINO	WEATHER REPORT WILL NOT BE FILED FOR TRANSMISSION
/FL	ALTITUDE/FLIGHT LEVEL (PIREP)
FL	FLASH ADVISORY
FLDST	FLOOD STAGE
FLG	FALLING
FLWIS	FLOOD WARNING ISSUED
FM	FROM (4 DIGIT BEGINNING TIME IN HOURS AND MINUTES)
FNT	FRONT
FNTGNS	FRONTOGENESIS
FNTLYS	FRONTOLYSIS
FORNN	FORENOON
FRMG	FORMING
FROPA	FRONTAL PASSAGE
FROSFC	FRONTAL SURFACE
FRST	FROST
FRWF	FORECAST WIND FACTOR
FRZ	FREEZE
FRZLVL	FREEZING LEVEL
FRZN	FROZEN
FT	FEET (GEN)
FRQ	FREQUENT (ICAO)
FULYR	SMOKE LAYER ALOFT
FUOCTY	SMOKE OVER CITY
FWC	FLEET WEATHER CENTRAL

G	GUSTS REACHING (KNOTS) (WEATHER REPORTS ONLY)
GICG	GLAZE ICING
GLFALSK	GULF OF ALASKA
GLFCAL	GULF OF CALIFORNIA
GLFMEX	GULF OF MEXICO
GNDFG	GROUND FOG
GRAD	GRADIENT
GRBNKS	GRAND BANKS
GRDL	GRADUAL
GRTLKS	GREAT LAKES
GSTS	GUSTS
GSTY	GUSTY	
GV	GROUND VISIBILITY

HCVIS	HIGH CLOUDS VISIBLE
HDFRZ	HARD FREEZE
HDSVLY	HUDSON VALLEY
HI	HIGH
HIEAT	HIGHEST TEMPERATURE EQUALED FOR ALL TIME
HIEFM	HIGHEST TEMPERATURE EQUALED FOR THE MONTH
HIESE	HIGHEST TEMPERATURE EQUALED SO EARLY
HIESL	HIGHEST	TEMPERATURE EQUALED SO LATE
HIFOR	HIGH LEVEL FORECAST
HITMP	HIGHEST TEMPERATURE
HIXAT	HIGHEST TEMPERATURE EXCEEDED FOR ALL TIME
HIXFM	HIGHEST TEMPERATURE EXCEEDED FOR THE MONTH
HIXSE	HIGHEST TEMPERATURE EXCEEDED SO EARLY
HIXSL	HIGHEST TEMPERATURE EXCEEDED SO LATE
HLSTO	HAILSTONES
HLTP	HILLTOP
HLYR	HAZE LAYER ALOFT
HURCN	HURRICANE
HUREP	HURRICANE REPORT
HX	HIGH INDEX

/IC	ICING (PIREP ONLY)
ICG	ICING
ICGIC	ICING IN CLOUDS
ICGICIP	ICING IN CLOUDS AND PRECIPITATION
ICGIP	ICING IN PRECIPITATION
IMC	INSTRUMENT METEOROLOGICAL CONDITIONS
IMDT	IMMEDIATE
INLD	INLAND
INSTBY	INSTABILITY
INTR	INTERIOR
INTS	INTENSE
INTSFY	INTENSIFY
INVRN	INVERSION
IOVC	IN OVERCAST
IR	ICE ON RUNWAY
ISOLD	ISOLATED (GENERAL)

JTSTR	JET STREAM

K	COLD (AIR MASS)
KFRST	KILLING FROST
KT	KNOTS (FOLLOWS WIND DIRECTION/SPEED - GENERAL)

LABRDR	LABRADOR
LCTMP	LITTLE CHANGE IN TEMPERATURE
LDG	LANDING
LFT	LIFT
LGRNG	LONG RANGE
LGT	LIGHT (PIREP)
LIFR	LOW IFR (WEATHER REPORTS ONLY)
LK	LAKE
LLWS	LOW LEVEL WIND SHEAR (PIREP)
LN	LINE (GENERAL)
LOEAT	LOWEST TEMPERATURE EQUALED FOR ALL TIME
LOEFM	LOWEST TEMPERATURE EQUALED FOR THE MONTH
LOESE	LOWEST TEMPERATURE EQUALED SO EARLY
LOESL	LOWEST TEMPERATURE EQUALED SO LATE
LOTMP	LOWEST TEMPERATURE
LOXAT	LOWEST TEMPERATURE EXCEEDED FOR ALL TIME
LOXFM	LOWEST TEMPERATURE EXCEEDED FOR THE MONTH
LOXSE	LOWEST TEMPERATURE EXCEEDED SO EARLY
LOXSL	LOWEST TEMPERATURE EXCEEDED SO LATE
LSR	LOOSE SNOW ON RUNWAY
LTG	LIGHTNING
LTGCA	LIGHTNING CLOUD-TO-AIR
LTGCC	LIGHTNING CLOUD-TO-CLOUD
LTGCCCG LIGHTNING CLOUD-TO-CLOUD, CLOUD-TO-GROUND
LTGCG	LIGHTNING CLOUD-TO-GROUND
LTGCW	LIGHTNING CLOUD-TO-WATER
LTGIC	LIGHTNING IN CLOUDS
LTLCG	LITTLE CHANGE
LTNG	LIGHTNING
LX	LOW INDEX
LYR	LAYER OR LAYERED OR LAYERS

M	MARITIME (AIR MASS)
M	IN TEMPERATURE FIELD MEANS "MINUS" OR BELOW ZERO (METAR)
M	IN RVR LISTING INDICATES VISIBILITY LESS THAN LOWEST REPORTABLE SENSOR VALUE
M	MISSING (WEATHER REPORTS ONLY)
M	MOUNTAIN STANDARD TIME (TIME GROUPS ONLY)
MA	MAP ANALYSIS
MAN	MANITOBA
MEGG	MERGING
METAR	AVIATION ROUTINE WEATHER REPORT (ICAO)
MEX	MEXICO
MHKVLY	MOHAWK VALLEY
MI	SHALLOW (METAR)
MIDN	MIDNIGHT
MIFG	PATCHES OF SHALLOW FOG NOT DEEPER THAN TWO METERS (METAR)
MLTLVL	MELTING LEVEL
MMO	MAIN METEOROLOGICAL OFFICE
MNLD	MAINLAND
MOD	MODERATE (PIREP)
MOGR	MODERATE OR GREATER
MONTR	MONITOR
MOV	MOVE
MPS     METERS PER SECOND (1 MPS = 1.944 KTS)
MRGL	MARGINAL
MRNG	MORNING
MRTM	MARITIME
MS	MINUS
MSTLY	MOSTLY
MSTR	MOISTURE
MTN	MOUNTAIN
MVFR	MARGINAL VFR
MX	MIXED, ICING TYPE (PIREP)
MXD	MIXED

NB	NEW BRUNSWICK
NCWX	NO CHANGE IN WEATHER
NELY	NORTHEASTERLY (WEATHER REPORTS ONLY)
NERN	NORTHEASTERN
NEW ENG	NEW ENGLAND
NFLD	NEWFOUNDLAND
NGT	NIGHT
NL	NO LAYERS
NMBR	NUMBER
NNERN	NORTH-NORTHEASTERN (WEATHER REPORTS ONLY)
NNEWD	NORTH-NORTHEASTWARD (WEATHER REPORTS ONLY)
NNWRN	NORTH-NORTHWESTERN (WEATHER REPORTS ONLY)
NNWWD	NORTHWESTWARD (WEATHER REPORTS ONLY)
NO	NOT AVAILABLE (E.G. SLPNO, RVRNO)
NORPI	NO PILOT BALLOON OBSERVATION WILL BE FILED. NEXT COLLECTION
	UNLESS WEATHER CHANGES SIGNIFICANTLY
NOSPL	NO SPECIAL OBSERVATIONS TAKEN (WEATHER REPORTS ONLY)
NPRS	NONPERSISTENT
NS	NOVA SCOTIA
NSCSWD	NO SMALL CRAFT OR STORM WARNING ARE BEING DISPLAYED
NSW	NO SIGNIFICANT WEATHER (TAF)
NVA	NEGATIVE VORTICITY ADVECTION
NWLY	NORTHWESTERLY (WEATHER REPORTS ONLY)
NWRN	NORTHWESTERN (WEATHER REPORTS ONLY)

OBS	OBSERVATION
OBSC	OBSCURE
OCFNT	OCCLUDED FRONT
OCLD	OCCLUDE
OCLN	OCCLUSION
OCNL	OCCASIONAL (GENERAL)
OFP	OCCLUDED FRONTAL PASSAGE
OFSHR	OFFSHORE
OMTNS	OVER MOUNTAINS
ONSHR	ON SHORE
ONT	ONTARIO
ORGPHC	OROGRAPHIC
OSV	OCEAN STATION VESSEL
OTAS	ON TOP AND SMOOTH
OTLK	OUTLOOK
OTP	ON TOP (PIREP)
/OV	LOCATION (PIREP ONLY)
OVC	OVERCAST

P	IN RVR INDICATES VISIBILITY GREATER THAN HIGHEST REPORTABLE SENSOR VALUE E.G. P6000FT)
P	PACIFIC STANDARD TIME (TIME GROUP ONLY)
P	POLAR (AIR MASS)
P6SM	VISIBILITY GREATER THAN 6 SM  (TAF ONLY)
PAC	PACIFIC
PBL	PROBABLE
PCPN	PRECIPITATION
PDMT	PREDOMINANT
PDMT	PREDOMINATE
PDW	PRIORITY DELAYED WEATHER
PEN	PENINSULA
PGTSND	PUGET SOUND
PIBAL	PILOT BALLOON OBSERVATION
PISE	NO PILOT BALLOON OBSERVATION DUE TO UNFAVORABLE SEA CONDITIONS
PISO	NO PILOT BALLOON OBSERVATION DUE TO SNOW
PIWI	NO PILOT BALLOON OBSERVATION DUE TO HIGH, OR GUSTY, SURFACE WIND
PK WND	PEAK WIND
PLW	PLOW (SNOW)
PNHDL	PANHANDLE
PO	DUST/SAND WHIRLS (METAR)
PPINA	RADAR WEATHER REPORTS NOT AVAILABLE
PPINE	RADAR WEATHER REPORT NO ECHOES OBSERVED
PPINO	RADAR WEATHER REPORT EQUIPMENT INOPEERATIVE DUE TO BREAKSOWN
PPIOK	RADAR WEATHER REPORT EQUIPMENT OPERATION RESUMED
PPIOM	RADAR WEATHER REPORT EQUIPMENT INOPERATIVE DUE TO MAINTENANCE
PR	PARTIAL (METAR)
PRBLTY	PROBABILITY
PRESFR	PRESSURE FALLING RAPIDLY
PRESRR	PRESSURE RISING RAPIDLY
PRFG	FOG PARTIAL (METAR)
PRJMP	PRESSURE JUMP (WEATHER REPORTS ONLY)
PROB30	SLIGHT CHANCE, PROBABLILITY 30 PERCENT (TAF)
PROB40	PROBABILITY 40 PERCENT (TAF)
PROG	PROGNOSIS OR PROGNOSTIC
PRSNT	PRESENT
PS	PLUS
PSG	PASSAGE
PSG	PASSING
PSR	PACKED SNOW ON RUNWAY
PTCHY	PATCHY
PTLY	PARTLY
PVA	POSITIVE VORTICITY ADVECTION
PWINO	PRECIPITATION IDENTIFIER INFORMATION NOT AVAILABLE (WEATHER REPORTS ONLY)

R	RUNWAY	(USED IN RVR MEASUREMENT)
RABA	NO RAWIN OBSERVATION, NO BALLOOS AVAILABLE
RABAL	RADIOSONDE BALLOON WIND DATA
RABAR	RADIOSONDE BALLOON RELEASE
RACO	NO RAWIN OBSERVATION, COMMUNICATIONS OUT
RADAT	RADIOSONDE OBSERVATION DATA
RADNO	REPORT MISSING ACCOUNT RADIO FAILURE
RAFI	RADIOSONDE OBSERVATION NOT FILED
RAFRZ	RADIOSONDE OBSERVATION FREEZING LEVELS
RAHE	NO RAWIN OBSERVATION, NO GAS AVAILABLE
RAICG	RADIOSONDE OBSERVATION ICING AT
RAOB	RADIOSONDE OBSERVATION
RAPI	RADIOSONDE REPORT ALREADY SENT IN PIBAL COLLECTION
RAREP	RADAR WEATHER REPORT
RASN	RAIN AND SNOW (METAR)
RAVU	RADIOSONDE ANALYSIS AND VERIFICATION UNIT
RAWE	NO RAWIN OBSERVATION, UNFAVORABLE WEATHER
RAWI	NO RAWIN OBSERVATION, HIGH AND GUSTY WINDS
RAWIN	UPPER WINDS OBSERVATION (BY RADIO METHODS)
RCD	RADAR CLOUD DETECTION REPORT
RCDNA	RADAR CLOUD DETECTION REPORT NOT AVAILABLE
RCDNE	RADAR CLOUD DETECTION REPORT NO ECHOES OBSERVED
RCDNO	RADAR CLOUD DECTECTOR INOPERATIVE DUE TO BREAKDOWN UNTIL
RCDOM	RADAR CLOUD DETECTOR INOPERATIVE DUE TO MAINTENANCE UNTIL
RCKY	ROCKY (MOUNTAINS)
RDG	RIDGE
RDWND	RADAR DOME WIND
RESTR	RESTRICT
RGD	RAGGED
RH	RELATIVE HUMIDITY
RHINO	RADAR ECHO HEIGHT INFORMATION NOT AVAILABLE
RHINO	RADAR RANGE HEIGHT INDICATOR NOT OPERATING ON SCAN
RIOGD	RIO GRANDE
/RM 	REMARKS (PIREP)
RMK	REMARK
RNFL	RAINFALL
ROBEPS	RADAR OPERATING BELOW PRESCRIBED STANDARD
RPD	RAPID
RSG	RISING
RUF	ROUGH
RY/RWY	RUNWAY

SA	SAND (METAR)
SASK	SASKATCHEWAN
SBSD	SUBSIDE
SCT	SCATTERED
SELS	SEVERE LOCAL STORMS
SELY	SOUTHEASTERLY (WEATHER REPORTS ONLY)
SERN	SOUTHEASTERN (WEATHER REPORTS ONLY)
SEV	SEVERE (ICAO)
SFERICS	ATMOSPHERICS
SGD	SOLAR-GEOPHYSICAL DATA
SHFT	SHIFT (WEATHER REPORTS ONLY)
SHLW	SHALLOW
SHRTLY	SHORTLY
SIERNEV	SIERRA NEVADA
SIR	SNOW AND ICE ON RUNWAY
/SK	SKY CONDITIONS (PIREP ONLY)
SKC	SKY CLEAR
SLD	SOLID
SLP	SEA LEVEL PRESSURE
SLR	SLUSH ON RUNWAY
SLT	SLEET
SM	STATUTE MILE(S)
SMK	SMOKE
SMTH	SMOOTH
SNBNK	SNOWBANK
SNFLK	SNOWFLAKE
SNOINCR	SNOW DEPTH INCREASE IN PAST HOUR
SNW	SNOW
SNWFL	SNOWFALL
SP 	STATION PRESSURE
SPECI	SPECIAL REPORT
SPKL	SPRINKLE
SPLNS	SOUTH PLAINS
SPRD	SPREAD
SQ	SQUALL (METAR)
SQAL	SQUALL
SQLN	SQUALL LINE
SSERN	SOUTH-SOUTHEASTERN (WEATHER REPORTS ONLY)
SSEWD 	SOUTH-SOUTHEASTWARD (WEATHER REPORTS ONLY)
SSWRN	SOUTH-SOUTHWESTERN (WEATHER REPORTS ONLY)
SSWWD	SOUTH-SOUTHWESTWARD (WEATHER REPORTS ONLY)
STAGN	STAGNATION
STG	STRONG
STM	STORM
STNRY	STATIONARY
SWLG	SWELLING
SWLY 	SOUTHWESTERLY (WEATHER REPORTS ONLY)
SWRN	SOUTHWESTERN (WEATHER REPORTS ONLY)
SX	STABILITY INDEX
SXN	SECTION
SYNOP	SYNOPTIC
SYNS	SYNOPSIS

T	TRACE (WEATHER REPORTS ONLY)
T	TROPICAL (AIR MASS)
/TA	AIR TEMPERATURE (PIREP)
TAF	AVIATION TERMINAL FORECAST
/TB	TURBULENCE (PIREPS ONLY)
TCU	TOWERING CUMULUS
TEMPO	TEMPORARY CHANGES EXPECTED
THD	THUNDERHEAD (NON METAR)
THDR	THUNDER (NON METAR)
THK	THICK
THN	THIN
TKOF	TAKEOFF
/TM	TIME (PIREP)
TOP	CLOUD TOP
TOVC	TOP OF OVERCAST
/TP	TYPE AIRCRAFT (PIREP ONLY)
TPG	TOPPING
TRIB	TRIBUTARY
TROF	TROUGH
TROP	TROPOPAUSE
TRPCD	TROPICAL CONTINENTAL (AIR MASS)
TRPCL	TROPICAL
TRPLYR	TRAPPING LAYER
TS	THUNDERSTORM
TSNO	THUNDERSTORM Information not available
TSHWR	THUNDERSHOWER (NON METAR)
TSQLS	THUNDERSQUALLS (NON METAR)
TSTM	THUNDERSTORM (NON METAR)
TURBC	TURBULENCE
TURBT	TURBLENT
TWRG	TOWERING

UA	ROUTINE PIREP
UAG	UPPER ATMOSPHERE GEOPHYSICS
UDDF	UP AND DOWN DRAFTS
UNSBL	UNSEASONABLE
UNSTBL	UNSTABLE
UNSTDY	UNSTEADY
UNSTL	UNSETTLE
UP	UNKNOWN PRECIPITATION (AUTOMATED OBSERVATIONS)
UPDFTS	UPDRAFTS
UPR	UPPER
UPSLP	UPSLOPE
UPSTRM	UPSTREAM
UUA	URGENT PIREP
UVV	UPWARD VERTICAL VELOCITY
UWNDS	UPPER WINDS

V	VARIES (WINDS DIRECTION AND RVR)
V	VARIABLE (WEATHER REPORTS ONLY)
VA	VOLCANIC ASH (METAR)
VC	VICINITY
VCFG	FOG IN VICINITY (METAR)
VIS	VISIBILITY (GENERAL)
VLCTY	VELOCITY
VLNT	VIOLENT
VLY	VALLEY
VR	VEER
VRB	VARIABLE WIND DIRECTION WHEN SPEED IS LESS THAN OR EQUAL TO 6 KNOTS
VRISL	VANCOUVER ISLAND, BC
VSBY	VISIBILITY
VSBYDR	VISIBILITY DECREASING RAPIDLY
VSBYIR	VISIBILITY INCREASING RAPIDLY
VV	VERTICAL VISBILITY  (INDEFINITE CEILING)

W	WARM (AIR MASS)
WA	AIRMET
WDC-1	WORLD DATA CENTERS IN WESTERN EUROPE
WDC-2	WORLD DATA CENTERS THROUGHOUT REST OF WORLD
WDLY	WIDELY
WDSPRD	WIDESPREAD
WEA	WEATHER
WFP	WARM FRONT PASSAGE
WINT	WINTER
WND	WIND
WNWRN	WEST-NORTHWESTERN (WEATHER REPORTS ONLY)
WNWWD	WEST-NORTHWESTWARD (WEATHER REPORTS ONLY)
WPLTO	WESTERN PLATEAU
WR	WET RUNWAY
WRM	WARM
WRMFNT	WARM FRONT
WRNG	WARNING
WS	WIND SHEAR (IN TAFs, LOW LEVEL AND NOT ASSOCIATED WITH CONVECTIVE ACTIVITY)
WS	SIGMET
WSHFT	WIND SHIFT
WSOM	WEATHER SERVICE OPERATIONS MANUAL
WSR	WET SNOW ON RUNWAY
WSTCH	WATCH RANGE
WSWRN	WEST-SOUTHWESTERN (WEATHER REPORTS ONLY)
WSWWD	WEST-SOUTHWESTWARD (WEATHER REPORTS ONLY)
WTR	WATER
WTSPT	WATERSPOUT
WV	WAVE
/WV	WIND AT ALTITUDE ONLY (PIREP ONLY)
WW	SEVERE WEATHER FORECAST
/WX	FLIGHT VISIBILITY AND FLIGHT WEATHER (PIREP)
WXCON	WEATHER RECONNAISSANCE FLIGHT PILOT REPORT

XCP	EXCEPT
XPC	EXPECT

Y	YUKON STANDARD TIME (TIME GROUPS ONLY)
YKN	YUKON
YLSTN	YELLOWSTONE

Z	APPENDED DATE-TIME GROUPE INDICATES UTC (METAR/TAF)
ZI	ZONAL INDEX
ZI	ZONE OF INTERIOR
ZRNO	FREEZING RAIN INFORMATION NOT AVAILABLE (WEATHER REPORTS ONLY)



Weather Descriptions
 

BC	PATCHES
BCFG	PATCHY FOG (METAR)
BL	BLOWING
DS 	DUST STORM
DR	LOW DRIFTING
DU	WIDESPREAD DUST (METAR)
FZ	SUPERCOOLED/FREEZING
MI	SHALLOW	
PR	PARTIAL
SH	SHOWERS
TS	THUNDERSTORM



Weather Phenomena
 

BL	BLOWING (METAR)
BLDU	BLOWING DUST (METAR)
BLSA	BLOWING SAND (METAR)
BLSN	BLOWING SNOW (METAR)
BR	MIST
BY	BLOWING SPRAY (METAR) (WEATHER REPORTS ONLY)
DRSA	LOW DRIFTING SAND (METAR)
DRSN	LOW DRIFTING SNOW (METAR)
DS	DUST STORM
DU	WIDESPREAD DUST
DZ	DRIZZLE
FC	FUNNEL CLOUD
+FC	TORNADO/WATER SPOUT
FG	FOG
FRST	FROST
FU	SMOKE
FZDZ	FREEZING DRIZZLE (METAR)
FZFG	FREEZING FOG (METAR)
FZRA	FREEZING RAIN (METAR)
GR	HAIL  (GREATER THAN 1/4" - METAR)
GS	SMALL HAIL/SNOW PELLETS (LESS THAN 1/4" - METAR)
HZ	HAZE
IC 	ICE CRYSTALS
PE	ICE PELLETS
PL	ICE PELLETS
PO	DUST/SAND WHIRLS
PRFG	FOG PARTIAL (METAR)
PY	SPRAY
RA	RAIN
RASN	RAIN AND SNOW (METAR)
SA	SAND
SG	SNOW GRAINS
SH	SHOWERS
SHGR	HAIL SHOWERS
SHGS	SMALL HAIL SHOWERS
SHRA	RAIN SHOWERS
SHSN	SNOW SHOWERS
SHWR	SHOWER
SKC 	SKY CLEAR (METAR)
SKC	CLEAR
SN	SNOW
SQ	SQUALL
SS	SANDSTORM
TS 	THUNDERSTORM
TSGR	THUNDERSTORM WITH HAIL (METAR)
TSGS	THUNDERSTORM WITH SMALL HAIL (METAR)
TSPL	THUNDERSTORM WITH ICE PELLETS
TSRA	THUNDERSTORM WITH RAIN (METAR)
TSSA	THUNDERSTORM WITH DUSTSTORM OR SANDSTORM (METAR)
TSSN	THUNDERSTORM WITH SNOW (METAR)
UP	UNKNOWN PRECIPITATION  (AUTOMATED OBSERVATIONS)
VA	VOLCANIC ASH
VCFG	FOG IN VICINITY (METAR)
VV 	VERTICAL VISIBILITY (METAR)



Cloud Types
 

AC	ALTOCUMULUS
ACC	ALTOCUMULUS CASTELLANUS (ICAO)
ACCAS	ALTOCUMULUS CASTELLANUS
ACSL	STANDING LENTICULAR ALTOCUMULUS
AS 	ALTOSTRATUS
CB	CUMULONIMBUS
CBMAM	CUMULONIMBUS MAMMATUS
CC	CIRROCUMULUS
CCSL	STANDING LENTICULAR CIRROCUMULUS
CI	CIRRUS
CS 	CIRROSTRATUS
CU	CUMULUS
CUFRA	CUMULUS FRACTUS
NS	NIMBOSTRATUS
SC	STRATOCUMULUS
SCSL	STANDING LENTICULAR STRATOCUMULUS
ST	STRATIS
STFRA	STRATUS FRACTUS
STFRM	STRATIFORM
TCU	TOWERING CUMULUS



Other Abbreviations
 

A/A		AIR TO AIR
AFF		ARMY AIR FIELD
AAL  		ABOVE AERODROME LEVEL
AAS 		AIRPORT ADVISORY SERVICE
AB		AIR BASE
ABM		ABEAM
ABN		AIRPORT BEACON
ABV		ABOVE
AC		AIR CARRIER
ACA 		ARTIC CONTROL AREA
ACAS		AIRBORNE COLLISION AVOIDANCE SYSTEM
ACARS		AIRBORNE COMMUNICATIONS ADDRESSING AND REPORTING SYSTEM
ACC		AREA CONTROL CENTER
ACCUM		ACCUMULATE
ACFT		AIRCRAFT
ACN		AIRCRAFT CLASSIFICATION NUMBER
ACR		AIR CARRIER
AD		AERODROME
ADA		ADVISORY AREA
ADF		AUTOMATIC DIRECTION FINDING
ADJ		ADJACENT
ADIZ		AIR DEFENSE IDENTIFICATION ZONE
ADR		ADVISORY ROUTE
ADV		ADVISORY AREA
ADZD		ADVISED
AEIS		AERONAUTICAL ENROUTE INFORMATION SERVICE
AER		APPROACH END RUNWAY
AERADIO		AIR RADIO
AERO		AERODROME
AFB		AIR FORCE BASE
AFIS		AIRPORT FLIGHT INFORMATION SERVICE
AFN		AMERICAN FORCES NETWORK
AFRS		ARMED FORCES RADIO STATIONS
AFS		AIR FORCE STATION
AFSS		AUTOMATED FLIGHT SERVICE STATION
A/G		AIR-TO-GROUND
AGL		ABOVE GROUND LEVEL
AH		ALERT HEIGHT
AIREP		AIR-REPORT
ALA		AUTHORIZED LANDING AREA
ALF		AUXILLARY LANDING FIELD
ALS 		APPROACH LIGHT SYSTEM
ALSTG		ALTIMETER SETTING
ALT		ALTITUDE
ALTM		ALTIMETER
ALTN		ALTERNATE
ALTNLY		ALTERNATELY
AMA		AREA MINIMUM ALTITUDE
AMDT		AMENDMENT
AMGR		AIRPORT MANAGER
AMOS		AUTOMATIC METEOROLOGICAL OBSERVING SYSTEM
AMSL		ABOVE MEAN SEA LEVEL
ANGB		AIR NATIONAL GUARD BASE
AOE		AIRPORT OF ENTRY
AP		AIRPORT
APAPI		ABBREVIATED PRECISION APPROACH PATH INDICATOR
APC		AREA POSITIVE CONTROL
APCH		APPROACH
AP LGT		AIRPORT LIGHTS
APP		APPROACH CONTROL
APT		AIRPORT
ARB		AIR RESERVE BASE
ARFF		AIRCRAFT RESCUE & FIRE FIGHTING
ARINC		AERONAUTICAL RADIO, INC.
ARO		AIRPORT REPORTING OFFICER
ARR		ARRIVAL
ARTCC		AIR ROUTE TRAFFIC CONTROL CENTER
ASDA 		ACCELERATE STOP DISTANCE AVAILABLE
ASOS		AUTOMATED SERFACE OBSERVATION SYSTEM
ASPH		ASPHALT
ASR		AIRPORT SURVEILLANCE RADAR
ATA		ACTUAL TIME OF ARRIVAL
ATC		AIR TRAFFIC CONTROL
ATCAA		AIR TRAFFIC CONTROL ASSIGNED AIRSPACE
ATCC		AIR TRAFFIC CONTROL CENTER
ATCSCC		AIR TRAFFIC CONTROL SYSTEM COMMAND CENTER
ATCT		AIR TRAFFIC CONTROL TOWER
ATD		ACTUAL TIME OF DEPARTURE
ATF		AIRPORT TRAFFIC FREQUENCY
ATFM		AIR TRAFFIC FLOW MANAGEMENT
ATIS		AUTOMATIC TERMINAL INFORMATION SERVICE
ATS		AIR TRAFFIC SERVICE
ATZ		AIRPORT TRAFFIC ZONE
AUTH		AUTHORIZED
AUTOB		AUTOMATIC WEATHER REPORTING SYSTEM
AUW		ALL-UP WEIGHT
AUX		AUXILARY
AVBL		AVAIABLE
AWIB		AIRPORT WEATHER INFORMATION BROADCAST
AWOS		AUTOMATED WEATHER OBSERVING SYSTEM
AWY		AIRWAY
AZM		AZIMUTH


BA FAIR		BRAKING ACTION FAIR
BA NIL		BRAKING ACTION NIL
BA POOR		BRAKING ACTION POOR
BC		BACK COURSE
BCM		BACK COURSE MARKER
BCN		BEACON
BCOB		BROKEN CLOUDS OR BETTER
BCST		BROADCAST
BDRY		BOUNDARY
BERM		SNOWBANK/S CONTAINING EARTH/GRAVEL
BLDG		BUILDING
BLW		BELOW
BM		BACK MARKER
BND		BOUND
BRG		BEARING
BYD		BEYOND

C		ATC IFR FLIGHT PLAN CLEARNCE DELIVERY FREQUENCY
CAAS		CLASS A AIRSPACE
CADIZ		CANADIAN AIR DEFENSE IDENTIFICATION ZONE
CARS		COMMUNITY AIRPORT RADIO STATION
CAT		CATEGORY
CBAS		CLASS B AIRSPACE
CBSA		CLASS B SURFACE AREA
CCAS		CLASS C AIRSPACE
CCLKWS		COUNTERCLOCKWISE
CCSA		CLASS C SURFACE AREA
CD		CLEARANCE DELIVERY
CDAS		CLASS D AIRSPACE
CDSA		CLASS D SURFACE AREA
CDI		COURSE DEVIATION INDICATOR
CDT		CENTRAL DAYLIGHT TIME
CEAS		CLASS E AIRSPACE
CESA		CLASS E SURFACE AREA
CEIL		CEILING
CFR		CODE OF FEDERAL REGULATIONS
CGAS		CLASS G AIRSPACE
CGL		CIRCLING GUIDANCE LIGHTS
CH		CHANNEL
CH		CRITICAL HEIGHT
CHAN		CHANNEL
CHG		CHANGE OR MODIFICATION
CIG		CEILING
CK		CHECK
CL		CENTERLINE
CLKWS		CLOCKWISE
CLR		CLEARANCE, CLEAR(S), CLEARED TO
CLSD		CLOSED
CMB		CLIMB
CMNPS		CANADIAN MINIMUM NAVIGATION PERFORMANCE SPECIFICATION
CMSND		COMMISSIONED
CNF		COMPUTER NAVIGATION FIX
CNL		CANCEL
CNTRLN		CENTERLINE
CO		COUNTY
COMLO		COMPASS LOCATOR
COM		COMMUNICATIONS
COMM		COMMUNICATIONS
CONC		CONCRETE
CONT		CONTINUOUS
COORD		COORDINATES
COP		CHANGE OVER POINT
CORR		CORRIDOR
CP		COMMAND POST
CPD		COUPLED
CPT		CLEARANCE-PRE-TAXI PROCEDURE
CRP		COMPULSORY REPORTING POINT
CRS		COURSE
CST		CENTRAL STANDARD TIME
CTA		CONTROL AREA
CTAF		COMMONTRAFFIC ADVISORY FREQUENCY
CTC		CONTACT
CTL		CONTROL
CTR		CONTROL ZONE
CVFR		CONTROLLED VFR


D		DAY
DA		DECISION ALTITUDE
DALGT		DAYLIGHT
D-ATIS		DIGITAL ATIS
DCT		DIRECT
DECMSND		DECOMMISSIONED
DEG		DEGREE
DEGS		DEGREES
DEP		DEPARTURE CONTROL
DEP PROC	DEPARTURE PROCEDURE
DER		DEPARTURE END OF RUNWAY
DEWIZ		DISTANCE EARLY WARNING IDENTIFICATION ZONE
DH		DECISION HEIGHT
DISABLD		DISABLED
DISPL THRESH	DISPLACED THRESHOLD
DIST		DISTANCE
DLA		DELAY OR DELAYED
DLT		DELETE
DLY		DAILY
DME		DISTANCE-MEASURING EQUIPMENT
DMSTN		DEMONSTRAITION
DOD		DEPT OF DEFENSE
DOM		DOMESTIC
DP		DEPARTURE PROCEDURE
DRFT		SNOWBANK/S CAUSED BY WIND ACTION
DSPLCD		DISPLACED

E		EAST
EAT		EXPECTED APPROACH TIME
EB		EASTBOUND
EDT		EASTERN DAYLIGHT TIME
EET		ESTIMATED ELAPSED TIME
EFAS		ENROUTE FLGIGHT ADVISORY SERVICE
EFF		EFFECTIVE
ELEV		ELEVATION
EMERG		EMERGENCY
ENG		ENGINE
ENRT		EN ROUTE
ENTR		ENTIRE
EOBT		ESTIMATED OFF BLOCK TIME
EST		EASTERN STANDARD TIME
ETA		ESTIMATED TIME OF ARRIVAL
ETD		ESTIMATED TIME OF DEPARTURE
ETE		ESTIMATED TIME ENROUTE
ETOPS		EXTENDED RANGE OPERATION WITH TWO ENGINE AIRPLANES
EXC		EXCEPT


FAA		FEDERAL AVIATION ADMINISTRATION
FAC		FACILITY OR FACILITIES
FAF		FINAL APPROACH FIX
FAN MKR		FAN MARKER
FAP		FINAL APPROACH POINT
FAR		FEDERAL AVIAITON REGULATION
FCP		FINAL CONTROL POINT
FDC		FLIGHT DATA CENTER
FIC		FLIGHT INFORMATION CENTER
FIR		FLIGHT INFORMATION REGION
FIS		FLIGHT INFORMATION SERVICE
FI/T		FLIGHT INSPECTION TEMPORARY
FI/P		FLIGHT INSPECTION PERMANENT
FL		FLIGHT LEVEL	
FL		Flight Level or altitude (PIREP)
/FL		Flight Level or altitude (PIREP)
FLD 		FIELD
FLG		FLASHING
FLT		FLIGHT
FLUNKN		Flight Level(PIREP)Unknown
FM		FAN MARKER
FM 		FROM (NOTAM CONTRACTION)
FMS		FLIGHT MANAGEMENT SYSTEM
FNA		FINAL APPROACH
FPM		FEET PER MINUTE
FREQ		FREQUENCY
FRH		FLY RUNWAY HEADING
FRI		FRIDAY
FRZN		FROZEN
FSS		FLIGHT SERVICE STATION
FT		FEET
FTS		FLEXIBLE TRACK SYSTEM

GA		GENERAL AVIATION
GC		GROUND CONTROL
GCA		GROUND CONTROLLED APPROACH
GCO		GROUND COMMUNICATION OUTLET
GLONASS		GLOBAL ORBITING NAVIGATION SATELLITE SYSTEM
GMT		GREENWICH MEAN TIME
GND		GROUND CONTROL
GND		GROUND LEVEL
GNSS		GLOBAL NAVIGATION SATELLITE SYSTEM
GOVT		GOVERNMENT
GP		GLIDEPATH
GPS		GLOBAL POSITIONING SYSTEM
GRVL		GRAVEL
GS		GLIDE SLOPE
G/S		GROUND SPEED
GWT		GROSS WEIGHT



H24		24 HOUR SERVICE
HAA		HEIGHT ABOVE AIRPORT
HAS		HEIGHT ABOVE SITE
HAT		HEIGHT ABOVE TOUCHDOWN
HC		CRITICAL HEIGHT
HDG		HEADING
HEL		HELICOPTER
HELI		HELIPORT
HF		HIGHT FREQUENCY
HI		HIGHT ALTITUDE
HI		HIGH INTENSITY
HIALS		HIGH INTENSITY APPROACH LIGHT SYSTEM
HIRL		HIGH INTENSITY RUNWAY EDGE LIGHTS
HIWAS		HAZARDOUS INFLIGHT WEATHER ADVISORY SERVICE
HJ		SUNRISE TO SUNSET
HLDG		HOLDING
HN		SUNSET TO SUNRISE
HO		BY OPERATIONAL REQUIREMENTS
HOL		HOLIDAY
HP		HOLDING PATTERN
HR		HOUR
HS		DURING HOURS OF SCHEDULED OPERATIONS
HST		HIGH SPEED TAXIWAY TURN OFF
HZ		HERTZ

I		ISLAND
IAF		INITIAL APPROACH FIX
IAP		INSTRUMENT APPROACH PROCEDURE
IAS		INDICATED AIRSPEED
IBN		IDENTIFICATION BEACON
IC		Icing (PIREP)
/IC		Icing (PIREP)
ICAO		INTERNATIONAL CIVIL AVIATION ORGANIZATION
ID		IDENTIFICATION
IDENT		IDENTIFICATION
IF 		INTERMEDIATE FIX
IFR		INSTRUMENT FLIGHT RULES
IGS		INSTRUMENT GUIDANCE SYSTEM
ILS		INSTRUMENT LANDING SYSTEM
IM		INNER MARKER
IMC		INSTRUMENT METEOROLOGICAL CONDITIONS
IMTA		INTENSIVE MILITARY TRAING AREA
INDEFLY		INDEFINITELY
IN		INCHES
INBD		INBOUND
INS		INCHES
INFO		INFORMATION
INOP		INOPERATIVE
INS		INERTIAL NAVIGATION SYSTEM
INSTR		INSTRUMENT
INT		INTERSECTION
INTL		INTERNATIONAL
INSTS		INTENSITY
INVOF		IN VICINITY OF
IORRA		INDIAN OCEAN RANDOM RNAV AREA 
IR		ICE ON RUNWAY/S  (NOTAM CONTRACTION)
IR		INSTRUMENT RESTRICTED CONTROLLED AIRSPACE
IS		ISLANDS
ITWS		INTEGRATED TERMINAL WEATHER SYSTEM
I/V		INSTRUMENT/VISUAL CONTROLLED AIRSPACE


JAA		JOINT AVIATION AUTHORITIES

KGS		KILOGRAMS
KHZ		KILOHERTZ
KIAS		KNOTS INDICATED AIRSPEED
KM		KILOMETERS
KMH		KILOMTERS PER HOUR
KT		KNOTS
KTAS		KNOTS TRUE AIRSPEED
KTS		Knots (PIREP)

L		LOCATOR
L		LEFT (NOTAM CONTRACTION)
LAA		LOCAL AIRPORT ADVISORY
LACFT		LARGE AIRCRAFT
LAHSO		LAND AND HOLD SHORT OPERATIONS
LAT		LATITUDE
LAWRS		LIMITED AVIATION WEATHER REPORTING STATION
LB		POUND/POUNDS
LBCM		LOCATOR BACK COURSE MARKER
LBM		LOCATOR BACK MARKER
LBS	        POUNDS
LC		LOCAL CONTROL
LCG		LOAD CLASSIFICATION GROUP
LCN		LOAD CLASSIFICATION NUMBER
LCTD		LOCATED
LCTR		LOCATOR
LDA		LANDING DISTANCE AVAILABLE
LDA		LOCALIZER TYPE DIRECTIONAL AID
LDI		LANDING DIRECTION INDICATOR
LDIN		LEAD IN LIGHT SYSTEM
LGT		LIGHT OR LIGHTING
LGTH		LENGTH
LIM		LOCATOR INNER MARKER
LIRL		LOW INTENSITY RUNWAY LIGHTS
LLWAS		LOW LEVEL WIND SHEAR ALERT SYSTEM
LM		COMPASS LOCATOR AT ILS OUTER MARKER
LMM		LOCATOR MIDDLE MARKER
LNDG		LANDING
LO		LOCATOR AT OUTER MARKER SITE
LOC		LOCALIZER
LOM		LOCATOR OUT MARKER
LONG		LONGITUDE
LRN		LORAN
LSALT		LOWEST SAFE ALTITUDE
LSR		LOOSE SNOW ON RUNWAY/S
LT		LEFT TURN  (NOTAM CONTRACTION)
LT		LOCAL TIME
LTS		LIGHTS


M		METERS
MAA		MAXIMUM AUTHORIZED ALTITUDE
MAG		MAGNETIC
MAINT		MAINTAIN, MAINTENANCE
MALS		MED INTENSITY APPROACH LIGHT SYSTEM
MALSF		MEDIUM INTENSITY APPROACH LIGHT SYSTEM WITH SEQUENCED FLASHING LIGHTS
MALSR		MEDIUM INTENSITY APPROACH LIGHT SYSTEM WITH RUNWAY ALIGNMENT INDICATOR LIGHTS
MAP		MISSED APPROACH POINT
MAPT		MISSED APPROACH POINT
MAX		MAXIMUM
MB		MILLIBARS
MBZ		MANDATORY BROADCAST ZONE
MCA		MINIMUM CROSSING ALTITUDE
MCAF		MARINE CORPS AIR FACILITY
MCTA		MILITARY CONTROLLED AIRPSACE
MDA		MINIMUM DESCENT ALTITUDE
MDT		MOUNTAIN DAYLIGHT TIME
MEA		MINIMUM ENROUTE ALTITUDE
MED		MEDIUM
MEHT		MINIMUM EYE HEIGHT OVER THRESHOLD
MEML		MEMORIAL
MET		METEOROLOGICAL
MHA		MINIMUM HOLDING ALTITUDE
MHZ		MEGAHERTZ
MI		MEDIUM INENSITY
MIALS		MEDIUM INTENSITY APPROACH LIGHT SYSTEM
MIL		MILITARY
MIM		MINIMUM
MIN		MINUTE
MIRL		MEDIUM INTENSITY RUNWAY EDGE LIGHTS
MKR		MARKER RADIO BEACON
MLS		 MICROWAVE LANDING SYSTEM
MM		MIDDLE MARKER
MNM		MINIMUM
MNPS		MINIMUM NAVIGATION PERFORMANCE SPECIFICATIONS
MNT		MONITOR/MONITORING/MONITORED
MOA		MILITARY OPERATION AREA
MOC		MINIMUM OBSTRUCTION CLEARANCE
MOCA		MINIMUM OBSTRUCTION CLEARANCE ALTITUDE	
MON		MONDAY
MORA		MINIMU OFF ROUTE ALTITUDE
MPS             METERS PER SECOND (1 MPS = 1.944 KTS)
MRA		MINIMUM RCEPTION ALTITUDE
MSA		MINIMUM SAFE ALTITUDE
MSAW		MINIMUM SAFE ALTITUDE WARNING
MSG		MESSAGE
MSL		MEAN SEA LEVEL
MST		MOUNTAIN STANDARD TIME
MTA		MILITARY TRAIN AREA
MTAF		MANDATORY TRAFFIC ADVISORY FREQUENCY
MTCA		MINIMUM TERRAIN CLEARANCE ALTITUDE
MTMA		MILITARY TERMINAL CONTROL AREA
MTOW		MAXIMUM TAKE OFF WEIGHT
MU		MU METERS
MUD		MUD
MUN		MUNICIPAL
MUNI		MUNICIPAL
MVA		MINIMUM VECTORING ALTITUDE


N		NIGHT
N		NORTH
NA		NOT AUTHORIZED
NAAS		NAVAL AUXILIARY AIR STATION
NAR		NORTH AMERICAN ROUTES
NAS		NAVAL AIR STATION
NAT		NORTH ATLANTIC TRAFFIC
NAT/OTS		NORTH ATLANTIC TRAFFIC/ORGANIZED TRACK SYSTEM
NATL		NATIONAL
NAV		NAVIGATION
NAVAID		NAVIGATIONAL AID
NB		NORTHBOUND
NCA		NORTHERN CONTROL AREA
NCRP		NON COMPULSORY REPORTING POINT
NDB		NON DIRECTIONAL BEACON
NE		NORTHEAST
NEG		Negative (PIREP)	
NGT		NIGHT
NM		NAUTICAL MILE
NMR		NAUTICAL MILE RADIUS
NONSTD		NONSTANDARD
NOPT		NO PROCEDURE TURN
NOTAM		NOTICES TO AIRMEN
NR		NUMBER
NTAP		NOTICE TO AIRMEN PUBLICATION
NW		NORTHWEST
NWC		NAVAL WEAPONS CENTER

O/A		ON OR ABOUT
OAC		OCEANIC AREA CONTROL
OBSC		OBSCURED, OBSCURE, OBSCURING
OBST		OBSTRUCTION, OBSTACLE
OCA		OCEANIC CONTROL AREA
OCA		OBSTACLE CLEARANCE ALTITUDE
OCC		Occasional (PIREP)
OCL		OBSTRUCTION CLEARANCE LIMIT
OCNL		OCCASIONAL
OCTA		OCEANIC CONTROL AREA
ODALS		OMNI DIRECTIONAL APPROACH LIGHT SYSTEM
OM		OUTER MARKER
OPR		OPERATE, OPERATOR OR OPERATIVE
OPS		OPERATIONS
ORIG		ORIGINAL
O/R		ON REQUEST
O/T		OTHER TIMES
OTR		OCEANIC TRANSITIONS ROUTES
OTS		OUT OF SERVICE
OV              OVER (Location of PIREP) 
/OV             OVER (Location of PIREP) 
OVR		OVER


PAEW		PERSONNEL AND EQUIPMENT WORKING
PAPI		PRECISION APPROACH PATH INDICATOR
PAR		PRECISION APPROACH RADAR
PARL		PARALLEL
PAT		PATTERN
PAX		PASSENGER(S)
PCL		PILOT CONTROLLED LIGHT
PCN		PAVEMENT CLASSIFICATION NUMBER
PCZ		POSITIVE CONTROL ZONE
PDC		PRE DEPARTURE CLEARANCE
PDT		PACIFIC DAYLIGHT TIME
PERM		PERMANENT
PISTON		PISTON AIRCRAFT
PJE		PARACHUTE JUMPING EXERCISE
PLA		PRACTICE LOW APPROACH
PLASI		PULSATING VISUAL APPROACH SLOPE INDICATOR
PLW		PLOW/PLOWED
PN		PRIOR NOTICE REQUIRED
PPO		PRIOR PERMISSION ONLY
PPR		PRIOR PERMISSION REQUIRED
PRA		PRECISION RADAR APPROACH
PRM		PRECISION RADAR MONITOR
PRN		PSUEDO RANDOM NOISE
PROC		PROCEDURE
PROP		PROPELLER AIRCRAFT
PSP		PIERCED STEEL PLANKING
PSP		PACIFIC STANDARD TIME
PSR		PACKED SNOW ON RUNWAY(S)
PTCHY		PATCHY
PTN		PROCEDURE TURN
PVT		PRIVATE OPERATOR OR PRIVATE

QDM		MAGNETIC BEARING TO FACILITY
QDR		MANETCI BEARING FROM FACILITY
QFE		HEIGHT ABOVE AIRPORT ELEVATION



R		RIGHT
RA		RADIO ALTIMETER
RAI		RUNWAY ALIGNMENT INDICATOR
RAIL		RUNWAY ALIGNMENT INDICATOR LIGHTS
RAMOS		REMOTE AUTOMATIC METEROLOGICAL OBSERVING SYSTEM
RAPCON		RADAR APPROACH CONTROL
RCAG		REMOTE COMMUNICATIONS AIR GROUND
RCC		RESCUE COORDINATION CENTER
RCL		RUNWAY CENTERLINE
RCLL		RUNWAY CENTERLINE LIGHT SYSTEM
RCLM		RUNWAY CENTER LINE MARKINGS
RCO		REMOTE COMMUNICATIONS OUTLET	
REC		RECEIVE/RECEIVER
REF		REFERENCE
REIL		RUNWAY END IDENTIFIER LIGHTS
RENL		RUNWAY END IDENTIFIER LIGHTS
RELC		RELOCATED
REP		REPORTING POINT
REP		RAM ENTRANCE POINT
RL		RUNWAY LIGHT
RLLS		RUNWAY LEAD-IN LIGHTS SYSTEM
RM		Remarks (PIREP)
/RM		Remarks (PIREP)
RMNDR		REMAINDER
RNAV		AREA NAVIGATION
RNP		REQUIRED NAVIGATION PERFORMANCE
ROC		RATE OF CLIMB
RPLC		REPLACE
RPT		REGULAR PUBLIC TRANSPORT
RQRD		REQUIRED
RRL		RUNWAY REMAINING LIGHTS
RSR		EN ROUTE SURVEILLANCE RADAR
RSVN		RESERVATION
RT		RIGHT TURN
RTE		ROUTE
RTR		REMOTE TRANSMITTER/RECEIVER
RTS		RETURN TO SERVICE
RUF		ROUGH
RVR		RUNWAY VISUAL RANGE
RVRM		RUNWAY VISUAL RANGE MIDPOINT
RVRR		RUNWAY VISUAL RANGE ROLLOUT
RVRT		RUNWAY VISUAL RANGE TOUCHDOWN
RVSM		REDUCED VERTICAL SEPARATION MINIMUM
RVV		RUNWAY VISBILITY VALUES
RWY		RUNWAY

S		SOUTH
SA 		SAND, SANDED
SALS		SHORT APPROACH LIGHT SYSTEM
SALSF		SHORT APPROACH LIGHT WYSTEM WITH SEQUECED FLASHING LIGHTS
SAR		SEARCH AND RESCUE
SAT		SATURDAY
SATCPM		SATELLITE VOICE AIR GROUND CALLING
SAWRS		SUPPLEMANTARY AVIATION WEATHER REPORTING STATION
SB		SOUTHBOUND
SCA		SOUTHERN CONTROL AREA
SCOB		SCATTERED CLOUDS OR BETTER
SDF		SIMPLIFIED DIRECTIONAL FACILITY
SE		SOUTHEAST
SEC		SECONDS
SELCAL		SELECTIVE CALL SYSTEM
SFL		SEQUENCED FLASHING LIGHTS
SID		STANDARD INSTRUMENT DEPARTURE
SIMUL		SIMULTANEOUS OR SIMULTANEOUSLY
SIR		PACKED OR COMPACTED SNOW AND ICE ON RUNWAYS
SIWL		SINGLE ISOLATED WHEEL LOAD
SK		Sky Cover (PIREP)
/SK		Sky Cover (PIREP)
SKD		SCHEDULED
SKED		SCHEDULED
SLP		SPEED LIMITING POINT
SLR		SLUSH ON RUNWAY(S)
SM		STATUTE MILES
SMGCS		SURFACE MOVEMENT GUIDANCE AND CONTROL SYSTEM
SN		SNOW
SNBNK		SNOWBANK(S) CAUSED BY PLOWING
SNGL		SINGLE
SOC		START OF CLIMB
SODALS		SIMPLIFIED OMNIDIRECTIONAL APPROACH LIGHTING SYSTEM
SPD		SPEED
SRA		SPECIAL RULES AREA
SRA		SURVEILLANCE RADAR APPROACH
SRE		SURVEILLANCE RADAR ELEMENT
SR-SS		SUNRISE SUNSET
SSALF		SIMPLIFIED SHORT APPROACH LIGHT SYSTEM WITH SEQUENCED FLASHING LIGHTS
SSALR		SIMPLIFIED SHORT APPROACH LIGHT SYSTEM WITH RUNWAY ALIGNMENT INDICATOR LIGHTS
SSALS		SIMPLIFIED SHORT APPROACH LIGHT SYSTEM
SBB		SINGLE SIDEBAND
SSR		SECONDARY SERVEILLANCE RADAR
STA		STRAIGHT-IN APPROACH
STAR		STANDARD TERMINAL ARRIVAL
STD		STANDARD	
ST-IN		STRAIGHT IN
STOL		SHORT TAKE OFF AND LANDING
SUN		SUNDAY
SVC		SERVICE
SVN		SATELLITE VEHICLE NUMBER
SW		SINGLE WHEEL LANDING GEAR
SW		SOUTHWEST
SWEPT		SWEPT OR BROOM/BROOMED


T		TERRAIN CLEARANCE ALTITUDE (MOCA)
T		TRANSMITS ONLY
T		TEMPERATURE
TA		TRANSITION ALTITUDE
TA              Ambient Temperature (PIREP)
/TA             Ambient Temperature (PIREP)
TAA		TERMINAL ARRIVAL AREA
TACAN		TACTICAL AIR NAVIGATION
TAR		TERMINAL AREA SURVEILLANCE RADAR
TAS		TRUE AIR SPEED
TB		Turbulence (PIREP)
/TB		Turbulence (PIREP)
TCAS		TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM
TCH		THRESHOLD CROSSING HEIGHT
TCTA		TRANSCONTINENTAL CONTROL AREA
TDWR		TERMINAL DOPPLER WEATHER RADAR
TDZ		TOUCHDOWN ZONE
TDZ LGT		TOUCHDOWN ZONE LIGHTS
TDZE		THOUCHDOWN ZONE ELEVATION
TEMP		TEMPORARY
TEMPO		TEMPORARY OR TEMPORARILY
TERPS		US STANDARD FOR TERMINAL INSTRUMENT PRECEDURE
TFC		TRAFFIC
TFR		TEMPORARY FLIGHT RESTRICTION
TGL		TOUCH AND GO LANDINGS
THN		THIN
THR		THRESHOLD
THRU		THROUGH
THU		THURSDAY
TIBA		TRAFFIC INFORMATION BROADCAST BY AIRCRAFT
TIL		UNTIL
TKOF		TAKEOFF
TL		TRANSITION LEVEL
TM		TRAFFIC MANAGEMENT
TM		Time PIREP received
/TM		Time PIREP received
TMA		TERMINAL CONTROL AREA
TML		TERMINAL
TMN		TERMINATES
TMPA		TRAFFIC MANAGEMENT PROGRAM ALERT
TODA		TAKE OFF DISTANCE AVAILABLE
TORA		TAKE OFF RUN AVAILABLE
TP		Type Plane/Aircraft (PIREP)
/TP		Type Plane/Aircraft (PIREP)
TRACON		TERMINAL RADAR APPROACH CONTROL
TRANS ALT	TRANSITIION ALTITUDE
TRANS LEV	TRANSITION LEVEL
TRCV		TRI COLOR VISUAL APPROACH SLOPE INDICATOR
TRML		TERMINAL
TRNG		TRAINING
TRSN		TRANSITION
TSNT		TRANSIENT
TUE		TUESDAY
TVOR		TERMINAL VOR
TWEB		TRANSCRIBED WEATHER BROADCAST
TWIP		TERMINAL WEATHER INFORMATION FOR PILOTS
TWR		TOWER
TWY		TAXIWAY

U		UNSPECIFIED
U		UNICOM
UAV		UNMANNED AIR VEHICLES
UFN		UNTIL FURTHER NOTICE
UHF		ULTRA HIGH FREQUENCY
UIR		UPPER FLIGHT INFORMATION REGION
UNAVBL		UNAVAILABLE
UNCT'L		UNCONTROLLED
UNICOM		AERONAUTICAL ADVISORY SERVICE
UNL		UNLIMITED
UNLGTD		UNLIGHTED
UNMKD		UNMARKED
UNMNT		UNMONITORED
UNREL		UNRELIABLE
UNUSBL		UNUSABLE
USAF		US AIR FORCE


USB		UPPER SIDEBAND
USN		US NAVY
UTA		UPPER CONTROL AREA
UTC		COORDINATED UNIVERSAL TIME
UA		ROUTINE PIREP (PIREP)
UUA             URGENT PIREP  (PIREP)

VAR		MAGNETIC VARIATION
VASI		VISUAL APPROACH SLOPE INDICATOR
VDP		VISUAL DESCENT POINT
VE		VISUAL EXEMPTED
VFR		VISUAL FLIGHT RULES
VGSI		VISUAL GLIDE SLOPE INDICATOR
VHA		VOLCANIC HAZARD AREA
VHF		VERY HIGH FREQUENCY
VIA		BY WAY OF
VICE		INSTEAD/VERSUS
VIS		VISIBLILITY
VMC		VISUAL METEOROLOGICAL CONDITIONS
VNAP		VERTICAL NOISE ABATEMENT PROCEDURES
VNAV		VERTICAL NAVIGATION
VOL		VOLUME
VOLMET		METEOROLOGICAL INFORMATION AIRCRAFT IN FLGIHT
VOR		VHF OMNIDIRECTIONAL RANGE
VORTAC		VOR AND TACAN CO-LOCATED
VOT		RADIATED TEST SGNAL FOR VOR
VPA		VERTICAL PATH ANGLE
VV		VERTICAL VISBILITY
V/V		VERTICAL VELOCITY

W		WEST
WB		WESTBOUND
W/O		WITHOUT
W/P		AREA NAVIGATION
WED		WEDNESDAY
WEF		WITH EFFECT FROM OR EFFECTIVE FROM
WI		WITHIN
WKDAYS		MONDAY THROUGH FRIDAY
WKEND		SATURDAY AND SUNDAY
WND		WIND
WPT		WAYPOINT
WSR		WET SNOW ON RUNWAY(S)
STR		WATER ON RUNWAY(S)
WV              Wind Velocity (PIREP)
/WV             Wind Velocity (PIREP)
WX		WEATHER
/WX		WEATHER (PIREP)
X		ON REQUEST

Y/S		UNSERVICABLE

Z		ZULU TIME OR COORDINATED UNIVERSAL TIME