Notices to Airmen
Contractions
NOTAM CONTRACTIONS This list contains most of the commonly used contractions currently in use in Notices to Airmen (NOTAMS) and the standard aviation weather products, such as METAR/TAF, area forecasts, SIGMETs, AIRMETs, etc. Contraction
Decode A
Contraction BRG
Bearing
Decode
ABN ABV ACC ACCUM
Airport Beacon Above Area Control Center (ARTCC) Accumulate
BYD
Beyond
CAAS
Class A Airspace
ACFT ACR ACT ADJ
Aircraft Air Carrier Active Adjacent
CAT CBAS CBSA CCAS
Category Class B Airspace Class B Surface Area Class C Airspace
ADZD AFD AGL ALS ALT ALTM ALTN ALTNLY ALSTG AMDT AMGR AMOS AP
Advised Airport Facility Directory Above ground level Approach Light System Altitude Altimeter Alternate Alternately Altimeter Setting Amendment Airport Manager Automatic Meteorological Observing System Airport
CCLKWS CCSA CD CDAS CDSA CEAS CESA CFR CGAS CHG CIG CK CL
Counterclockwise Class C Surface Area Clearance Delivery Class D Airspace Class D Surface Area Class E Airspace Class E Surface Area Code of Federal Regulations Class G Airspace Change Ceiling Check Centerline
APCH AP LGT APP ARFF
Approach Airport Lights Approach control Aircraft Rescue & Fire Fighting
CLKWS CLR CLSD CMB
Clockwise Clearance, clear(s), cleared to Closed Climb
ARR ASOS ASPH ATC ATCSCC
Arrive, arrival Automated Surface Observing System Asphalt Air Traffic Control Air Traffic Control System Command Center
CMSND CNL COM CONC CPD
Commissioned Cancel Communications Concrete Coupled
ATIS AUTH AUTOB AVBL AWOS AWY AZM
Automatic Terminal Information Service Authority Automatic Weather Reporting System Available Automatic Weather Observing/Reporting System Airway Azimuth
CRS CTC CTL
Course Contact Control
BA FAIR BA NIL BA POOR BC BCN BERM
Braking action fair Braking action nil Braking action poor Back Course Beacon Snowbank(s) Containing Earth/Gravel
DALGT DCMSND DCT DEGS DEP DEPPROC DH DISABLD DIST DLA
Daylight Decommissioned Direct Degrees Depart/Departure Departure procedures Decision Height Disabled Distance Delay or delayed
BLW BND
Below Bound
DLT DLY
Delete Daily
B
C
D
1
Contractions
Contraction DME DMSTN DP DRFT DSPLCD
Notices to Airmen
Decode Distance Measuring Equipment Demonstration Dew Point Temperature Snowbank(s) Caused By Wind Action Displaced E
E EB EFAS ELEV ENG ENRT
East Eastbound En Route Flight Advisory Service Elevation Engine En route
ENTR EXC
Entire Except
FAC FAF
Facility or facilities Final Approach fix
FAN MKR FDC
Fan Marker Flight Data Center
FI/T FI/P FM FREQ FNA
Flight inspection temporary Flight inspection permanent From Frequency Final approach
F
Contraction HR
Hour
Decode
IAF IAP
Initial approach fix Instrument Approach Procedure
INBD ID IDENT IF ILS IM IMC IN
Inbound Identification Identify/Identifier/Identification Intermediate fix Instrument Landing System Inner Marker Instrument Meteorological Conditions Inch/Inches
INDEFLY INFO INOP
Indefinitely Information Inoperative
INSTR INT INTL INTST
Instrument Intersection International Intensity
IR
Ice On Runway(s)
KT
Knots
L LAA LAT LAWRS LB LC
Left Local Airport Advisory Latitude Limited Aviation Weather Reporting Station Pound/Pounds Local Control Local/Locally/Location Located Localizer Type Directional Aid Light or lighting
I
K
L
FPM FREQ FRH
Feet per minute Frequency Fly Runway Heading
FRI FRZN FSS FT
Friday Frozen Automated/Flight Service Station Foot, feet
GC
Ground Control
LOC LCTD LDA LGT
GCA GOVT
Ground Control Approach Government
LGTD LIRL
Lighted Low Intensity Runway Lights
GP GPS GRVL
Glide Path Global Positioning System Gravel
LLWAS LM LDG LLZ LO
Low Level Wind Shear Alert System Compass Locator at ILS Middle Marker Landing Localizer Compass Locator at ILS Outer Marker
HAA HAT HDG HEL HELI HIRL HIWAS HLDG HOL HP
Height Above Airport Height Above Touchdown Heading Helicopter Heliport High Intensity Runway Lights Hazardous Inflight Weather Advisory Service Holding Holiday Holding Pattern
LONG LRN LSR LT
Longitude Loran Loose Snow on Runway(s) Left Turn
MAG MAINT MALS
Magnetic Maintain, maintenance Medium Intensity Approach Light System
G
H
2
M
Notices to Airmen
Contraction MALSF
Contractions
Decode Medium Intensity Approach Light System with Sequenced Flashers
MALSR
Medium Intensity Approach Light System with Runway Alignment Indicator Lights
MAPT MCA MDA MEA
Missed Approach Point Minimum Crossing Altitude Minimum Descent Altitude Minimum Enroute Altitude
MED MIN MIRL MLS
Medium Minute Medium Intensity Runway Lights Microwave Landing System
MM MNM MNT MOC MON
Middle Marker Minimum Monitor/Monitoring/Monitored Minimum Obstruction Clearance Monday
MRA MSA MSAW MSG MSL MU MUD MUNI
Minimum reception altitude Minimum Safe Altitude/Minimum Sector Altitude Minimum Safe Altitude Warning Message Mean Sea Level MU meters Mud Municipal N
Contraction
Decode P
PAEW PAPI PAR PARL
Personnel and Equipment Working Precision Approach Path Indicator Precision Approach Radar Parallel
PAT PAX PCL PERM PJE PLA PLW PN
Pattern Passenger Pilot Controlled Lighting Permanent/Permanently Parachute jumping exercise Practice Low Approach Plow/Plowed Prior Notice Required
PPR PREV PRN
Prior Permission Required Previous Psuedo random noise
PROC PROP PSR PTCHY
Procedure Propeller Packed Snow on Runway(s) Patchy
PTN PVT
Procedure Turn Private
RAIL
Runway Alignment Indicator Lights Remote Automatic Meteorological Observing System
R
RAMOS
N NA NAV NB
North Not Authorized Navigation Northbound
RCAG RCL RCLL RCO
Remote Communication Air/Ground Facility Runway Centerline Runway Centerline Light System Remote Communication Outlet
NDB NE
Nondirectional Radio Beacon Northeast
REC RELCTD
Receive/Receiver Relocated
NGT NM NMR
Night Nautical Mile(s) Nautical Mile Radius
REIL REP RLLS
Runway End Identifier Lights Report Runway Leadïin Lights System
NONSTD NOPT NR
Nonstandard No Procedure Turn Required Number
RMNDR RNAV
Remainder Area Navigation
NTAP NW
Notice To Airmen Publication Northwest
RPLC RQRD RRL RSR RSVN
Replace Required Runway Remaining Lights En Route Surveillance Radar Reservation
OBSC
Obscured
OBST OM OPR OPS ORIG
Obstruction Outer Marker Operate Operation Original
RT RTE RTR RTS RUF
Right Turn Route Remote Transmitter/Receiver Return to Service Rough
OTS OVR
Out of Service Over
RVR RVRM RVRR RVRT
Runway Visual Range Runway Visual Range Midpoint Runway Visual Range Rollout Runway Visual Range Touchdown
O
3
Contractions
Contraction RWY
Runway
S SA SAT
South Sand, sanded Saturday
SAWR SB SDF SE SFL SID SIMUL SIR
Notices to Airmen
Decode
Contraction TIL TKOF TM TMPA TRML
Decode Until Takeoff Traffic Management Traffic Management Program Alert Terminal
Supplementary Aviation Weather Reporting Station Southbound Simplified Directional Facility Southeast Sequence Flashing Lights Standard Instrument Departure Simultaneous Packed or Compacted Snow and Ice on Runway(s)
TRNG TRSN TSNT TUE
Training Transition Transient Tuesday
TWR TWY
Tower Taxiway
SKED SLR SN
Scheduled Slush on Runway(s) Snow
UFN UNAVBL UNLGTD
Until further notice Unavailable Unlighted
SNBNK SNGL SPD
Snowbank(s) Caused by Plowing Single Speed Simplified Short Approach Lighting System with Sequenced Flashers
UNMKD UNMNT UNREL UNUSBL
Unmarked Unmonitored Unreliable Unusable
VASI VDP VGSI VIA VICE VIS VMC VOL VOR VORTAC
Visual Approach Slope Indicator Visual Descent Point Visual Glide Slope Indicator By Way Of Instead/Versus Visibility Visual Meteorological Conditions Volume VHF OmniïDirectional Radio Range VOR and TACAN (colocated)
W WB WED WEF WI
West Westbound Wednesday With effect from or effective from Within
WIE WKDAYS WKEND WND WPT
With immediate effect or effective immediately Monday through Friday Saturday and Sunday Wind Waypoint
WSR WTR WX
Wet Snow on Runway(s) Water on Runway(s) Weather
S
SSALF SSALR
Simplified Short Approach Lighting System with Runway Alignment Indicator Lights
SSALS SSR STA
Simplified Short Approach Lighting System Secondary Surveillance Radar Straightïin Approach
STAR SUN SVC SW SWEPT
Standard Terminal Arrival Sunday Service Southwest Swept or Broom/Broomed
T TAA TACAN
Temperature Terminal Arrival Area Tactical Air Navigational Aid
TAR
Terminal area surveillance radar
TDZ TDZ LG TEMPO TFC TFR TGL THN
Touchdown Zone Touchdown zone lights Temporary Traffic Temporary Flight Restriction Touch and Go Landings Thin
THR THRU THU
Threshold Through Thursday
T
4
U
V
W
Notices to Airmen
Contractions
WEATHER CONTRACTIONS Contraction
Decode A
A A A A01
Absolute (temperature) Alaskan Standard Time (time groups only) Arctic (air mass) Automated Observation without Precipitation Discriminator (rain/snow) (METAR)
A02
Automated Observation with Precipitation Discriminator (rain/snow) (METAR)
AAWF AC ACC ACSL ACYC ADRNDCK ADV ADVCTN ADVY AFC AFDK ALF ALGHNY ALQDS ALSEC ALTA ALUTN ALWF AM AMD AMPLTD AMS AMS ANLYS APLCN AS ASOS ATLC AURBO AWP
Auxiliary Aviation Weather Facility Altocumulus Altocumulus Castellanus Standing Lenticular Altocumulus Anticyclonic Adirondack Advise Advection Advisory Area Forecast Center After Dark Aloft Allegheny All Quadrants All Sectors Alberta Aleutian Actual Wind Factor Ante Meridiem Amended Forecast (TAF) Amplitude Air Mass American Meteorological Society Analysis Appalachian Altostratus Automated Surface Observing System Atlantic Aurora Borealis Aviation Weather Processors
B
Beginning of Precipitation (time in minutes) (weather reports only)
B BACLIN BATROP BC BC BCFG BCH BCKG BDA
Bering Standard Time (time groups only) Baroclinic or Baroclinic Prognosis Barotropic or Barotropic Prognosis Patches (METAR) British Columbia Patchy Fog (METAR) Beach Backing Bermuda
B
Contraction BECMG
Decode Becoming (expected between 2 digit beginning hour and 2 digit ending hour) (TAF)
BFDK BINOVC BKN BL BL BLD BLDUP BLKHLS BLKT BLZD BMS BNDRY BOVC BR BRF BRKHIC BRKSHR BRM BTWN
Before Dark Breaks in Overcast Broken Between Layers Blowing (METAR) Build Buildup Black Hills Blanket Blizzard Basic Meteorological Services Boundary Base of Overcast Mist (METAR) Brief Breaks in Higher Overcast Berkshire Barometer Between
C C CAN CARIB CASCDS CAVOK CAVU
Central Standard Time (time groups only) Continental (air mass) Canada Caribbean Cascades Cloud and Visibility OK (METAR) Clear or Scattered Clouds and Visibility Greater Than Ten Miles
CAWS CB CBMAM CC CCLKWS CCSL CDFNT CFP CHARC CHSPK CI CIG CLD CLR
Common Aviation Weather Subïsystem Cumulonimbus Cumulonimbus Mamma Cirrocumulus Counterclockwise Standing Lenticular Cirrocumulus Cold Front Cold Front Passage Characteristic Chesapeake Cirrus Ceiling Cloud Clear at or below 12,000 feet (AWOS/ASOS report) (METAR)
CLRS CNCL CNDN CNVTV CONFDC
Clear and Smooth Cancel Canadian Convective Confidence
C
5
Contractions
Notices to Airmen
Contraction CONTDVD CONTRAILS COR CS CST CTGY CTSKLS CU CUFRA CYC CYCLGN
Decode Continental Divide Condensation Trails Correction to the observation (METAR) Cirrostratus Coast Category Catskills Cumulus Cumulus Fractus Cyclonic Cyclogenesis
DABRK DCAVU
Daybreak Clear or Scattered Clouds and Visibility Greater than Ten, Remainder of Report Missing (weather reports only)
DKTS DMSH DNS DNSLP DNSTRM DP DPNG DPTH DR DRFT DS DSIPT DTLN DTRT DU DVV DWNDFTS DWPNT DZ
Dakotas Diminish Dense Downslope Downstream Deep Deepening Depth Low Drifting (METAR) Drift Dust Storm (METAR) Dissipate International Dateline Deteriorate Widespread Dust (METAR) Downward Vertical Velocity Downdrafts Dew Point Drizzle (METAR)
E E
Eastern Standard Time (time groups only) Ending of Precipitation (time in minutes) (weather reports only)
E E ELNGT EMBDD EMSU ENERN ENEWD EOF ESERN ESEWD EXTRAP
Equatorial (air mass) Estimated (weather reports only) Elongate Embedded Environment Meteorological Support Unit East誰northeastern (weather reports only) East誰northeastward (weather reports only) Expected Operations Forecast East誰southeastern (weather reports only) East誰southeastward (weather reports only) Extrapolate
D
E
Contraction EXTRM
Decode Extreme F
FA FAH FEW FC +FC FG FIBI FILG FINO FL FLDST FLG FLRY FLWIS FM
Area Forecast Fahrenheit 1 or 2 octas (eighths) cloud coverage (METAR) Funnel Cloud (METAR) Tornado/ Water Spout (METAR) Fog (METAR) Filed but Impractical to Transmit Filling Weather Report Will Not Be Filed for Transmission Flash Advisory Flood Stage Falling Flurry Flood Warning Issued From (4 digit beginning time in hours and minutes) (TAF)
FNT FNTGNS FNTLYS FORNN FRMG FROPA FROSFC FRST FRWF FRZ FRZLVL FRZN FT FU FULYR FUOCTY FWC FZ
Front Frontogenesis Frontolysis Forenoon Forming Frontal Passage Frontal Surface Frost Forecast Wind Factor Freeze Freezing Level Frozen Terminal Forecast Smoke (METAR) Smoke Layer Aloft Smoke Over City Fleet Weather Central Supercooled/freezing (METAR)
G GLFALSK GLFCAL GLFMEX GLFSTLAWR GR GRAD GRBNKS GRDL GRTLKS GS GSTS GSTY
Gusts Reaching (knots) (weather reports only) Gulf of Alaska Gulf of California Gulf of Mexico Gulf of St. Lawrence Hail (METAR) Gradient Grand Banks Gradual Great Lakes Small Hail/Snow Pellets (METAR) Gusts Gusty
HCVIS
High Clouds Visible
G
H
6
Notices to Airmen
Contraction HDFRZ HDSVLY HI HIEAT HIEFM HIESE HIESL HIFOR HITMP HIXAT HIXFM HIXSE HIXSL HLSTO HLTP HLYR HURCN HUREP HX HZ
Contractions
Decode Hard Freeze Hudson Valley Hi Highest Temperature Equaled for All Time Highest Temperature Equaled for The Month Highest Temperature Equaled So Early Highest Temperature Equaled So Late High Level Forecast Highest Temperature Highest Temperature Exceeded for All Time Highest Temperature Exceeded for The Month Highest Temperature Exceeded So Early Highest Temperature Exceeded So Late Hailstones Hilltop Haze Layer Aloft Hurricane Hurricane Report High Index Haze (METAR)
Contraction LOEAT LOEFM LOESE LOESL LOTMP LOXAT LOXFM LOXSE LOXSL LSR LTGCC LTGCCCG LTGCG LTGCW LTGIC LTLCG LTNG LX LYR
Decode Lowest Temperature Equaled for All Time Lowest Temperature Equaled for The Month Lowest Temperature Equaled So Early Lowest Temperature Equaled So Late Lowest Temperature Lowest Temperature Exceeded for All Time Lowest Temperature Exceeded for The Month Lowest Temperature Exceeded So Early Lowest Temperature Exceeded So Late Loose Snow on Runway Lightning Cloud-to-Cloud Lightning Cloud-to-Cloud, Cloud-to-Ground Lightning Cloud-to-Ground Lightning Cloud-to-Water Lightning in Clouds Little Change Lightning Low Index Layer or Layered or Layers
M M
Maritime (air mass) In temperature field means ”minus” or below zero (METAR)
M
In RVR Field, indicates visibility less than lowest reportable sensor value (e.g. M0600FT)
M M MA MAN MEGG MEX MHKVLY MI MIDN MIFG
Missing (weather reports only) Mountain Standard Time (time groups only) Map Analysis Manitoba Merging Mexico Mohawk Valley Shallow (METAR) Midnight Patches of Shallow Fog Not Deeper Than Two Meters (METAR)
MLTLVL MMO MNLD MOGR MONTR MOV MRGL MRNG MRTM MS MSTLY MSTR MTN MVFR MXD
Melting Level Main Meteorological Office Mainland Moderate or Greater Monitor Move Marginal Morning Maritime Minus Mostly Moisture Mountain Marginal VFR Mixed
M I
IC ICG ICGIC ICGICIP ICGIP IMDT INLD INSTBY INTR INTRMTRGN INTS INTSFY INVRN IOVC IR
Ice Crystals (METAR) Icing Icing in Clouds Icing in Clouds and Precipitation Icing in Precipitation Immediate Inland Instability Interior InterïMountain Region Intense Intensify Inversion In Overcast Ice on Runway
JTSTR
Jet Stream
K KFRST
Cold (air mass) Killing Frost
LABRDR LCTMP LDG LFT LGRNG LIFR LK
Labrador Little Change in Temperature Landing Lift Long Range Low IFR (weather reports only) Lake
J
K
L
7
Contractions
Notices to Airmen
Contraction
Decode N
NB NCWX NELY NERN NEW ENG NFLD NGT NL NMBR NNERN NNEWD NNWRN NNWWD NO NORPI
New Brunswick No Change in Weather Northeasterly (weather reports only) Northeastern New England Newfoundland Night No Layers Number Northïnortheastern (weather reports only) Northïnortheastward (weather reports only) Northïnorthwestern (weather reports only) Northwestward (weather reports only) Not available (e.g. SLPNO, RVRNO) No Pilot Balloon Observation Will Be Filed Next Collection Unless Weather Changes Significantly
NPRS NS NS NSCSWD
Nonpersistent Nimbostratus Nova Scotia No Small Craft or Storm Warning are Being Displayed
NSW NVA NWLY NWRN
No Significant Weather (METAR) Negative Vorticity Advection Northwesterly (weather reports only) Northwestern (weather reports only)
OBS OBSC OCFNT OCLD OCLN OFP OFSHR OMTNS ONSHR ONT ORGPHC OSV OTAS OTLK OVC
Observation Obscure Occluded Front Occlude Occlusion Occluded Frontal Passage Offshore Over Mountains On Shore Ontario Orographic Ocean Station Vessel On Top and Smooth Outlook Overcast
O
P
P P P
Pacific Standard Time (time group only) Polar (air mass) In RVR field, indicates visibility greater than highest reportable sensor value (e.g. P6000FT)
P6SM PAC PBL PCPN PDMT
Visibility greater than 6 statute miles (TAF only) Pacific Probable Precipitation Predominant
8
Contraction PDMT PDW PL PEN PGTSND PIBAL PISE
Decode Predominate Priority Delayed Weather Ice Pellets (METAR) Peninsula Puget Sound Pilot Balloon Observation No Pilot Balloon Observation Due To Unfavorable Sea Conditions
PISO PIWI
No Pilot Balloon Observation Due To Snow No Pilot Balloon Observation Due To High, or Gusty, Surface Wind
PLW PNHDL PO PPINA
Plow (snow) Panhandle Dust/Sand Whirls (METAR) Radar Weather Report Not Available (or omitted for a reason different than those otherwise stated)
PPINE PPINO
Radar Weather Report No Echoes Observed Radar Weather Report Equipment Inoperative Due To Breakdown
PPIOK
Radar Weather Report Equipment Operation Resumed
PPIOM
Radar Weather Report Equipment Inoperative Due To Maintenance
PR PRBLTY PRESFR PRESRR PRJMP PROB40 PROG PRSNT PS PSG PSG PTCHY PTLY PVA PY
Partial (METAR) Probability Pressure Falling Rapidly Pressure Rising Rapidly Pressure Jump (weather reports only) Probability 40 percent (METAR) Prognosis or Prognostic Present Plus Passage Passing Patchy Partly Positive Vorticity Advection Spray (METAR)
QSTNRY QUE
Quasi-stationary Quebec
R RA RABA RABAL RABAR RACO RADAT RADNO RAFI RAFRZ RAHE
Runway (used in RVR measurement) Rain (METAR) No RAWIN Obs., No Balloons Available Radiosonde Balloon Wind Data Radiosonde Balloon Release No RAWIN Obs., Communications Out Radiosonde Observation Data Report Missing Account Radio Failure Radiosonde Observation Not Filed Radiosonde Observation Freezing Levels No RAWIN Obs., No Gas Available
Q
R
Notices to Airmen
Contractions
Contraction RAICG RAOB RAREP RAVU RAWE RAWI RAWIN RCD RCDNA RCDNE
Decode Radiosonde Observation Icing at Radiosonde Observation Radar Weather Report Radiosonde Analysis and Verification Unit No RAWIN obs., Unfavorable Weather No RAWIN Obs., High and Gusty Winds Upper Winds Obs. (by radio methods) Radar Cloud Detection Report Radar Cloud Detection Report Not Available Radar Cloud Detection Report No Echoes Observed
RCDNO
Radar Cloud Detector Inoperative Due to Breakdown Until
RCDOM
Radar Cloud Detector Inoperative Due to Maintenance Until
RCKY RDG RDWND RESTR RGD RH RHINO RHINO
Rockies (mountains) Ridge Radar Dome Wind Restrict Ragged Relative Humidity Radar Echo Height Information Not Available Radar Range Height Indicator Not Operating on Scan
RIOGD RMK RNFL ROBEPS RPD RSG RUF RY/RWY
Rio Grande Remark(s) Rainfall Radar Operating Below Prescribed Standard Rapid Rising Rough Runway
SA SASK SBSD SC SCSL SCT SELS SELY SERN SFERICS SG SGD SH SHFT SHLW SHRTLY SHWR SIERNEV SIR SKC
Sand (METAR) Saskatchewan Subside Stratocumulus Standing Lenticular Stratocumulus Scattered Severe Local Storms Southeasterly (weather reports only) Southeastern (weather reports only) Atmospherics Snow Grains (METAR) SolarïGeophysical Data Showers (METAR) Shift (weather reports only) Shallow Shortly Shower Sierra Nevada Snow and Ice on Runway Sky Clear (METAR)
S
Contraction SLD SLP SLR SLT SM SMK SMTH SN SNBNK SNFLK SNOINCR SNW SNWFL SP SPECI SPKL SPLNS SPRD SQ SQAL SQLN SS SSERN SSEWD SSWRN SSWWD ST STAGN STFR STFRM STG STM STNRY SWLG SWLY SWRN SX SXN SYNOP SYNS
Decode Solid Sea Level pressure (e.g. 1013.2 reported as 132) Slush on Runway Sleet Statute mile(s) Smoke Smooth Snow (METAR) Snowbank Snowflake Snow Depth Increase in Past Hour Snow Snowfall Station Pressure Special Report (METAR) Sprinkle South Plains Spread Squall (METAR) Squall Squall Line Sandstorm (METAR) South-southeastern (weather reports only) South-southeastward (weather reports only) South-southwestern (weather reports only) Southïsouthwestward (weather reports only) Stratus Stagnation Stratus Fractus Stratiform Strong Storm Stationary Swelling Southwesterly (weather reports only) Southwestern (weather reports only) Stability Index Section Synoptic Synopsis
T T TCU TEMPO
Trace (weather reports only) Tropical (air mass) Towering Cumulus Temporary changes expected (between 2 digit beginning hour and 2 digit ending hour) (TAF)
THD THDR THK THN TKOF TOP TOVC
Thunderhead (non METAR) Thunder (non METAR) Thick Thin Takeoff Cloud Top Top of Overcast
T
9
Contractions
Notices to Airmen
Contraction TPG TRIB TROF TROP TRPCD TRPCL TRPLYR TS TSHWR TSQLS TSTM TURBC TURBT TWRG
Decode Topping Tributary Trough Tropopause Tropical Continental (air mass) Tropical Trapping Layer Thunderstorm (METAR) Thundershower (non METAR) Thundersqualls (non METAR) Thunderstorm (non METAR) Turbulence Turbulent Towering
UAG UDDF UNSBL UNSTBL UNSTDY UNSTL UP UPDFTS UPR UPSLP UPSTRM UVV UWNDS
Upper Atmosphere Geophysics Up and Down Drafts Unseasonable Unstable Unsteady Unsettle Unknown Precipitation (Automated Observations) Updrafts Upper Upslope Upstream Upward Vertical Velocity Upper Winds
V V VA VC VLCTY VLNT VLY VR VRB
Varies (wind direction and RVR) Variable (weather reports only) Volcanic Ash (METAR) Vicinity Velocity Violent Valley Veer Variable wind direction when speed is less than or equal to 6 knots
VRISL VRT MOTN VSBY VSBYDR
Vancouver Island, BC Vertical Motion Visibility Visibility Decreasing Rapidly
U
V
10
Contraction VSBYIR VV
Decode Visibility Increasing Rapidly Vertical Visibility (Indefinite Ceiling) (METAR)
W WA WDCï1 WDCï2 WDLY WDSPRD WEA WFP WINT WND WNWRN WNWWD WPLTO WR WRM WRMFNT WRNG WS
Warm (air mass) AIRMET World Data Centers in Western Europe World Data Centers Throughout Rest of World Widely Widespread Weather Warm Front Passage Winter Wind Westïnorthwestern (weather reports only) Westïnorthwestward (weather reports only) Western Plateau Wet Runway Warm Warm Front Warning Wind Shear (in TAFs, low level and not associated with convective activity)
WS WSHFT WSOM WSR WSWRN WSWWD WTR WTSPT WV WW WXCON
SIGMET Wind Shift Weather Service Operations Manual Wet Snow on Runway Westïsouthwestern (weather reports only) Westïsouthwestward (weather reports only) Water Waterspout Wave Severe Weather Forecast Weather Reconnaissance Flight Pilot Report
XCP XPC
Except Expect
Y YKN YLSTN
Yukon Standard Time (time groups only) Yukon Yellowstone
ZI ZI
Zonal Index Zone of Interior
W
X
Y
Z