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