Welcome to FltPlan, a free flight planning service for creating and filing IFR and VFR flight plans, obtaining weather briefings and navigation logs for flights in the U.S., Bahamas, Canada, Intra-Canada, Mexico, Central America and most Caribbean airports. FltPlan offers pre-flight, in-flight, and post-flight tools including: Airport/FBO Information, Approach Plates / Digital Charts, Routes with Radar Overlay, Nearby Airports, Fuel Stops, Quick Info, Area Fuel Prices, Flight Schedule Calendar, Customizable A/C Performance, Stored Routes, TOLD Card, Flight Tracking, Planned ATC Routes, Email Notifications, and Historical Flight Tracking with Weather Overlay.
| A | |
| A | PRECEDES THE 4 DIGIT ALTIMETER SETTING (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 | |
| 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 | BOVC |
| BRF | BRIEF |
| BRK | BREAK |
| BRKHIC | BREAKS IN HIGHER OVERCAST |
| BRM | BAROMETER |
| BTL | BETWEEN LAYERS |
| BTWN | BETWEEN |
| C | |
| 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 |
| D | |
| DABRK | DAYBREAK |
| DCAVU | CLEAR/SCATTERED CLOUDS. VISIBILITY GREATER THAN 10, REMAINDER OF REPORT MISSING |
| DKTS | DAKOTAS |
| DMSH | INSERT |
| 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 | |
| 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 |
| F | |
| 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 | |
| G | GUSTS REACHING (KNOTS) (WEATHER REPORTS ONLY) |
| GICG | GLAZE ICING |
| GLFALSKID | 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 |
| H | |
| 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 |
| I | |
| /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) |
| J | |
| JTSTR | JET STREAM |
| K | |
| K | COLD (AIR MASS) |
| KFRST | KILLING FROST |
| KT | KNOTS (FOLLOWS WIND DIRECTION/SPEED - GENERAL) |
| L | |
| 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 | |
| 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 |
| N | |
| 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) |
| O | |
| 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 | |
| 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 | INSERT |
| 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 | |
| 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 |
| S | |
| 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 | INSERT |
| 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 | |
| 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 |
| U | |
| 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 | |
| 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 | |
| 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 | INWET RUNWAYSERT |
| 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 |
| X | |
| XCP | EXCEPT |
| XPC | EXCEPT |
| Y | |
| Y | YUKON STANDARD TIME (TIME GROUPS ONLY) |
| YKN | YUKON |
| YLSTN | YELLOWSTONE |
| Z | |
| Z | APPENDED DATE-TIME GROUPE INDICATES UTC (METAR/TAF) |
| ZI | ZONAL INDEX |
| ZI | ZONE OF INTERIOR |
| 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 |
| 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) |
| 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 |
| A | |
| 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 DEPARTUR |
| 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 |
| B | |
| 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 | |
| C | ATC IFR FLIGHT PLAN CLEARANCE 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 | |
| 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 | |
| E | INSERT |
| EAT | EXPECTED APPROACH TIME |
| EB | EASTBOUND |
| EDT | EASTERN DAYLIGHT TIME |
| EET | ESTIMATED ELAPSED TIME |
| EFAS | ENROUTE FLIGHT 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 |
| F | |
| FAA | FEDERAL AVIATION ADMINISTRATION |
| FAC | FACILITY OR FACILITIES |
| FAF | FINAL APPROACH FIX |
| FAN MKR | FAN MARKER |
| FAP | FINAL APPROACH POINT |
| FAR | FEDERAL AVIATION 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 |
| G | |
| 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 |
| H | |
| 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 | HIGH FREQUENCY |
| HI | HIGH 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 | |
| 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 TRAINING 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 |
| 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 |
| J | |
| JAA | JOINT AVIATION AUTHORITIES |
| K | |
| KGS | KILOGRAMS |
| KHZ | KILOHERTZ |
| KIAS | KNOTS INDICATED AIRSPEED |
| KM | KILOMETERS |
| KMH | KILOMETERS PER HOUR |
| KT | KNOTS |
| KTAS | KNOTS TRUE AIRSPEED |
| KTS | Knots (PIREP) |
| L | |
| 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 OUTER 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 | |
| M | METERS |
| MAA | MAXIMUM AUTHORIZED ALTITUDE |
| MAG | MAGNETIC |
| MAINT | MAINTAIN, MAINTENANCE |
| MALS | MEDIUM 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 INTENSITY |
| 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 | MINIMUM OFF ROUTE ALTITUDE |
| MPS | METERS PER SECOND (1 MPS = 1.944 KTS) |
| MRA | MINIMUM RECEPTION ALTITUDE |
| MSA | MINIMUM SAFE ALTITUDE |
| MSAW | MINIMUM SAFE ALTITUDE WARNING |
| MSG | MESSAGE |
| MSL | MEAN SEA LEVEL |
| MST | MOUNTAIN STANDARD TIME |
| MTA | MILITARY TRAINING 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 | |
| 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 | NON-STANDARD |
| NOPT | NO PROCEDURE TURN |
| NOTAM | NOTICES TO AIRMEN |
| NR | NUMBER |
| NTAP | NOTICE TO AIRMEN PUBLICATION |
| NW | NORTHWEST |
| NWC | NAVAL WEAPONS CENTER |
| O | |
| 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 |
| P | |
| 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 |
| ID | INSERT |
| 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 |
| Q | |
| QDM | MAGNETIC BEARING TO FACILITY |
| QDR | MANETIC BEARING FROM FACILITY |
| QDR | HEIGHT ABOVE AIRPORT ELEVATION |
| R | |
| 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 | |
| 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 |
| ID | SCHEDULED |
| SKED | INSERT |
| 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 SURVEILLANCE 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 | |
| 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 | |
| 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) |
| V | |
| 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 | |
| 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) |
| WTR | WATER ON RUNWAY(S) |
| WV | WIND VELOCITY (PIREP) |
| /WV | WIND VELOCITY (PIREP) |
| WX | WEATHER |
| /WX | WEATHER (PIREP) |
| X | |
| X | ON REQUEST |
| Y | |
| Y/S | UNSERVICABLE |
| Z | |
| Z | ZULU TIME OR COORDINATED UNIVERSAL TIME |