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Term AIRMET
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Significant MeteorologicalInformation(SIGMET)
Broader term
Narrower term
Print on 19 June 2016, at 21:03.
FullDescription:Meteorology
AIRMET
Abbreviation
Definition
information concerning en-route weather phenomena whichmay affect the safety of low-level aircraft operations.
Definition Source
ICAO, Official Definition, DOC 8400 Procedures for AirNavigation Services ? ICAO Abbreviations and Codes 2004,6th ed.
Note
Page 1 of 44
Link Semantic Value
Term AIRMET information
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries AIRMET
Broader term
Narrower term
AIRMET information
Abbreviation
Definition
Information issued by a meteorological watch office concerningthe occurrence or expected occurrence of specified en-routeweather phenomena which may affect the safety of low-levelaircraft operations and which was not already included in theforecast issued for low-level flights in the flight informationregion concerned or sub-area thereof.
Definition Source
ICAO, Official definition
ANNEX 3 Meteorological Service for International AirNavigation 2010
ANNEX 11 Air Traffic Services 2001
Note
Page 2 of 44
Link Semantic Value
Term '
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries SNOWTAM
Broader term Notice to airmen
Narrower term
ASHTAM
Abbreviation
Definition
A special series NOTAM notifying by means of a specificformat change in activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance of aircraftoperations
Definition Source
ICAO/OACI, "International Civil Aviation Vocabulary", Doc.9713, Vol.1, 1998
Note
Page 3 of 44
Link Semantic Value
Term adverse weather conditions
Status
Mandatory for
Contexts SESAR
Categories
Synonyms degraded weather conditions
Relatedentries disruptive weather condition
Broader term adverse conditions
Narrower term
Adverse weather conditions
Abbreviation
Definition
Degraded weather condition: a condition which might have asignificant negative impact on airport performance unless aproper response is organized (i.e. the selection of an airportoperating mode to respond to given degraded conditions andeventually the use of additional airport resources such as de-icing/anti-icing services). This would be the case whenvisibility is poor and/or in case of freezing conditions,precipitations, etc.
Definition Source
ATM Airport Performance Framework (ATMAP) MeasuringAirport Airside and Nearby Airspace Performance, December2009
Note
Lexicon Release
Lexicon Release 2015.2
Page 4 of 44
Link Semantic Value
Term aerodrome forecast
Status
Mandatory for
Contexts
Categories
Synonyms terminal aerodrome forecast
Relatedentries
Broader term
Narrower term
Aerodrome forecast
Abbreviation
TAF
Definition
A TAF is a forecast that consists of a concise statement of theexpected meteorological conditions at an aerodrome for aspecific time period. A TAF contains information on theexpected surface wind, visibility, weather and clouds as well ason expected significant changes to one or more of theseelements during the validity period.
Definition Source
BELGOCONTROL (2010) homepage, Meteorology [1]
Note
Two types of TAFs exist: the 'short' TAF (TAF FC) has a validity period of 9 hours and is issued every 3hours while the 'long' TAF (TAF FT) has a validity period of 30 hours and is issued every 6 hours. (samesource)
Page 5 of 44
Link Semantic Value
Term aircraft observation
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Aircraft observation
Abbreviation
Definition
The evaluation of one or more meteorological elements madefrom an aircraft in flight.
Definition Source
ICAO, Official definition, ANNEX 3 Meteorological Servicefor International Air Navigation 2010
Note
Page 6 of 44
Link Semantic Value
Term aircraft turbulence
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Aircraft turbulence
Abbreviation
Definition
Irregular motion of an aircraft in flight, especially whencharacterized by rapid up-and-down motion, caused by a rapidvariation of atmospheric wind velocities.
Definition Source
American Meteorological Society (AMS), Glossary ofMeteorology [2] 2000
Note
Page 7 of 44
Link Semantic Value
Term aneroid barometer
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries pressure altimeter
Broader term
Narrower term
Aneroid barometer
Abbreviation
Definition
An instrument for measuring atmospheric pressure.
Definition Source
Note
Page 8 of 44
Link Semantic Value
Term area of responsibility (world areaforecast system)
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Significant Meteorological Information
regional area forecast centre
Broader term
Narrower term
Area of responsibility (world area forecast system)
Abbreviation
Definition
A geographical area for which a regional area forecast centreprepares significant weather forecasts.
Definition Source
ICAO, Official definition, ANNEX 3 Meteorological Servicefor International Air Navigation 2010
Note
Page 9 of 44
Link Semantic Value
Term automated weather observation system
Status
Mandatory for
Contexts
Categories
Synonyms automatic weather observation system
Relatedentries
Broader term
Narrower term
Automated weather observation system
Abbreviation
AWOS
Definition
a set of meteorological sensors, and associated systemsdesigned to electronically collect and disseminatemeteorological data.
Definition Source
Transport Canada, GLOSSARY FOR PILOTS AND AIRTRAFFIC SERVICES PERSONNEL, FEBRUARY 2009EDITION
Note
Page 10 of 44
Link Semantic Value
Term barometric altitude
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries pressure altimeter
Broader term
Narrower term
Barometric altitude
Abbreviation
Definition
Geopotential altitude in the Earth's atmosphere above meanstandard sea level pressure datum plane, measured by a pressure(barometric) altimeter.
Definition Source
ICAO, doc. GNSSP/2 Rep. p. 1A-43
Note
Page 11 of 44
Link Semantic Value
Term clear-air turbulence
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
aircraft turbulence
wind shear
Broader term
Narrower term
Clear-air turbulence
Abbreviation
CAT
Definition
A higher altitude (6?15 km) turbulence phenomenon occurringin cloud-free regions, associated with wind shear, particularlybetween the core of a jet stream and the surrounding air.
Definition Source
Note
Page 12 of 44
Link Semantic Value
Term Collaborative Convective ForecastProduct
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Collaborative Convective Forecast Product
Abbreviation
CCFP
Definition
a graphical representation of forecast convective occurrenceverifying at 2-, 4 -, and 6-hours after issuance time.
Definition Source
(United States) Aviation Weather Services, Advisory Circular00-45F, Revision 1
Note
Page 13 of 44
Link Semantic Value
Term disruptive weather condition
Status
Mandatory for
Contexts SESAR
Categories
Synonyms
Relatedentries
adverse weather conditions
nominal weather condition
Broader term adverse conditions
Narrower term
Disruptive weather condition
Abbreviation
Definition
a condition which is very unlikely to occur, it has a severeimpact on airport performance, but the airport does not have anappropriate organized response (this might be the case of heavysnow in Rome). In addition, convective weather might createdisruptive conditions, even if the airport is well prepared torespond to weather.
Definition Source
ATM Airport Performance Framework (ATMAP) MeasuringAirport Airside and Nearby Airspace Performance, December2009
Note
Lexicon Release
Lexicon Release 2015.2
Page 14 of 44
Link Semantic Value
Term downburst
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries microburst
Broader term
Narrower term
Downburst
Abbreviation
Definition
A strong downdraft current of air from a cumulonimbus cloud,often associated with intense thunderstorms. Downdrafts mayproduce damaging winds at the surface.
Definition Source
United States, National Weather Service, glossary [3]
Note
Page 15 of 44
Link Semantic Value
Term aircraft turbulence
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Fog
Abbreviation
FG
Definition
A visible aggregate of minute water particles (droplets) in theair reducing the horizontal visibility at the Earth's surface to lessthan 1 kilometre.
Definition Source
ICAO (2000), official term, ICAO doc. 9640, Manual ofAircraft Ground De/Anti-icing Operation
Note
Page 16 of 44
Link Semantic Value
Term horizontal wind shear
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries vertical wind shear
Broader term wind shear
Narrower term
Horizontal wind shear
Abbreviation
Definition
change of horizontal wind direction and/or speed withhorizontal distance, as would be determined by two or moreanemometers mounted at the same height along a runway.
Definition Source
SKYBRARY, reference tool for aviation safety knowledge [4]
ICAO, doc. CIR 186
Note
Page 17 of 44
Link Semantic Value
Term in-flight icing
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
In-flight icing
Abbreviation
Definition
Ice accreted on an aircraft structure and/or its engines and theirair inlets as a result of flight in atmospheric icing conditions.
Definition Source
SKYBRARY, aviation safety knowledge reference tool, [5]
Note
Page 18 of 44
Link Semantic Value
Term Instrument Meteorological Conditions
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries Instrument Flight Rules
Broader term
Narrower term
Instrument Meteorological Conditions
Abbreviation
IMC
Definition
Meteorological conditions expressed in terms of visibility,distance from cloud, and ceiling, less than the minima specifiedfor visual meteorological conditions.
Definition Source
ICAO (2007) Official definition modified by Amdt 16 to An 6/II (09/11/1995)
Note
Note 1.? [An 11] The specified minima for visual meteorological conditions are contained in Annex 2.
Note 2.? [PANS-ATM] In a control zone, a VFR flight may proceed under instrument meteorologicalconditions if and as authorized by air traffic control.
Page 19 of 44
Link Semantic Value
Term International Airways Volcano Watch
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Significant MeteorologicalInformation(SIGMET)
Volcanic Ash Advisory Centre (VAAC)
Broader term
Narrower term
International Airways Volcano Watch
Abbreviation
IAVW
Definition
International arrangements for monitoring and providingwarnings to aircraft of volcanic ash in the atmosphere.
Definition Source
ICAO, Official definition, Definition added to An 3 by Amdt 71(5/11/1998) and modified by Amdt 72 to An 3,14th ed (1/11/2001).
Note
The IAVW is based on the cooperation of aviation and non-aviation operational units using information derived from observing sources and networks that are providedby States. The watch is coordinated by ICAO with the cooperation of other concerned internationalorganizations.
Page 20 of 44
Link Semantic Value
Term International Standard Atmosphere
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
International Standard Atmosphere
Abbreviation
ISA
Definition
variation of air temperature, pressure, and density with heightabove mean sea level. Used to normalize the results ofaeroplane design calculations and to analyse test data.
Definition Source
ICAO (2008) DOC 9911 Recommended Method for ComputingNoise Contours Around Airports 2008, 1st ed., p. (x)
Note
Page 21 of 44
Link Semantic Value
Term intertropical convergence zone
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Intertropical convergence zone
Abbreviation
ITCZ
Definition
a belt of low pressure which circles the Earth near the equatorwhere the trade winds of the Northern and SouthernHemispheres come together. It is characterised by convectiveactivity which generates often vigorous thunderstorms overlarge areas. It is most active over continental land masses byday and relatively less active over the oceans.
Definition Source
SKYBRARY (aviation safety knowledge reference tool) [6]
Note
Page 22 of 44
Link Semantic Value
Term Low Level Wind Shear Alert System
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries wind shear
Broader term
Narrower term
Low Level Wind Shear Alert System
Abbreviation
LLWAS
Definition
a ground-based system for detecting the existence of wind shearclose to an aerodrome.
Definition Source
SKYBRARY, reference tool for aviation safety knowledge [[7]]
Note
Page 23 of 44
Link Semantic Value
Term Meteorological Watch Office
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Meteorological Watch Office
Abbreviation
MWO
Definition
A meteorological office designated to:
? maintain watch over meteorological conditions affecting flightoperations within its area of responsibility (a Flight InformationRegion (FIR) or a control area or combinations thereof);
? prepare SIGMET and other information related to its area ofresponsibility;
? supply SIGMET information and, as required, othermeteorological information to associated air traffic servicesunits (i.e. ACC or FIC);
? disseminate SIGMET information;
? supply information received on pre-eruption volcanic activity, a volcanic eruption and volcanic ash cloudfor which a SIGMET has not already been issued, to its associated ACC/FIC, as agreed between themeteorological and ATS authorities concerned, and to its associated Volcanic Ash Advisory Centre (VAAC)as determined by regional air navigation agreement; and
? supply information received concerning the accidental release of radioactive materials into the atmosphere,in the area for which it maintains watch or adjacent areas, to its associated ACC/FIC, as agreed between themeteorological and ATS authorities concerned, and to aeronautical information service units, as agreedbetween the meteorological and appropriate civil aviation authorities concerned.
Definition Source
ICAO, Doc. 9377 Manual on Coordination between Air Traffic Services, Aeronautical Information Servicesand Aeronautical Meteorological Services (2008)
Note
Page 24 of 44
Link Semantic Value
Term meteorological office
Status
Mandatory for
Contexts
Categories
Synonyms MET office
Relatedentries
Broader term
Narrower term
Meteorological office
Abbreviation
Definition
An office designated to provide meteorological service forinternational air navigation.
Definition Source
ICAO (2010), Annex 3, Meteorological Service forInternational Air Navigation
Note
A meteorological office and/or aerodrome meteorological officecarries out all or some of the following functions to meet theneeds of flight operations at aerodromes:
? prepare and/or obtain forecasts and other relevant information (e.g. aerodrome warnings and wind shearwarnings and alerts)...;
? prepare and/or obtain forecasts of local meteorological conditions (e.g. aerodrome forecasts (TAF));
? maintain a continuous survey of meteorological conditions over the aerodromes for which it is designatedto prepare forecasts;
? provide briefing, consultation and flight documentation to flight crew members and/or other flightoperations personnel;
? supply other meteorological information to aeronautical users, including associated ATS units (usuallyTWRs and APPs);
? display the available meteorological information;
? exchange meteorological information with other meteorological offices; and
? supply information received on pre-eruption volcanic activity, a volcanic eruption and volcanic ash cloud toits associated air traffic services unit, aeronautical information services unit and meteorological watch officeas agreed between the meteorological, aeronautical information service and ATS authorities concerned.
Note Source
ICAO (2008), doc. 9377 Manual on Coordination between Air Traffic Services, Aeronautical InformationServices and Aeronautical Meteorological Services
Page 25 of 44
Link Semantic Value
Term meteorological services
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Meteorological services
Abbreviation
MET
Definition
Those facilities and services that furnish aviation withmeteorological forecasts, briefs and observations as well asSIGMET information, VOLMET broadcasting material and anyother meteorological data provided by States for aeronauticaluse.
Definition Source
ICAO (2011), doc. ATREPF-K, Air Navigation ServicesFinancial Data
Note
Page 26 of 44
Link Semantic Value
Term microburst
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
downburst
wind shear
Broader term
Narrower term
Microburst
Abbreviation
Definition
A downburst that covers an area less than 4 km along a sidewith peak winds that last 2?5 minutes.
Differential velocity across the divergence center is greater than10 m s?1. The strong wind shears associated with a microburstcan result in aircraft accidents.
Definition Source
United States, National Weather Service, glossary [8]
Note
Page 27 of 44
Link Semantic Value
Term mountain waves
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Mountain waves
Abbreviation
Definition
oscillations to the lee side (downwind) of a mountain caused bythe disturbance in the horizontal air flow caused by the highground.
Definition Source
SKYBRARY, reference tool for aviation safety knowledge [9]
Note
Page 28 of 44
Link Semantic Value
Term nominal weather condition
Status
Mandatory for
Contexts SESAR
Categories
Synonyms
Relatedentries
disruptive weather condition
adverse weather conditions
Broader term
Narrower term
Nominal weather condition
Abbreviation
Definition
a weather condition which is excellent or good to conductairport operations: CAVOK, favourable winds, etc.
Definition Source
ATM Airport Performance Framework (ATMAP) MeasuringAirport Airside and Nearby Airspace Performance, December2009
Note
Lexicon Release
Lexicon Release 2015.2
Page 29 of 44
Link Semantic Value
Term pilot weather report
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Pilot weather report
Abbreviation
PIREP
Definition
A report by a pilot pertaining to weather conditions encounteredin flight.
Definition Source
Transport Canada (2010) Glossary for Pilots and Air TrafficServices Personnel (TP 11958E) [10]
Note
Page 30 of 44
Link Semantic Value
Term planetary boundary layer
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Planetary boundary layer
Abbreviation
Definition
The lower part of the troposphere which is directly influencedby the surface of the Earth.
Definition Source
SKYBRARY, reference tool for aviation safety knowledge [11]
Note
Page 31 of 44
Link Semantic Value
Term pressure altimeter
Status
Mandatory for
Contexts
Categories
Synonyms barometric altimeter
Relatedentries aneroid barometer
Broader term
Narrower term
Pressure altimeter
Abbreviation
Definition
An aneroid barometer calibrated to convert atmosphericpressure into altitude.
Definition Source
Note
Altimeters use standard atmosphere pressure?height relations inconverting pressure into altitude. Therefore, the altimeter showsindicated altitude, which may, and frequently does, differ fromthe actual altitude. An altimeter may be set to measure altitudefrom an arbitrarily chosen level. It is common practice to usemean sea level; the level of the constant-pressure surface of29.92 in. of mercury is also used; and, less frequently, the constant-pressure surface of the pressure at airportheight. See altimeter setting, pressure altitude. (same source)
Page 32 of 44
Link Semantic Value
Term regional area forecast centre
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Regional area forecast centre
Abbreviation
RAFC
Definition
A meteorological centre designated to prepare and supplysignificant weather forecasts and upper wind and temperaturecharts for flights departing from aerodromes within its servicearea and to supply grid point data in digital form for up toworldwide coverage.
Definition Source
ICAO, Official definition, ANNEX 3 Meteorological Servicefor International Air Navigation 2004
Note
Page 33 of 44
Link Semantic Value
Term '
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries ASHTAM
Broader term Notice to airmen
Narrower term
SNOWTAM
Abbreviation
Definition
A special series NOTAM notifying the presence or removal ofhazardous conditions due to snow, ice, slush or standing waterassociated with snow, slush and ice on the movement area, bymeans of a specific format
Definition Source
ICAO DOC 8400 Procedures for Air Navigation Services ?ICAO Abbreviations and Codes 2004, 6th ed.
Note
Page 34 of 44
Link Semantic Value
Term Significant Meteorological Information
Status
Mandatory for
Contexts
Categories
Synonyms Significant Meteorological Message
Relatedentries AIRMET
Broader term
Narrower term
Significant Meteorological Information
Abbreviation
SIGMET
Definition
Information concerning en-route weather phenomena whichmay affect the safety of aircraft operations.
Definition Source
ICAO, Official definition, Doc. 8400/4 (2004)
Note
Page 35 of 44
Link Semantic Value
Term space weather
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Space weather
Abbreviation
Definition
Conditions on the sun and in the solar wind, magnetosphere,ionosphere, and thermosphere that can influence theperformance and reliability of space-borne and ground-basedtechnological systems and can endanger human life or health ofaviation flight crews and passengers.
Definition Source
World Meteorological Organisation (2008) Space ProgrammeSP-5, the Potential Role of WMO in Space Weather
Note
Page 36 of 44
Link Semantic Value
Term '
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Tropical cyclone
Abbreviation
Definition
Generic term for a non-frontal synoptic-scale cycloneoriginating over tropical or sub-tropical waters with organizedconvection and definite cyclonic surface wind circulation.
Definition Source
ICAO, Official definition, Annex 3: Meteorological Service forInternational Air Navigation (2010)
Note
Page 37 of 44
Link Semantic Value
Term tropical cyclone advisory centre
Status
Mandatory for
Contexts EAEA
Categories
Synonyms
Relatedentries
Meteorological Watch Office
World Area Forecast Centre
Broader term tropical cyclone
Narrower term
Tropical cyclone advisory centre
Abbreviation
TCAC
Definition
A meteorological centre designated by regional air navigationagreement to provide advisory information to meteorologicalwatch offices, world area forecast centres and internationalOPMET data banks regarding the position, forecast directionand speed of movement, central pressure and maximum surfacewind of tropical cyclones.
Definition Source
ICAO, Official definition, Annex 3: Meteorological Service forInternational Air Navigation (2010)
Note
Page 38 of 44
Link Semantic Value
Term vertical visibility
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Vertical visibility
Abbreviation
VV
Definition
The distance one can see upward into a surface basedobscuration; or the maximum height from which a pilot in flightcan recognize the ground through a surface based obscuration.
Definition Source
FAA, NOAA, "Aviation Weather", Glossary of Weather Terms[12]
Note
(followed by figures in METAR/SPECI and TAF)
Page 39 of 44
Link Semantic Value
Term vertical wind shear
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries horizontal wind shear
Broader term wind shear
Narrower term
Vertical wind shear
Abbreviation
Definition
change of horizontal wind direction and/or speed with height, aswould be determined by means of two or more anemometersmounted at different heights on a single mast.
Definition Source
SKYBRARY, reference tool for aviation safety knowledge [13]
ICAO, doc. CIR 186, 1987, p. 154
Note
Page 40 of 44
Link Semantic Value
Term Volcanic Ash Advisory Centre
Status
Mandatory for
Contexts EAEA
Categories
Synonyms
Relatedentries
International Airways Volcano Watch(IAVW)
Broader term
Narrower term
Volcanic Ash Advisory Centre
Abbreviation
VAAC
Definition
A meteorological centre designated by regional air navigationagreement to provide advisory information to meteorologicalwatch offices, area control centres, flight information centres,world area forecast centres and international OPMET databanksregarding the lateral and vertical extent and forecast movementof volcanic ash in the atmosphere following volcanic eruptions.
Definition Source
ICAO, Official definition, added to An 3 by Amdt 71 (5/11/1998)
Note
Page 41 of 44
Link Semantic Value
Term volcanic ash
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
Volcanic ash
Abbreviation
Definition
Fine particles of mineral matter from a volcanic eruption whichcan be dispersed long distances by winds aloft.
Definition Source
UNITED STATES, National Oceanic and AtmosphericAdministration's National Weather Service (NOAA) Glossary[14]
Note
The chemical composition and abrasiveness of the particles canseriously affect aircraft and also machinery on the ground. If itis blown into the stratosphere and it is thick enough, it can decrease the global temperature
Page 42 of 44
Link Semantic Value
Term wind shear
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries clear-air turbulence
Broader term
Narrower termvertical wind shear
horizontal wind shear
Wind shear
Abbreviation
Definition
"A change in wind speed and/or wind direction in a shortdistance, resulting in a tearing or shearing effect. It can exist ina horizontal or vertical direction, and occasionally in both."
Definition Source
NATO: NORTH ATLANTIC TREATY ORGANIZATION,Advisory Group for Aerospace Research and Development(AGARD/NATO) (1980), "Agard Multilingual AeronauticalDictionary", Second Edition, London
Note
Page 43 of 44
Link Semantic Value
Term World Area Forecast Centre
Status
Mandatory for
Contexts
Categories
Synonyms
Relatedentries
Broader term
Narrower term
World Area Forecast Centre
Abbreviation
WAFC
Definition
A meteorological centre designated to prepare and issuesignificant weather forecasts and upper-air forecasts in digitalform on a global basis direct to States by appropriate means aspart of the aeronautical fixed service.
Definition Source
ICAO, Official definition, Annex 3: Meteorological Service forInternational Air Navigation (2010)
Note
______________________________________________________________This page was last modified on 15 June 2016, at 16:30.
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