MeteorologicalAerodromeForecast


             MeteorologicalAerodromeForecast

Meteorological conditions forecast at an aerodrome. This class is also related but not identical to MeteorologicalAerodromeTrendForecast, which is reported on a METAR/SPECI - conditions reported in trend forecasts in METAR/SPECI differ from forecast groups in a TAF. When no clouds of operational significance or no weather of operational significance is predicted, the nothingOfOperationalSignificance nilReason should be used for the cloud or presentWeather association. Note that the TAC representations for FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast): FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL) TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL) FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity) AT - a phenomenonTime with a TimeInstant"

Properties	Definition	Type
changeIndicator	The type of change being reported (FROM, BECOMING, TEMPORARY, etc.). A change indicator is required for all MeteorologicalAerodromeForecasts excepting reported base conditions.	AerodromeForecastChangeIndicator
cloud	Forecast of cloud.	AerodromeCloudForecast
cloudAndVisibilityOK	When true, indicates that the following conditions occur simultaneously at the time of forecast (also know as CAVOK"): a) visibility, 10km or more, and the lowest visibility is not reported b) no cloud of operational significance c) no weather of significance to aviation Information on visibility, runway visual range, present weather and cloud amount, cloud type and height of cloud base shall not be reported. See ICAO Annex 3 / WMO No. 49-2 Section 2.2."	Boolean
phenomenonTime	The time at which the reported phenomena or change of phenomena occur. For change indicators of FROM, PROB 30/40, and TEMPO this is the period of time at which reported meteorological conditions occur. For BECOMING conditions this represents the time over which conditions are changing. This is equivalent to how time information is reported in the TAC codes	TM_Period
prevailingVisibility	The prevailing horizontal visibility, mandatory except when ceiling and visibility is reported as OK Prevailing horizontal visibility shall be reported in meters (m")."	Distance
prevailingVisibilityOperator	The reported relational operator for the prevailing horizontal visibility. When reported, this operator is reported in conjunction with prevailing visibility. To report a prevailing visibility of at least 10000 meters, prevailing visibility is reported as 10000 meters and the operator is reported as above". When no operator is reported, prevailing visibility represents an exact value with identical semantics to other measured quantities"	RelationalOperator
surfaceWind	Forecast of surface wind.	AerodromeSurfaceWindForecast
temperature	Forecast of temperature.	AerodromeAirTemperatureForecast
weather	Forecast of weather phenomena.	AerodromeForecastWeather

Details

MeteorologicalAerodromeForecast


              MeteorologicalAerodromeForecast

Rationale

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Notes

In Logical Model: urn:aero:airm:1.0.0:LogicalModel:Subjects:Meteorology:AerodromeCondition

changeIndicator


              MeteorologicalAerodromeForecast.changeIndicator

The type of change being reported (FROM, BECOMING, TEMPORARY, etc.). A change indicator is required for all MeteorologicalAerodromeForecasts excepting reported base conditions.

Semantic Correspondence

AIRM Concept	Definition
WeatherCondition.changeIndicator	Indication about the type of meteorological conditions changes.

cloud


              MeteorologicalAerodromeForecast.cloud

Forecast of cloud.

Semantic Correspondence

AIRM Concept	Definition
WeatherCondition.phenomenon	The phenomenon of relevance for the weather condition.
Additional trace Cloud	A hydrometeor consisting of minute particles of liquid water or ice, or of both, suspended in the free air and usually not touching the ground. It may also include larger particles of liquid water or ice and non-aqueous liquid or solid particles such as those present in fumes, smoke and dust.

cloudAndVisibilityOK


              MeteorologicalAerodromeForecast.cloudAndVisibilityOK

When true, indicates that the following conditions occur simultaneously at the time of forecast (also know as CAVOK"): a) visibility, 10km or more, and the lowest visibility is not reported b) no cloud of operational significance c) no weather of significance to aviation Information on visibility, runway visual range, present weather and cloud amount, cloud type and height of cloud base shall not be reported. See ICAO Annex 3 / WMO No. 49-2 Section 2.2."

Semantic Correspondence

AIRM Concept	Definition
AerodromeCondition.cavok	Visibility, cloud and present weather better than prescribed values or conditions.

phenomenonTime


              MeteorologicalAerodromeForecast.phenomenonTime

The time at which the reported phenomena or change of phenomena occur. For change indicators of FROM, PROB 30/40, and TEMPO this is the period of time at which reported meteorological conditions occur. For BECOMING conditions this represents the time over which conditions are changing. This is equivalent to how time information is reported in the TAC codes

Semantic Correspondence

AIRM Concept	Definition
Change request	A change request is required on the AIRM.

prevailingVisibility


              MeteorologicalAerodromeForecast.prevailingVisibility

The prevailing horizontal visibility, mandatory except when ceiling and visibility is reported as OK Prevailing horizontal visibility shall be reported in meters (m")."

Semantic Correspondence

AIRM Concept	Definition
HorizontalVisibility.prevailingVisibility	The greatest visibility value, observed in accordance with the definition of visibility", which is reached within at least half the horizon circle or within at least half of the surface of the aerodrome. These areas could comprise contiguous or non-contiguous sectors."

prevailingVisibilityOperator


              MeteorologicalAerodromeForecast.prevailingVisibilityOperator

The reported relational operator for the prevailing horizontal visibility. When reported, this operator is reported in conjunction with prevailing visibility. To report a prevailing visibility of at least 10000 meters, prevailing visibility is reported as 10000 meters and the operator is reported as above". When no operator is reported, prevailing visibility represents an exact value with identical semantics to other measured quantities"

Semantic Correspondence

AIRM Concept	Definition
RunwayVisualRange.rvrValueInterpretation	The relational operator that can be used for interpreting the RVR value, for instance in order to express a mean RVR of at least 2000 meters (ABOVE 2000 meters).

surfaceWind


              MeteorologicalAerodromeForecast.surfaceWind

Forecast of surface wind.

Semantic Correspondence

AIRM Concept	Definition
WeatherCondition.phenomenon	The phenomenon of relevance for the weather condition.
Additional trace Wind	Air motion relative to the Earth's surface. Unless otherwise specified, only the horizontal component is considered.

temperature


              MeteorologicalAerodromeForecast.temperature

Forecast of temperature.

Semantic Correspondence

AIRM Concept	Definition
Out of scope	This concept is considered as out of the scope of the AIRM.

Notes

AIRM: Check the various temperatures on AviationCondition

weather


              MeteorologicalAerodromeForecast.weather

Forecast of weather phenomena.

Semantic Correspondence

AIRM Concept	Definition
WeatherCondition.phenomenon	The phenomenon of relevance for the weather condition.