TAF

TAF

An Aerodrome Forecast (TAF) report is a routine aerodrome forecast intended for distribution beyond an aerodrome. TAF reports report base forecast conditions, and modifications to those conditions throughout the valid period. TAF reports include similar information to a METAR/SPECI trend forecast. However, TAF forecast information includes additional detail. Aerodromes can issue both METAR/SPECI and TAF reports on a routine basis, but TAFs are not issued by every METAR-reporting aerodrome. The issuance of a new forecast by a meteorological office, such as a TAF, cancels any forecast of the same type previously issued for the same place and for the same period of validity or part thereof. Prevailing conditions and forecast changes differ in that the prevailing conditions can include temperatures, base conditions do not include a change indicator, and that forecast changes may report no significant weather (NSW). Rather than have two class hierarchies, constraints are present ensuring that each (base and forecast conditions) only include relevant information

Properties Definition Type
aerodrome The aerodrome location for this report AirportHeliport
baseForecast The prevailing conditions. Mandatory in all cases except missing or cancelled reports MeteorologicalAerodromeForecast
cancelledReportValidPeriod The valid time period for the previously cancelled report TM_Period
changeForecast Forecast that modifies the base forecast. While there is no maximum number of forecasts, this should normally not exceed five in number. ICAO Annex 3 / WMO No. 49-2: Section 1.5: The number of change and probability groups should be kept to a minimum and should not normally exceed five groups"." MeteorologicalAerodromeForecast
isCancelReport Indicates whether the report is a 'CANCELLATION' report (true) which cancels a previously issued report or not (false or empty). Boolean
issueTime The time at which this report was issued. Note that this should be identical to the resultTime of each MeteorologicalAerodromeForecast, whose results are made available at the same time as this report. TAF reports have an issueTime to assist in discovery and to provide unambiguous semantics at the report level. TM_Instant
validPeriod The time frame at which this report is valid. All forecast elements should be valid within this period TM_Period

Details

TAF

TAF

An Aerodrome Forecast (TAF) report is a routine aerodrome forecast intended for distribution beyond an aerodrome. TAF reports report base forecast conditions, and modifications to those conditions throughout the valid period. TAF reports include similar information to a METAR/SPECI trend forecast. However, TAF forecast information includes additional detail. Aerodromes can issue both METAR/SPECI and TAF reports on a routine basis, but TAFs are not issued by every METAR-reporting aerodrome. The issuance of a new forecast by a meteorological office, such as a TAF, cancels any forecast of the same type previously issued for the same place and for the same period of validity or part thereof. Prevailing conditions and forecast changes differ in that the prevailing conditions can include temperatures, base conditions do not include a change indicator, and that forecast changes may report no significant weather (NSW). Rather than have two class hierarchies, constraints are present ensuring that each (base and forecast conditions) only include relevant information

Semantic Correspondence
AIRM Concept Definition
TAF Message to transmit aerodrome forecasts and amendments prepared by the meteorological office designated the meteorological authority concerned.
Notes

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

aerodrome

TAF.aerodrome

The aerodrome location for this report

Semantic Correspondence
AIRM Concept Definition
AerodromeCondition.aerodrome The aerodrome which is subject to observation or forecast.

baseForecast

TAF.baseForecast

The prevailing conditions. Mandatory in all cases except missing or cancelled reports

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

cancelledReportValidPeriod

TAF.cancelledReportValidPeriod

The valid time period for the previously cancelled report

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

changeForecast

TAF.changeForecast

Forecast that modifies the base forecast. While there is no maximum number of forecasts, this should normally not exceed five in number. ICAO Annex 3 / WMO No. 49-2: Section 1.5: The number of change and probability groups should be kept to a minimum and should not normally exceed five groups"."

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

isCancelReport

TAF.isCancelReport

Indicates whether the report is a 'CANCELLATION' report (true) which cancels a previously issued report or not (false or empty).

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

issueTime

TAF.issueTime

The time at which this report was issued. Note that this should be identical to the resultTime of each MeteorologicalAerodromeForecast, whose results are made available at the same time as this report. TAF reports have an issueTime to assist in discovery and to provide unambiguous semantics at the report level.

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

validPeriod

TAF.validPeriod

The time frame at which this report is valid. All forecast elements should be valid within this period

Semantic Correspondence
AIRM Concept Definition
TemporalEnabledEntity.startValidity Date and time at which the data contained in the entity state starts to be effective
TemporalEnabledEntity.endValidity Date and time at which the data contained in the entity state ceases to be effective