Which of the following correctly defines the aeronautical meteorological product known as a TAF?
The Terminal Aerodrome Forecast (TAF) is a scheduled meteorological forecast issued for the vicinity of a specific aerodrome, covering a defined validity period.
TAFs are typically issued every 3 or 6 hours and are valid for periods of 9, 24, or 30 hours depending on the aerodrome and issuing authority. They describe expected wind, visibility, weather phenomena, and cloud conditions in coded format.
The TAF must be distinguished from the METAR, which is an observation of actual current conditions, and from SIGMETs and AIRMETs, which are in-flight warnings of significant meteorological phenomena. The TAF is the primary pre-flight planning tool for assessing destination and alternate aerodrome weather, and is required by regulations when planning IFR flights. Its content is forward-looking and probabilistic, not observational.
A scheduled prediction of future weather conditions at a specific aerodrome → CORRECT. TAF stands for Terminal Aerodrome Forecast. It is a coded meteorological forecast valid for a defined future period at a specific aerodrome. Pilots use it during pre-flight planning to assess expected weather at the destination and alternates.
A weather report for an aerodrome → INCORRECT. A weather report of actual observed conditions at an aerodrome is a METAR (Meteorological Aerodrome Report). The METAR describes current conditions, not forecast conditions. The TAF is forward-looking while the METAR is retrospective.
A weather warning for an aerodrome → INCORRECT. Weather warnings for aviation are issued as SIGMETs (for severe meteorological phenomena affecting en-route flight) or AIRMETs (for less severe phenomena). A TAF is a routine scheduled forecast, not a warning. Warnings are reactive and urgent; TAFs are routine and scheduled.
A weather observation for an aerodrome → INCORRECT. Weather observations are conducted by trained observers or automated systems and reported in METAR and SPECI formats. An observation records what is actually happening at the time of issue. A TAF predicts what is expected to happen in the future and has no observational content.
Example of a METAR at LFMN airport: METAR LFMN 011200Z 21010KT CAVOK 15/M04 Q1010 NOSIG
Example of a TAF at LFMN airport: TAF LFMN 010800Z 0109/0215 VRB05KT CAVOK BECMG 0109/0111 22007KT BECMG 0118/0120 33010KT BECMG 0209/0211 18005KT
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