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Aerodrome Forecast (TAF) Codes

Aerodrome Forecast (TAF) Codes. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB=. Letters FC = 9 hour TAF (Issued every 3 hrs.)

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Aerodrome Forecast (TAF) Codes

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  1. Aerodrome Forecast (TAF) Codes

  2. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= • Letters FC = 9 hour TAF (Issued every 3 hrs.) • FT = 18 hour TAF. (Issued every 6 hrs.) • UK31 = Forecast region. • EGGY = Issuing authority (Bracknell UK). • Date of issue = 30th. • Time of issue = 0900UTC. • EGGW = ICAO location identifier. • 301019 = Valid on date 30th between 1000 UTC and 1900 UTC. HEADER:

  3. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= Forecast Elements of a TAF. Surface Wind Visibility Weather Cloud Probability Significant changes Amendments Other Groups (not used on UK civil aerodromes). Forecast temperature. Airframe ice accretion. Turbulence.

  4. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= Surface Wind : Same format as METAR. Variations in direction not forecast. Horizontal Visibility : Same format as METAR. Only the minimum expected forecast. Weather: If no significant weather expected - group omitted. If the weather after a change group ceases to be significant - abbreviation NSW (no significant weather) inserted. Cloud : When clear sky forecast - SKC (sky clear) inserted or CAVOK if criteria apply. If SKC or CAVOK not appropriate then NSC (no significant cloud) used. Only CB cloud will be specified.

  5. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= • Significant Changes : • BECMG • followed by 4 figure time group indicates expected permanent change in items specified at regular or irregular rate. E.g. BECMG 2124 27017KT 4000 BKN010 • FM • followed by 4 figure time group in hours and minutes UTC to indicate beginning of a self contained part of forecast. • All conditions before FM are superseded by conditions indicated after group.

  6. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= • Significant Changes Cont.: • TEMPO • followed by 4 figure time group indicates temporary variations in f/cast wx. Each occurrence lasting <1hour and in total less than half period specified. • PROB • followed by 30 or 40 as a % followed by 4 figure time group. E.g. PROB40 TEMPO 1416 TSRA.

  7. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= Amendments : AMD inserted after location identifier to indicate amended TAF. The new forecast covers remaining period of validity. E.g: TAF EGZZ AMD 130820Z 130816 In an amended TAF bulletin, the indicators AAA or AAB and time of origin will appear in the header line beginning FC or FT. AMD and date/time not normally used in UK TAF’s.

  8. FCUK31 EGGY 300900 EGGW 301019 23010KT 9999 SCT010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC004 FM1800 30020G30KT 9999 -SHRA BKN015CB= Other Groups: Forecast Temperature Airframe Ice Accretion Turbulence Not used at UK civil aerodromes, but are used in overseas and UK military TAF’s. See handout for decodes. Have not yet been asked in CAA exams.

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