Aerodrome Forecast TAF Codes FCUK 31 EGGY 300900

Aerodrome Forecast (TAF) Codes

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA BKN 015 CB= HEADER: • Letters FC = 9 hour TAF (Issued every 3 hrs. ) • FT = 18 hour TAF. (Issued every 6 hrs. ) • UK 31 = Forecast region. • EGGY = Issuing authority (Bracknell UK). • Date of issue = 30 th. • Time of issue = 0900 UTC. • EGGW = ICAO location identifier. • 301019 = Valid on date 30 th between 1000 UTC and 1900 UTC.

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA • Forecast Elements of a TAF. – Surface Wind – Visibility – Weather – Cloud – Probability – Significant changes – Amendments BKN 015 CB= • Other Groups (not used on UK civil aerodromes). – Forecast temperature. – Airframe ice accretion. – Turbulence.

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA BKN 015 CB= Same format as METAR. Variations in Surface Wind : direction not forecast. 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. Horizontal Visibility : If SKC or CAVOK not appropriate then NSC (no significant cloud) used. Only CB cloud will be specifie

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA • Significant Changes : BKN 015 CB= – BECMG • followed by 4 figure time group indicates expected permanent change in items specified at regular or irregular rate. E. g. BECMG 2124 27017 KT 4000 BKN 010 – 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 • All conditions before FM are superseded by

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA BKN 015 CB= • Significant Changes Cont. : – TEMPO • followed by 4 figure time group indicates temporary variations in f/cast wx. Each occurrence lasting <1 hour and in total less than half period specified. – PROB • followed by 30 or 40 as a % followed by 4 figure time group. E. g. PROB 40 TEMPO 1416 TSRA.

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA BKN 015 CB= Amendments : AMD inserted after location identifier to indicate amended TAF. The new forecast covers remaining period of validity. E. g: TAF EGZZ AMD 130820 Z 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.

FCUK 31 EGGY 300900 EGGW 301019 23010 KT 9999 SCT 010 BECMG 1114 6000 -RA BKN 012 TEMPO 1418 2000 RADZ OVC 004 FM 1800 30020 G 30 KT 9999 -SHRA BKN 015 CB= 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.