TAF ve Annex.3

 

ICAO Annex.3, Amd.74 ile TAF lardaki “geçerlilik” ve “değişiklik” yazım formatlarındaki değişiklikten dolayı yeni uygulamalar, 30 saatlik öngörülere (TAF) kadar uzatıldı. Böyle bir durumda belirsizliği ortadan kaldırmak için de zaman dilimine gün ilavesi gerekti. Bu yeni uygulama ise, 5 Kasım 2008 saat 0001UTC Çarşamba günü itibari ile kullanıma girmiştir.

Eski Yöntem:

TAF lardaki eski geçerlilik bildiren Gün ve Saat belirleyiciler, aşağıda yaratılan hayali öngörüde şöyle belirlenmekte idi (24 hr TAF):

TAF EGLL 152230Z 160606 13018KT 9999 BKN020 BECMG 0608 SCT013CB BKN020 TEMPO 0812 17025G45KT 3000 TSRA BKN008CB BECMG 1214 20015KT FEW020 TEMPO 0306 4000 BR=

05 Kasım 2008 saat 0001’den itibaren geçerli olacak olan uygulama;

Yeni TAF geçerlilik bildiren Gün ve Saat belirleyicileri, aşağıda yaratılan hayali öngörüde şöyle belirtilecektir (30hr TAF):

TAF EGLL 160505Z 1606/1712 13018KT 9999 BKN020 BECMG 1606/1608 SCT013CB BKN020 TEMPO 1608/1612 17025G45KT 3000 TSRA BKN008CB BECMG 1612/1614 20015KT FEW020 TEMPO 1703/1706 4000 BR TEMPO 1709/1712 BKN012=

PS-Yayın zaman belirleyici gurubu değişmedi. EGLL 160505Z

Artık “Uzun” TAFOR ya da Kısa “TAF” kullanımı yürürlükten kaldırılmıştır. Şimdi her meydan sadece bir tip Öngörü  (TAF) yayınlayacaktır.(Bkz; 6.2.7)

 

Annex.3, Amendment 74,

Chapter.6. FORECASTS

6.2.6 Recommendation.— The period of validity of a routine TAF should be not less than 6 hours nor more than 30 hours; the period of validity should be determined by regional air navigation agreement. Routine TAF valid for less than 12 hours should be issued every 3 hours and those valid for 12 to 30 hours should be issued every 6 hours.

6.2.7 When issuing TAF, meteorological offices shall ensure that not more than one TAF is valid at an aerodrome at any given time.

 

Table A5-1. Template for TAF

 

Key:    M        = inclusion mandatory, part of every message;

            C          = inclusion conditional, dependent on meteorological conditions or method of observation;

            O         = inclusion optional.

Note 1.- The ranges and resolutions for the numerical elements included in TAF are shown in Table A5-3 of this appendix.

Note 2.- The explanations for the abbreviations can be found in the Procedures for Air Navigation Services - ICAO Abbreviations and Codes (PANS-ABC, Doc 8400).

 

Element as specified in Chapter 6

Detailed content

Template(s)

Examples

Identification of the type of forecast (M)

Type of forecast (M)

TAF or TAF AMD or
TAF COR

TAF
TAF AMD

Location indicator (M)

ICAO location indicator (M)

nnnn

YUDO1

Time of issue of forecast (M)

Day and time of issue of the forecast in UTC (M)

nnnnnnZ

160000Z

Identification of a missing forecast (C)

Missing forecast identifier (C)

NIL

NIL

END OF TAF IF THE FORECAST IS MISSING.

Days and period of validity of forecast (M)

Days and period of the validity of the forecast in UTC (M)

nnnn/nnnn

1606/1624

0812/0918

Identification of a cancelled forecast (C)

Cancelled forecast identifier (C)

CNL

CNL

END OF TAF IF THE FORECAST IS CANCELLED.

Surface wind (M)

Wind direction (M)

nnn or VRB2

24015KMH VRB04KMH

(24008KT) (VRB02KT)

19022KMH

(19011KT)

Wind speed (M)

[P]nn[n]

00000KMH

(00000KT)

140P199KMH

(140P99KT)

Significant speed variations (C)3

G[P]nn[n]

12012G35KMH

(12006G18KT)

Units of measurement (M)

KMH (or KT)

24032G54KMH

(24016G27KT)

Visibility (M)

Prevailing visibility (M)

nnnn

0350 CAVOK

7000

9000

9999

 

«       »

 

Expected significant changes to one or more of the above elements during the period of validity (C)4, 10

Change or probability indicator (M)

PROB30 [TEMPO] or PROB40 [TEMPO] or BECMG or TEMPO or FM

TEMPO 0815/0818 25035G50KT TSRA SCT010CB BKN020

TEMPO 2212/2214 17012G25KT 1000 TSRA SCT010CB BKN020

BECMG 3010/3011 00000KT 2400 OVC010

PROB30 1412/1414 0800 FG BECMG 1412/1414 RA

TEMPO 2503/2504 FZRA

TEMPO 0612/0615 BLSN PROB40

TEMPO 2923/3001 0500 FG

Period of occurrence or change (M)

nnnn/nnnn

Wind (C)4

nnn[P]nn[n][G[P]nn[n]]KMH

or

VRBnnKMH

(or

nnn[P]nn[G[P]nn]KT

Or

VRBnnKT)

Prevailing visibility (C)4

nnnn

Weather phenomenon:

intensity (C)6

– or +

-

NSW

 

 

 

 

 

 

 

 

 

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