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TEMPO
PROBnn
1
Resolution I
TEMPO
Wind direction: true I 000 - 360 I 10 I
Meaning
used to indicate a significant change in most weather elements occumng at nhnh hours and
nmnm minutes (UTC);
all the elements given before 'FM" are to be included following 'FM" (i.e. they are all
superseded by those following the abbreviation)
the change is forecast to commence at nlnl hours (UTC) and be completed by n2n2 hours
(UTC);
only those elements for which a change is lorecast are to be given following "BECMG";
the time period nln1n2n2 should normally be less than 2 hours and in any case should not
exceed 4 hours
temporary fluctuations are forecast to commence at n,nl hours (UTC) and cease by y2
hours (UTC);
only those elements for which fluctuations are forecast are to be given following TEMPW:
temporary fluctuations should not last more than one hour in each instance, and in the
aggregate, cover less than half of the period nlnln2n,,
Wind speed:
probability of occurrence (in %) ol an atternative
value of a forecast element or elements;
nn = 30 or nn = 40 only;
to be placed atter the element(s) concerned
Visibility:
-
probability of occurrence of temporary
nuchations
Vertical visibility: 30's M (100's Fr) I 000 - 020 I 1 I
Cloud: height of base: 30's M (100's Fr) I 000 - 050 I 1 I
Air temperature (maximum and
minimum):
There IS no aeronautical requirement to report surface wind speeds of 200 kmh (100 kl) or more; however, provision has been made for reporttng wind speeds
up to 399 kmh (199 kt) for nm-aeronautical purposes, as necessary
APP 5-11
Annex 3 - Meteorological Service for International Air Navigation
Example AS-1. TAF
Appendix 5
TAF for YUDO (Donlon/InternationaI)* :
TAF YUDO 1600002 160624 13018KMH 9000 BKN020 BECMG 0608 SCTOI5CB BKN020 TEMPO 0812
17025G45KMH 1000 TSRA SCTOlOCB BKN020 FM1230 15015KMH 9999 BKN020
Meaning of the forecast:
TAF for DonlonAnternational* issued on the 16th of the month at 0000 UTC valid from 0600 UTC to 2400 UTC on the
16th of the month; surface wind direction 130 degrees; wind speed 18 kilometres per hour; visibility 9 kilometres, broken
cloud at 600 metres; becoming between 0600 UTC and 0800 UTC, scattered cumulonimbus cloud at 450 metres and broken
cloud at 600 metres; temporarily between 0800 UTC and 1200 UTC surface wind direction 170 degrees; wind speed
25 kilometres per hour gusting to 45 kilometres per hour; visibility 1 000 metres in a thunderstorm with moderate rain,
scattered cumulonimbus cloud at 300 metres and broken cloud at 600 metres; from 1230 UTC surface wind direction 150
degrees; wind speed 15 kilometres per hour; visibility 10 kilometres or more; and broken cloud at 600 metres.
* Fictitious location
Note.- In this example, the primaty units "kilometre per hour" and "metre" were usedfor wind speed and height of cloud base, respectively.
However. in accordance with Annex 5, the corresponding non-SI alternative units "knot" and 'yoor" may be wed instead.
Example A5-2. Cancellation of TAF
Cancellation of TAF for YUDO (Donlon/InternationaI)*:
TAF AMD YUDO 161 5002 160624 CNL
Meaning of the forecast:
Amended TAF for Donloflntemational* issued on the 16th of the month at 1500 UTC cancelling the previously issued
TAF valid from 0600 UTC to 2400 UTC on the 16th of the month.
* Fictitious location
APP 5-12
Appendix 5 Annex 3 - Meteorological Service for International Air Navigation
Example A5-3. GAMET area forecast
YUCC GAMET VALID 2206001221200 YUDO
AMSWELL FIR12 BLW FLl 00
SECN I
SFC WSPD: 10112 65 KMH
SFC VIS: 06/08 3000 M BR N OF N51
SIGWX: 11112 ]SOL TS
SIG CLD: 06/09 OVC 80011 100 FT AGL N OF N51 1011 2 ISOL TCU 120018000 FT AGL
ICE: MOD FL0501080
TURB: MOD ABV FL090
SIGMETS APPLICABLE: 3, 5
SECN I1
PSYS: 06 L 1004 HPA N5 130 EOlOOO MOV NE 25 KT WKN
WINDIT: 2000 FT 270170 KMH PS03 5000 FT 250180 KMH MS02 10000 FT 240185 KMH
MSll
CLD: BKN SC 250018000 FT AGL
FZLVL: 3000 FT AGL
h4NM QNH: 1004 HPA
SEA: T15 HGT 5M
VA: NIL
Meaning: An area forecast for low-level flights (GAMET) issued for sub-area two of the
Amswell* flight information region (identified by WCC Amswell area control centre)
for below flight level 100 by the Donlodnternational* meteorological office (YUDO);
the message is valid fiom 0600 UTC to 1200 UTC on the 22nd of the month.
Section I:
surface wind speeds: between 1000 UTC and 1200 UTC 65 kilometres per hour;
surface visibility: between 0600 UTC and 0800 UTC 3 000 metres north of 51 degrees north (due to
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