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SIGWX" is used instead of "NSW".
1.2.4* Vertical visibility is not forecast. There is no restriction on the number of cloud layers. NSC is not
used.
1.2.5* Forecast temperatures and QNH are available at intervals of three hours starting at the
commencement of the TAF validity up to a maximum of four forecast values. Temperature values
consist of two figure groups (preceded by the letter M if negative) prefixed by the letter "T", e.g. T
12 18 27 3 1. QNH values consist of four figure groups prefixed by the letter "Q", e.g. Q 1000 0998
0999 1002.
1.3.1* b) The following criteria are used: 800 m, 1 200 m, 2 km, 4 krn and 6 km, the highest alternate
minimum.
d) Moderate or severe turbulence in addition to phenomena listed.
e) When a cumulative amount of BKN or more cloud is at, below or passes: 300, 500, 1 000 ft, in
further 500 ft increments up to the highest alternate minimum.
h) Vertical visibility is not forecast.
1.3.2* BECMG is not used. Elements in addition to those for which a significant change is expected may
1.3.3* be included following the change indicator.
* Recommended Practice
APPENDIX 6
1.1.3
1.1.6*
Australia uses an additional change indicator "INTER". INTER is used to describe fluctuations
which are expected to last for periods less than 30 minutes in each instance, and which, in the
aggregate, are not expected to cover more than half the time. TEMPO defined in Australia is for
periods between 30 to 60 minutes.
FM followed by a two-figure time group in whole hours UTC.
The term INTER as defined in 1.3.4 is also used in probability forecasts.
Elements in addition to those for which a significant change is expected may be included
following the change indicator.
When the mean surface wind direction changes by 30" or more, the mean wind speed before or
after the change being 20 kt or more.
When the mean wind speed changes by 10 kt or more, the mean speed before or after the change
being 30 kt or more.
The following visibility criteria are used: 800 m, 1 200 m, 2 km, 4 km, 6 krn, the highest alternate
visibility.
Moderate or severe turbulence are also listed.
The expression "NO SIGWX" is used instead of "NSW"
When a cumulative amount of BKN or more cloud is at, below or passes: 300 ft, 500 ft, 1 000 ft,
in further 500 ft increments up to the highest alternate minimum.
Vertical visibility is not forecast.
The change indicator BECMG is not used. FM is used to indicate a significant change at the time
of the associated time group as in TAF. The term INTER as defined under 1.3.4 is used in trend
forecasts.
The abbreviation "TL" and "AT" are not used. FM is used to indicate a significant change at the
time of the associated time group as in TAF.
The period of temporary fluctuations with TEMPO and INTER is described by two four-figure
time groups indicating hours and minutes of start and end time, e.g. TEMPO 013510300.
TTF and TAF are used. No specific take-off forecast is issued.
FIRS are subdivided and sequence numbers refer to subdivisions.
SIGMET is not issued in BUFR.
* Recommended Practice
15/6/05
2.1.1 AIRMET format differs from Table A6-1 and consists of the identifier AIRMET followed by
2.1.2 dateltime UTC, the domestic forecast area identifier, validity and details of significant phenomena.
2.1.4 AIRMET is issued for cruising levels below FL120, variance as listed below:
surface wind speed - winds of 40 kt or more within 2 000 ft of ground level;
surfacevisibility - the initial onset of phenomena producing extensive areas of
visibility of less than 8 krn;
cloud - the initial onset of cloud coverage of BKN or more below 1 500 ft
above ground level.
APPENDIX 10
5.2.2* Aerodrome forecasts on VOLMET have a period of validity of 12, 18 and 24 hours and are issued
every 6 hours and amended as necessary.
* Recommended Practice
CHAPTER 1
Definitions Visibility. The maximum distance at which non-illuminated objects (reference points) can be seen
and identified during the day, and illuminated reference points can be seen and identified at night.
The term prevailing visibility is not used.
CHAPTER 2
2.2.2* The quality system is being developed.
2.2.3*
2.2.4*
2.2.5*
2.2.6*
CHAPTER 4
CHAPTER 5
5.3.1*
CHAPTER 6
6.4
The surface wind speed is indicated in metres per second (mls). At aerodromes where the
magnetic variation is 10' and more, the wind direction data, included in local routine (MET
REPORT) and local special (SPECIAL) reports, are corrected to the value of the magnetic
variation.
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