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7.4 Wind shear warnings are not issued.
Remark: Instruments required for the detection of wind shear are currently not available. They are
issued only if there is a notification by flight crews in the take-off and landing phases.
APPENDIX 3
2.3.2* b) Criteria for the preparation of special reports in the SPEC1 code form are determined in
accordance with meteorological minima established by the aviation authority for each aerodrome.
Remark: Criteria for the preparation of SPECI reports are determined by agreements implemented
through the coordination of ATS and MET authorities for each aerodrome.
* Recommended Practice
15/6/05
CHAPTER 2
2.2.3* Australia does not comply with IS0 9000.
2.2.4*
2.2.6*
CHAPTER 4
4.1.3 Runway visual range is provided in ATIS only and measured by human observers.
4.1.6*
4.3.2 a) Local routine and special reports are not issued. Information used in ATIS is provided by
4.4.2 a) authorized ATC.
4.5.1 i) Cloud type is not available in automated reports.
CHAPTER 5
5.3.1* No MET data are provided from ADS reports.
CHAPTER 6
6.3.3 Australia issues trend forecasts with 3 hours' validity.
6.4.1 TAF and TTF are used in Australia. No specific take-off forecast is issued.
6.4.3*
CHAPTER 9
9.1.2 Significant en route weather phenomena information is not always available for flights greater
9.1.3 than approximately 12 hours' duration.
9.4.1 *
APPENDIX 2
4.1.2* An alternate graphical format is used.
5.1* . Information is not always sent to alllany recommended recipients.
APPENDIX 3
2.1.2 The template is followed when elements are reported.
* Recommended Practice
2 AUSTRALIA SUPPLEMENTTO ANNEX3 (FIFTEENTEHD ITION)
2.3.2" a) 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.
b ? When the mean wind speed changes by 10 kt or more, the mean speed before or after the change
being 30 kt or more.
At aerodromes using the PANS-OPS procedures: when the horizontal visibility is at, below or
passes:
1) the highest alternate visibility
2) 6 km
3) 4 km
4) 2 km
5) 1 200 m
6) 800m.
At all other aerodromes, when the horizontal visibility:
- decreases to a value equal to or less than the alternate minimum;
- decreases to a value equal to or less than the circling minimum;
- increases to a value equal to or greater than the circling minimum;
- increases to a value equal to or greater than the alternate minimum.
RVR is not reported in SPECI.
SPECI is issued for the following additional weather criteria: - onset/cessation of fog (including shallow fog, fog patches and fog at a distance);
- onset/cessation of severe turbulence, severe icing, wind shear (of moderate or greater
intensity);
- the passage of a front;
- at the incidence of any other phenomenon likely to be significant to the operation of an
aircraft.
At aerodromes using PANS-OPS procedures: when a cumulative amount of BKN or more cloud is
at, below or passes:
a) the highest alternate minimum;
b) 300,500, 1 000 ft, in further 500 ft increments up to the highest alternate minimum.
At all other aerodromes, when the height of lowest cloud of amount BKN or more:
- decreases to a value equal to or less than the alternate minimum;
- decreases to a value equal to or less than the circling minimum;
- increases to a value equal to or greater than the circling minimum;
- increases to a value equal to or greater than the alternate minimum.
Highest alternate minimum in lieu of 450 m (1 500 ft) in Annex 3.
Local routine and special reports are not issued.
Significant change is defined as mean surface wind direction change by 30" or more, the mean
wind speed before or after the change being 20 kt or more or mean wind speed changes by 10 kt or
more, the mean speed before or after the change being 30 kt or more.
* Recommended Practice
SUPPLEMENTT O ANNEX 3 (FIFTEENTHE DITION) AUSTRAUA3
4.1.4.2 Directional variations are not reported in METMSPECI.
C) Gusts are only included in METMSPECI when SPEC1 criteria are reached, i.e. variation from a
mean speed of 15 kt or more by 10 kt or more.
e) Wind speeds and gusts of 100 kt and greater are reported in three figure groups.
4.3.2.2* RVR is determined by human observers.
4.3.6 RVR is not reported in METARISPECI.
4.5.4.1* f) NSC is not used.
APPENDIX 4
1.1.1 No MET data are processed from ADS reports.
2.7 Availability of humidity depends on the aircraft.
APPENDIX 5
1.2.1* Wind speeds and gusts of 100 kt and greater are included in forecasts.
1.2.3* Moderate or severe turbulence in addition to the phenomena are listed. The expression "NO
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