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GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
c. Defence Weather Service Office (DWSO). DWSOs provide
forecasts and warnings for at least the local aerodrome. They
also supply and display meteorological information and
provide briefing and documentation for military aircrew.
d. Meteorological Watch Office (MWO). MWOs are located
within all RFCs and at Canberra and Townsville MOs. They
maintain watch over meteorological conditions affecting flight
operations in assigned areas and prepare and disseminate
SIGMET information relating to these areas.
e. Meteorological Office (MO). MOs provide a range of
observing and forecasting functions. In particular, local
aviation forecasting services are offered at Alice Springs,
Cairns, Canberra, Rockhampton, Port Hedland, Launceston
and Townsville. The primary role of other Meteorological
offices is the taking, recording and transmission of surface and
upper air observations. They do not provide meteorological
briefing services to pilots, but may assist, if required, in
explaining the meaning of terms used in forecasts. With prior
notice, some of these offices may be able to assist in arranging
to have documentation available.
f. Airport Meteorological Unit (AMU). Currently, the only AMU
in Australia is located at Sydney Airport. Its main function is to
provide meteorological services for Sydney Airport and
support for air traffic services, and users of Sydney Airport. It
provides a telephone briefing service only.
2.2 Meteorological information is available by telephone and
electronic briefing systems from the Brisbane Briefing Office.
Documentation is also available by facsimile (see ERSA GEN for
details).
2.3 METAR, SPECI, TTF and TAF will generally be encoded using the
international weather code listed at Section 13. When these
messages are passed to pilots verbally, limited plain language will
be used. See Section 12. for other details relating to the decoding
of aerodrome weather forecasts.
2.4 ATS Meteorological Information Service. The ATS
meteorological information service is contained within the Flight
Information Service (FIS) described in GEN 3.3 Section 2.
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GEN (GENERAL) A/L 45 effective 24 NOV 05
3. AVIATION FORECASTS
3.1 Area Forecasts for Operations at or below FL200
3.1.1 These domestic forecasts are issued in narrative form for aircraft
operations at or below FL200. They comprise a statement of the
general synoptic situation and the meteorological conditions
expected to prevail in the designated area. They are prepared and
issued for the area as detailed on AUS PCA, at times covering
periods set out in para 18.2, using abbreviations detailed in para
18.3. A route forecast is issued for any part of a planned flight for
which a routine area forecast is not prepared.
3.1.2 These forecasts are available from the ATS automated briefing
systems and briefing offices listed in ERSA GEN.
3.2 Area Forecasts for Operations Above FL200
3.2.1 These forecasts are issued in chart form for aircraft operations
above FL200. They are issued for the area and at times covering
the periods set out in Section 19., and utilise symbols and
abbreviations to depict significant meteorological conditions, and
grid-point winds and temperatures as detailed in para 21.
3.2.2 They are available from the ATS automated briefing systems
AVFAX, DECTALK, ATS briefing offices by telephone or facsimile,
and MET offices.
3.2.3 Operators may be issued with the following data and/or charts:
a. grid point forecast,
b. route sector wind and temperatures,
c. significant weather charts, and
d. upper air charts.
3.3 Aerodrome Forecasts
3.3.1 Aerodrome forecasts (TAF and TTF) are a statement of
meteorological conditions expected for a specified period in the
airspace within a radius of five (5) nautical miles of the centre of the
aerodrome runway complex.
3.3.2 The TAF service provided is in accordance with the airfield
category, the category of airfield being determined by the type and
the amount of traffic.
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GEN (GENERAL) A/L 45 effective 24 NOV 05
3.3.3 Category description and service are as follows:
Category Aerodrome Type TAF Service
1 International. Issued 6 hourly, valid for 18 or 24
hours – continuous MET watch
and amendment service.
2 Domestic, with more than
500 movements per
month.
Issued 6 hourly, valid for 12 hours
– MET watch and amendment
service during validity period.
3 Other selected domestic
(with IAL procedure) and
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