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selected remote
aerodromes as per list
GEN 3.5 Section 16.
Issued as required or upon
request [Eight (8) hours notice is
required]. Valid to 12 hours –
MET watch and amendment
service during validity period.
4 Other locations. No TAF except for SAR or Mercy
flights on request.
NOTE: The contents of a TAF, and locations for which TAFs are
issued and their categorisation, are shown at Sections 15. and 16.
respectively.
3.4 Trend Type Forecast (TTF)
3.4.1 TTFs are prepared for the following locations:
Adelaide, Amberley, Brisbane, Darwin, Cairns, Canberra, East
Sale, Melbourne, Nowra, Oakey, Pearce, Perth, Port Hedland,
Rockhampton, Sydney, Townsville and Williamtown.
Note: The provision of TTF at some aerodromes is limited to
routine flights only. METAR/SPECI is normally available outside
these hours.
3.4.2 TTF is defined as an aerodrome weather report (METAR/SPECI)
to which a statement of trend is appended. The TTF relates to
weather conditions expected to affect the aerodrome of origin for
three hours following the time of the report.
3.4.3 The TTF supersedes the TAF for its validity period of three hours
commencing at the time of the observation and is the current
forecast for pilots of aircraft whose arrival time falls within the
three-hour period. For aerodromes where the TTF service is not a
24 hour service, or the meteorological watch ceases, the TAF will
supersede the remaining portion of the TTF validity for which a
meteorological watch is not available. The time at which the TAF
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
supersedes the TTF will be included in the remarks section of the
TTF.
Note: For pilots whose arrival time falls outside the three-hour
period, the TAF is the current forecast.
3.4.4 Where applicable, TTF replaces TAF and present weather in
VOLMET broadcasts.
3.5 Provisional Forecasts
3.5.1 Forecasts may be prefixed PROV (to denote provisional) when
considered likely to be deficient in accuracy because origination
was by a forecasting office issuing information for a location or
area not under its authority.
Note: The Director of Meteorology may, however, authorise the
issue of provisional TAF in additional circumstances.
3.5.2 Provisional aerodrome forecasts will be confirmed or amended as
soon as possible.
3.6 Significant Forecast Abbreviations and Terms
3.6.1 In reports, forecasts and low level area forecasts, the amount of
cloud will be indicated by the following abbreviations:
SKC or, if appropriate, CAVOK = No cloud
FEW = 1 to 2 OKTAS
SCT = 3 to 4 OKTAS
BKN = 5 to 7 OKTAS
OVC = 8 OKTAS
3.6.2 The only cloud types that are included in aeronautical code format
are towering cumulus (TCU) and cumulonimbus (CB). Forecasts
in narrative form, such as low level area forecasts, will continue to
include cloud types other than CB and TCU when appropriate.
3.6.3 In the case of CB cloud, the amount will be indicated in
“non-aerodrome” type forecasts as follows:
ISOL – ISOLATED – for individual CBs
OCNL – OCCASIONAL – for well-separated CBs
FRQ – FREQUENT – for CBs with little or no
separation
3.6.4 GOOD is used in the visibility section of low level area forecasts to
indicate a visibility greater than 10KM over the entire area. When
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
weather elements are forecast to reduce the visibility below 10KM,
GOOD is replaced by those elements and their associated
visibilities. Note that the visibility remains greater than 10KM in
parts of the area unaffected by those elements.
3.6.5 TEMPO and INTER are used to indicate significant variations of a
temporary or intermittent nature in aerodrome and landing
forecasts:
a. TEMPO is used to indicate change in prevailing conditions
expected to last for a period of less than one hour in each
instance.
b. INTER is used to indicate changes expected to occur
frequently for periods of less than 30 minutes duration, the
conditions fluctuating almost constantly, between the times
specified in the forecast.
3.6.6 FM is used in forecasts to indicate changes which are significantly
different to preceding information in one or more of the elements:
wind direction and/or speed, visibility, weather or cloud. The
changes relate to improvements as well as deteriorations. The
forecast conditions commencing with the code “FM” will continue
until the end of the TAF validity period, or until replaced by another
　
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