Frequently Asked Questions

Accessing this Service

By entering this site, you acknowledge that this information is produced solely for use by the aviation industry, and you are aware that any information for the purposes of flight planning should be obtained from Airservices Australia.

How do I gain access to aviation meteorological information for flight planning?

Airservices Australia ( ) is the designated authority for the delivery of aviation meteorological information to aviation industry users. Information for the purposes of flight planning is typically obtained using Airservices' National Aeronautical Information Processing System (NAIPS) accessed at

Do I have to register to access aviation meteorological information on this site?

You do not have to register to access our aviation website, but when you enter the site you will need to acknowledge that you understand that any information for flight planning purposes is to be obtained from Airservices Australia, as outlined above. Access to Airservices Australia's NAIPS does require registration for a login and password, details of which can be found at

I would like information on interpreting aviation meteorological products such as TAF, TTF, METAR, SPECI, Area Forecasts and so on. Where can I find it?

Please visit the Knowledge Centre using the link on the Aviation home page. The Bureau's Aviation Weather Services have produced a range of comprehensive brochures to help users gain a good understanding of typical aviation products. These are in PDF format and can be printed for ready access.

Where can I find information on aviation weather phenomena and hazards?

A number of brochures have been produced which cover some of the more common aviation weather phenomena and hazards that can be encountered, together with some material on operating in particular regions and locations. These can be found in the Knowledge Centre section of this website using the link on the Aviation home page.

Where can I find the AWIS (Aerodrome Weather Information Service) telephone numbers and frequencies?

AWIS information can be accessed via the Location Info tab on the menu in this site.

What is the meaning of the AUTO group in METAR/SPECI?

Inclusion of the group AUTO indicates that the report is fully automated, i.e. there has been no human input to the message. Note that AUTO messages may include data from visibility, weather and cloud sensors.

What is the meaning of the NCD group in METAR/SPECI?

This group only appears in METAR AUTO, i.e. fully automated messages. The NCD group reports that there has been Nil Cloud Detected by the cloud sensor.

What is the meaning of the RF group in METAR/SPECI and TTF?

This group reports rainfall in the last ten minutes and accumulated rainfall since 0900 local. For example, RF02.2/024.4 reports that 2.2mm of rainfall has fallen in the 10 minutes prior to the report time; and 24.4mm has fallen since 0900 local.

Is it possible to access weather balloon data (temperature, moisture and wind) on your web site?

Upper temperature soundings are available in aerological diagram format via the 'Aviation Observations' tab on the menu in this site.

Is there information on this site that helps explain the Aerological Diagram?

Brochures on Vertical Stability of the Atmosphere and The Skew T-Log P Aerological Diagram in the Reference Material section of the Knowledge Centre help explain the Aerological Diagram.