Tropical Cyclone Information Bulletin

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Introduction

Tropical cyclone information bulletins are designed to provideinformation to people on existing cyclones that do not posea short-term threat to coastal communities in Australia.

When is a Tropical CycloneInformation Bulletin issued?

Tropical Cyclone Information Bulletins are issued whenevera tropical cyclone exists in Australian waters, but is notexpected to cause winds in excess of 62 km/h (gale force) overland in Australia* within 48 hours.

How often is a Tropical CycloneInformation Bulletin issued?

While the cyclone remains in Australian waters, but not expectedto cause land-based gales within 48 hours, a tropical cycloneinformation bulletin will be issued every six hours.

What Information is includedin the Tropical Cyclone Information Bulletin?

Each Tropical Cyclone Information Bulletin will consist ofthe following information:

  • The cyclone name (if it has been named)
  • The latest observed location of the cyclone centre
  • The expected developments (path and intensity)
  • A statement of longer term threats.

An associated track map may be issued.

Who is the target audience of Tropical CycloneInformation Bulletin?

All land based communities.
Note that separate marine warnings will be issued, and all mariners should referto these warnings for relevant information.

Where are Tropical CycloneInformation Bulletin issued?

Tropical Cyclone Information Bulletins are issued by RegionalOffices of the Bureau of Meteorology in Brisbane for CoralSea cyclones and Perth for Indian Ocean Cyclones. Tropicalcyclones in the Northern zone will be a threat to some landarea within 48 hours; hence Darwin does not issue TropicalCyclone Information Bulletins.

* If a cyclone is expected toaffect the east coast of Queensland, but not cross the coast, a watch orwarning will only be issued if winds over land are expected to exceed 75 km/h