Data product | Project Tropical Cyclone Hazard Assessment (TCHA)

  • Identify local and regional areas that are at high threat to cyclones and severe wind

  • Understand the likelihood and expected intensities of tropical cyclones

  • Access thousands of event scenarios for better planning

  • Formulate cyclone impact models for your region 

  • Create evidence-based evacuation plans and mitigation strategies 

three people stand at a table looking at cyclone tracking maps. One of them points to a point of interest on the top map.
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Defining the severe wind hazard threat posed to Australia

The TCHA provides an evaluation of the likelihood and intensity of the occurrence of tropical cyclone winds across the Australian region, covering mainland Australia, islands and adjacent waters.

Image of the display screen of the tropical cyclone scenario selector tool, which displays toggle tools beside a map of Australia

Use TCHA18

Use our interactive tools for cyclone risk management, and to inform your research of the tropical cyclone threat in your area.

A hazard scientist stands at their desk while reviewing data on the computer screens and laptop.

Talk to us about your challenges

We continue to work with different sectors to provide assessments and address new challenges as they emerge.

Who is the TCHA for?

The TCHA provides vital information to emergency managers, town planners, infrastructure owners, and the insurance industry. It identifies local and regional areas that are at high threat to cyclones and severe wind.

It is also a key data source used in the development of local cyclone impact models. These are then used to inform disaster management and evacuation plans, infrastructure planning reports and mitigation strategies.

How the TCHA works

  • It uses Australian observations and data to determine how quickly tropical cyclones dissipate after landfall.

  • It uses the latest scientific methods to create realistically sized simulated tropical cyclones, analysing both intensity and latitude leads to more authentic modelling of a cyclone’s size over its lifetime.

  • It records precise details of each simulated tropical cyclone, including wind speeds and their locations around Australia, and the likelihood of extreme wind speeds, and records them in its event database.

  • It allows users to extract and examine individual tropical cyclone events, because it stores the wind field from each separate simulated tropical cyclone scenario.

  • Its event database allows users to separate hazard information into parts, so they can easily explore scenarios which may be relevant to their own communities.

Good to know

TCHA relates to tropical cyclone winds only. It doesn’t include other severe wind hazards, such as tornadoes, severe storms or cyclones that become storm events. Although this is standard practice for tropical cyclone hazard assessments and recognised internationally as an agreed methodology, it’s a key constraint and one the scientific community is addressing with research.

three people stand at a table looking at cyclone tracking maps. One of them points to a point of interest on the top map.

Three people stand at a table looking over cyclone tracking maps

Looking Forward

Geoscience Australia continues to update the TCHA, generally every four years.

The field of science and technology is constantly evolving and improving, and it’s important to incorporate best practice and evidence-based science in our knowledge. TCHA strives to reflect these advancements so Australian communities are as safe as possible from tropical cyclone events.

It’s likely that TCHA will be considered in future revisions to the Australian Standards on wind loading. This will ensure buildings and infrastructure in Australia are built to withstand tropical cyclone events.

High density housing along the isthmus in Perth, Australia. The image is taken at golden hour as seen by the pink lit sky and ocean

Case study Assessing and improving Western Australia’s vulnerability to tropical cyclones

How scenario modelling helped emergency managers in Western Australia to mitigate the impacts of tropical cyclone hazards.