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2018 National Tropical Cyclone Hazard Assessment

Created 16/10/2025

Updated 16/10/2025

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The 2018 Tropical Cyclone Hazard Assessment (TCHA18) provides an evaluation of the likelihood and intensity (“how big and how often”) of the occurrence of tropical cyclone winds across the Australian region, covering mainland Australia, islands and adjacent waters. It is a probabilistic evaluation of the expected maximum gust wind speeds with a range of annual exceedance probabilities (or conversely, average recurrence intervals). The assessment is derived using a statistical-parametric model developed by Geoscience Australia called the Tropical Cyclone Risk Model (TCRM). Maximum 0.2-second duration, 10-metre above ground wind speeds are calculated for Standard Australia's AS/NZS 1170.2 (2011) terrain category 2 (0.02 m roughness length) surface conditions, over a 0.02 degree grid across Australia. Maps of average recurrence interval (ARI) wind speeds of 100- and 500-year ARI are provided in a separate product suite.

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Additional Info

Field Value
Title 2018 National Tropical Cyclone Hazard Assessment
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/0a3a127e-58bb-48d5-96cd-d4ca6321cd47
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 04/05/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        100.0,
        -35.0
      ],
      [
        165.0,
        -35.0
      ],
      [
        165.0,
        -5.0
      ],
      [
        100.0,
        -5.0
      ],
      [
        100.0,
        -35.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "2018 National Tropical Cyclone Hazard Assessment". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/2018-national-tropical-cyclone-hazard-assessment