2018 Tropical Cyclone Hazard Assessment - Recurrence Period 25 Years

Important: Due to the size of this dataset, this item may be slower to display. A file geodatabase of this product is also available to download at the following link: [Download: 2018 Tropical Cyclone Hazard Assessment (FGDB, 271MB)] Abstract The 2018 Tropical Cyclone Hazard Assessment (TCHA18) is a probabilistic wind hazard assessment which evaluates the likelihood and intensity of tropical cyclone winds across Australia. This includes the mainland Australia, nearby islands, and surrounding waters. It uses a method that estimates potential gust wind speeds based on the historical frequency of tropical cyclones in the Australian region. Wind speeds are calculated for recurrence periods from 5 to 10,000 years. The study uses a special model created by Geoscience Australia called the [Tropical Cyclone Risk Model] (TCRM). It calculates wind gusts at 10 metres above the ground, using standard surface conditions. These calculations are done across Australia on a detailed grid to help understand cyclone risks better. Currency Date modified: 9 April 2019 Modification frequency: As needed Data extent Coordinate Reference: WGS84 Spatial extent North: -5° South: -35° East: 165° West: 100° The Tropical Cyclone Risk Model (TCRM) used in the 2018 Tropical Cyclone Hazard Assessment (TCHA18) focuses on regions where cyclones have historically occurred and are statistically likely to recur. Areas south of latitude 35° south are generally too far from the tropics to experience direct cyclone impacts. As a result, the modelling and results in TCHA18 are limited to the region between latitudes 5° south and 35° south. Source information Data supplied and downloaded on 18 August 2025. Catalogue entry: [Product catalogue] Lineage statement The TCHA18 is an update to the previous Tropical Cyclone Hazard Assessment (TCHA14) and uses an updated version of TCRM. More information on the updates made to TCRM and a comparison of TCHA18 and TCHA14 are provided in the TCHA18 report. Tropical Cyclone Hazard Assessment 2018 Release document: [Tropical cyclone hazard assessment: 2018 release] ##### Data dictionary ───────────────────────┬────────────────────────────────────────────────────────────────────────────────── Attribute name │Description ───────────────────────┼────────────────────────────────────────────────────────────────────────────────── Raw Service Pixel Value│Represents the maximum wind speed (in km/h) for the recurrence interval. ───────────────────────┼────────────────────────────────────────────────────────────────────────────────── Class Name │Provides the hazard class that the maximum wind speed value is categorised within. ───────────────────────┴────────────────────────────────────────────────────────────────────────────────── Other relevant datasets * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 5 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 10 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 20 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 50 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 100 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 200 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 250 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 500 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 1,000 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 2,000 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 5,000 Years] * [2018 Tropical Cyclone Hazard Assessment - Recurrence Period 10,000 Years] Contact Geoscience Australia, [hazards@ga.gov.au]