Wind Regions in Australia: Classifications, Explanation & Map
In Australia, wind regions vary significantly due to the vast range of climates and weather conditions across the country. Ensuring the safety and integrity of structures on your site is crucial, especially in places prone to tropical cyclones and wind gusts. Extreme weather conditions and fluctuating wind speeds significantly impact wind region classifications. Therefore, builders, engineers and property owners must thoroughly understand these classifications when designing a structure. By adhering to Australian standards, operations with compliant structures across the country can mitigate risks, protect assets and safeguard people’s livelihoods.
Understanding Wind Regions in Australia
Australia has been divided into four wind regions to help builders, engineers and property owners better understand the varying wind speeds and risk factors:
Wind Region A
Most of Australia falls into this wind region with moderate wind speeds being its primary characteristic. This region also has subcategories of A0 to A5, which account for factors such as prevailing wind direction.
Wind Region B
Much of the coastline falls under classification B, as the coastal areas experience higher wind speeds than Region A.
Wind Region C
Cyclone-prone regions, particularly in the northern parts of Western Australia, Northern Territory and Queensland experience very high wind speeds.
Wind Region D
These regions in specific parts of the coast in Western Australia experience the most extreme weather conditions out of the four and are known for being the most cyclonic region.
The Significance of Wind Speeds
Wind speeds are measured in kilometres per hour (km/h) or metres/second (m/s) and significantly impact the building design and construction. The higher the wind speed, the stronger and more resilient a structure needs to be to withstand extreme weather events and prevent structural damage. Engineers designing structures must calculate the design wind speeds to be used according to the requirements of the Australian Standard for Wind Actions AS/NZS1170.1:2021. This review ensures that each structure is precisely engineered to suit local conditions. Engineers will also consider factors such as design life, type of use, and terrain category when determining the design for each wind region.
WHAT ARE THE WIND REGIONS IN AUSTRALIA?
Wind regions are derived from the Australian Standard AS/NZS 1170.2:2021. The map is colour-coded according to their respective wind regions with grey & white being wind region A that covers most of the inland, southern, and central parts of Australia. The orange parts are for wind region B that generally covers coastal areas, blue for wind region C that covers the northern coastal parts, and red for wind region D that covers a small part of the coastal area that is most cyclone-exposed. The boundaries are usually drawn inland from the coast, and coastal regions usually have a higher classification for the wind region.
Before building a structure, you must find out the wind region of your structure’s location to align your structure’s build and materials to comply with the Australian Standard AS/NZS 1170.2:2021. The list of suburbs with their respective wind region is detailed below:
Region A(Normal) | Region B(Intermediate) | Region C(Cyclonic) | Region D(Severe Cyclonic) |
| Perth Albany Newman Tom Price Fitzroy Crossing Halls Creek Green Head Morawa Wittenoom Adelaide Port Augusta Woomera Alice Springs Katherine Mt. Isa Emerald Moranbah Blackwater Charters Towers Kingaroy Sydney Wollongong Tamworth Wagga Wagga Canberra | Norfolk Island Corindi Brisbane Gold Coast Biloela Adelaide River Coramba Grafton Lismore Gympie Maryborough Biggenden Gandah Mt. Morgan Stanwell Epsom Atherton Moreton Ivanhoe Kimberley Downs Marble Bar Nanutarra Mullewa Threesprings Leeman | Bundaberg Rockhamptom Mackay Townsville Cairns Moreton Karumba Borroloola Darwin Wyndham Derby Broome Geraldton Wannoo Pannawonica Wyndham Burketown McDonnell Creek Weipa Normanton Townsville Bowen Proserpine Mackay Gladstone | Port Hedland Carnarvon Pardoo Karratha Exmouth Coral Bay Sandfire |
Australian Standards (AS/NZS 1170.2:2021)
AS/NZS 1170.2:2021 is the Australian/New Zealand standard for structural design actions, specifically focusing on building restrictions for specific wind regions. The Australian standard offers guidelines for calculating wind loads on structures, considering factors such as wind speed, terrain and building shape. It ensures that structures remain stable and reliable under expected wind speeds for their region, improving overall safety and structural integrity.
Implications for Construction and Shelter Selection
There are similar required standards for job sites to ensure the safety and structural soundness of temporary shelters. In high-wind regions such as Regions C and D, structures must be able to withstand extreme weather and cyclones. Factors such as building height, shape and materials can all greatly affect the structural integrity.
When choosing a structure for your job site, the terrain category and wind region are a primary consideration as they can be greatly affected and could potentially collapse if the correct shelter is not chosen. A wind-rated shelter tailored to your climate and terrain ensures equipment protection, employee safety, and cost avoidance for repairs, replacements, or downtime. Non-wind-rated shelters pose risks of damage, injury, and financial loss, as insurance claims may be denied for improperly rated shelters; most critically, a failed shelter can cause injury or loss of life.
This is why it is increasingly important to use certified materials and proven construction methods to ensure the longevity and safety of a structure. Adhering to Australian standards, such as AS1170.2:2021, guarantees the use of proper construction techniques and quality building materials, providing reliable protection and durability. Certified materials like Australian steel and high-quality fabric, as found in Allshelter’s dome shelters, ensure optimal performance even in high-risk locations.
A collapsed non-wind-rated shelter
Why Fabric Shelter Wind Ratings are Important:
All construction projects or temporary structures in Australia must be compliant with the AS/NZS 1170.2:2021. This standard ensures that buildings will be properly constructed to withstand the local wind conditions, helping to reduce the risk of structural failure. Choosing not to follow the Australian standards can lead to severe legal consequences, structural damage, financial loss and putting people’s lives at risk.
Allshelter’s Successful Shelter Applications
Allshelter is dedicated to ensuring safety and structural excellence with its fabric shelters. Designed to exceed AS1170.2:2021 standards, Allshelter’s container domes and shelters have been engineered with specific wind ratings tailored to different wind regions across Australia. Each shelter is constructed to tackle the unique challenges posed by its terrain and wind region category.
The design wind speeds used are categorised as follows, guaranteeing the structural integrity of the shelters even in the face of the fiercest winds:
Category A: 147.6 km/h
Shelters built in this region are used in most of Australia with minimal threat of cyclonic activity.
Category B: 177.5 km/h
Shelters built in this region must be able to withstand wind speeds of up to 177.5km/h.
Category C: 204.5 km/h
Shelters built in this region can withstand most ordinary cyclones with wind speeds of up to 204.5 km/h.
Category D: 247.7 km/h
Shelters built in this region need to be engineered and designed for winds up and over 247.7 km/h, even the endwalls and the doors! This makes up a very small area of Australia and these areas are prone to severe tropical cyclones.
NOTE: These values are nominal. The design wind speed for a specific location varies according to design life, Importance level (IL), and Terrain category (TC) etc.
Engineered with stringent wind ratings, our shelters provide unparalleled protection for valuable assets and personnel on site, providing peace of mind during extreme weather conditions. These shelters have been rigorously tested and proven effective, serving as a reliable solution for job sites across Australia. By meeting Australian standards, Allshelter guarantees the highest protection and structural integrity level, safeguarding your assets and personnel no matter the weather or condition.
A wind-rated shelter by the West Coast where winds can reach 288.3km/h.
Conclusions
Understanding the wind regions of Australia is crucial for ensuring that your building codes and structural designs meet the highest standards for both temporary and permanent structures. Compliance with AS/NZS 1170.2:2021 is essential for withstanding local wind conditions, enhancing safety and operational efficiency. Proper planning, investment in certified materials and robust construction techniques serve as your best strategy in achieving this goal. Prioritising these areas can significantly reduce the risk of catastrophic failures and protect lives and property.
For tailored advice and solutions to specific construction challenges, consulting with experienced professionals is invaluable. They provide expertise that can make all the difference in your project’s success. By adhering to these principles, you can ensure your structures are resilient, reliable, and well-prepared to withstand Australia’s diverse wind conditions and terrains.
A wind-rated dome shelter onsite.
Resources & ReferenceS
To deepen your understanding of wind region and terrain classifications, there are several resources available, there are several resources available, including data from the Bureau of Meteorology. For example, Australian standard documents, such as AS1170.2:2021 and AS/NZS 1170.2:2021, offer comprehensive guidelines, while tools like wind load calculators and structural design tools provide practical applications. Leveraging these resources will help build a foundation for constructing structures that are safe, durable, and compliant with Australian standards. For further assistance or inquiries, our friendly specialists are also here to help with any enquiries you may have.
