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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Oz Insight Lab Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
A bomb cyclone, or explosive cyclogenesis, is a rapidly intensifying low-pressure system that can bring dangerous winds and heavy rain; for Australians, these systems most often affect the Southern Ocean and Tasman Sea from May to October, making sea travel treacherous and coastal warnings critical.
How does a bomb cyclone form and where do they occur?
Bomb cyclones occur when a mid-latitude low deepens by at least 24 hectopascals in 24 hours. They develop over the Tasman Sea and Southern Ocean, especially during cooler months. While mainland Australia rarely sees a full bomb cyclone, the system can produce intense cold fronts, gale-force winds, and heavy rains for southeast Australia and the south-west coast.
What should Aussie travellers watch for?
If you’re planning a coastal trip or a sea voyage between June and September, check the Severe Weather Warning page regularly. A bomb cyclone in the Tasman can cancel ferries and cause hazardous surf from Sydney to Hobart. For inland travellers, the associated cold front often brings damaging winds and sudden temperature drops—pack windproof layers and a sturdy jacket.
Can a bomb cyclone hit mainland Australia directly?
Rarely, because bomb cyclones are most common over open oceans. However, the associated fronts can bring severe wind warnings and heavy rain to the south-east coast, particularly Victoria and Tasmania. Always check the live ranking above for current alerts.
How long does a bomb cyclone last?
The explosive intensification phase lasts about 24–36 hours. The low then slowly weakens, but dangerous winds and swells can persist for several more days. Keep an eye on Weather Radar for the latest satellite and wind maps.
What’s the best way to stay updated during a bomb cyclone event?
Use the Bureau of Meteorology’s warnings and follow the live ranking above for real-time intensity comparisons. Also check Qld Weather Warnings if you’re near the Coral Sea, as bomb cyclones can occasionally develop further north.