Tropical Cyclone Narelle is on course for a remarkable second intensification cycle this week, a meteorological occurrence that highlights both the unpredictability of extreme weather systems and the challenges they pose to emergency preparedness across Western Australia.
The system is forecast to cross the coast north of Broome into the Indian Ocean on Tuesday and almost immediately start re-intensifying, potentially reaching category 4 strength with wind gusts of up to 279 km/h by Thursday as it tracks along the WA coast past Broome and the Pilbara region.
What makes Narelle remarkable is that it has already crossed Australia twice. The system crossed the coast in far north Queensland on Friday as a severe category four, then slid west across the Gulf of Carpentaria before a second landfall in the NT as a category three. When it weakened to a tropical low over land, meteorologists anticipated it would simply continue its westward track. Instead, conditions are aligning for a dramatic resurgence.
The strategic calculus here involves several competing considerations. From the perspective of disaster preparedness, repeat intensification cycles create compounded challenges for emergency services. The weather system caused much less damage than expected when it crossed the Top End, and communities that weathered one passage now face the prospect of another threat. Kalumburu Aboriginal Corporation chief executive Kim Holm said the community's 300 residents were expecting heavy rain and wind when the system passed on Monday night, but nothing out of the ordinary for the wet season, noting that emergency services had been keeping them informed so there were no surprises.
The trajectory beyond Thursday presents genuine uncertainty that demands serious analysis. Senior meteorologist Jonathan How said the tropical cyclone is forecast to curve back towards the Western Australian coast and could impact places as far south as Perth, with the Bureau's modelling showing a range of paths including crossing the coast near Geraldton and south of Perth in WA's southwest. Forecast uncertainty remains regarding the exact track beyond March 26, particularly concerning any southward movement toward more populated coastal regions of Western Australia.
Historical precedent suggests caution. The most recent notable tropical cyclone to move down WA's west coast was Tropical Cyclone Seroja, which made landfall to the south of Kalbarri as a category three system in April 2021. Another notable system that impacted Perth was Ex-Tropical Cyclone Ned, which caused power disruptions and roof damage in the Perth region on April 1, 1989. While such events are uncommon, they are not unprecedented, and 14 systems that had been classified as tropical cyclones brought gale force winds or caused property damage in Perth between 1910 and 2024, with these damaging systems mostly occurring between January and May but most common in March.
The genuine complexity of this situation lies in the tension between preparedness and alert fatigue. Communities and emergency services must maintain heightened readiness without knowing whether Narelle will track offshore or make a significant inland push. This uncertainty is not a failure of forecasting; model track guidance remains in good agreement over the next 2 days with minimal along-track spread, but models begin to diverge after 2 days with cross-track spread increasing to 352 km at 3 days, with the cross-track spread rapidly widening after 3 days with AI models maintaining a sharper turn around the ridge axis while physics-based models show a wider turn.
For residents across northern and western Western Australia, monitoring official forecasts from the Bureau of Meteorology remains essential through the week. This is a rare occurrence for Western Australia and does not happen every single season, but when it does, the preparation window is narrow and the stakes are high.