Disaster data guides

Reading Australian tropical cyclone track maps

The forecast path of a cyclone centre is not the full area of possible impacts.

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What the official track map shows

The Australian Bureau of Meteorology's tropical cyclone warning guide explains its forecast track map. The shaded forecast area represents possible positions of the cyclone centre; it does not outline all wind, rain, surge or coastal hazards. The map also displays intensity and watch or warning zones, which answer different questions from the centre track. Read its issue time and forecast-valid time before comparing frames.

The Bureau's watch and warning areas describe expected gale-force wind timing for coastal communities. A place outside the likely centre track can still be affected. Conversely, a line crossing a locality is not by itself an instruction to evacuate. Use the complete official advice, including impact details and the relevant state or territory authority, for decisions.

Why a global storm point may differ

The PocketWorld storm overview is a global, provider-labelled event explorer. Its marker or track may summarize a storm and may use an observation or update cycle different from the Bureau's latest forecast. A single point cannot represent a wind field or a warning zone. If the two views disagree, check whether one is a historical position and the other a forecast, then compare valid times and source agencies.

Tropical cyclones can change direction and intensity. A forecast cone or shaded area represents uncertainty about the centre; it is not a promise that hazards will be confined to the shading. A retained global snapshot can persist during an upstream outage. An empty PocketWorld map is therefore not an all-clear for a coastal community.

A reliable comparison workflow

First find the current Bureau of Meteorology advice for the Australian region and identify the storm name, advisory time, forecast position and warning zones. Next read the local emergency service's guidance for your state or territory. Use PocketWorld only for wider geographic context and follow its linked source record. When sharing an image, say which line is observed, which is forecast, and when each was valid.

Rainfall, flooding and dangerous surf can matter beyond the track-map symbols. Inspect the hazard description rather than estimating risk from distance to a centre line. This guide explains map products; it does not assess a property, route or shelter. The PocketWorld methodology describes freshness and retained data, while official Australian agencies remain the source for alerts and action.

When a storm is renamed or reclassified, use its identifier and advisory history to follow the same system across maps. The Bureau's seasonal cyclone archive helps distinguish historical activity from current advice. Do not compare two screenshots solely by their displayed category: they may represent different valid times or different estimates of intensity. The official advisory chronology provides the safer comparison.

Data sources

References are linked beside the explanations above. This evergreen guide does not report current incidents.