The size in terms of radius of the 'Potential Track Area' corresponding to different forecast hours are determined from the error statistics of the forecasts issued in past years (updated in 2022) and are as shown in the following table: It will be particularly larger beyond 72 hours and is indicated with lighter shadings on the map. The area grows as the forecast hour increases. Literally, it means that among 10 times of track forecast for similar situations, the tropical cyclone will be centred within the indicated area in about 7 times. By pressing the 'Potential Track Area' button, the probable area within which the tropical cyclone will fall with a probability of 70% will be shown. While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path of the storm.Please bear in mind the uncertainty of the tropical cyclone locations as described below in using this function. The user can use the controls on the left of the map to change the area of interest and to zoom into city or even street levels. Detailed information of the tropical cyclone, including latitude, longitude, classification and the maximum sustained wind near centre will be shown when placing the mouse cursor over the analysed or forecast positions.*The tropical cyclone track, analysed positions and maximum sustained wind near centre are based on Hong Kong Observatory's tropical cyclone warning for shipping.

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