Tropical cyclones centred within the area bounded by 7-36N and 100-140E will be shown on this website. According to the analysed position of the tropical cyclone and the tropical cyclone warning signal in force, the update time of this webpage and the information shown will be different. Details are listed in the table below:
Tropical CycloneWarning SignalNo.1 or abovein force
No Tropical Cyclone Warning Signal in force
Tropical cyclonescentred within thearea bounded by 10Nand 30N, 105E and 125E.*
Other tropical cyclonescentred within thearea bounded by 7Nand 36N,100E and140E.
While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm. The yellow shaded area on the map indicates the probable area within which the tropical cyclone will fall with a probability of 70% ('Potential Track Area'). Literally, it means that in 10 times of track forecast for similar situations, the tropical cyclone will be centred within the indicated area in about 7 times. The area grows as the forecast hour increases. It will be particularly larger beyond 72 hours and is indicated with lighter shadings on the map. 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 and are as shown in the following table:
24-hour forecast position
48-hour forecast position
72-hour forecast position
96-hour forecast position
120-hour forecast position
In order to show the forecast track and intensity category of the tropical cyclone clearly, the track maps on this webpage may only display the time labels of some positions of the tropical cyclone. Users can visit the Geographical Information System (GIS) version of the webpage to display all the time labels on an interactive map.
Short-term erratic departures of the tropical cyclone from the general direction of movement may occur from time to time. These departures are partly due to uncertainties in locating the centre of the tropical cyclone, and partly due to actual short-term variations in the direction and speed of movement of the tropical cyclone itself.