Tropical Cyclone Track
When a tropical cyclone forms within or enters the area bounded by 7-36N and 100-140E, the Observatory will issue the first tropical cyclone track within two hours.
1. When a tropical cyclone is located within the above area but outside the area bounded by 10-30N and 105-125E, the Observatory will update the tropical cyclone track at 10:00 and 22:00 Hong Kong time (corresponding to the observation time at 08:00 and 20:00 respectively). When the tropical cyclone is expected to enter the area bounded by 10N and 30N, 105E and 125E in about 24 hours, the Observatory will also update the tropical cyclone track at 04:00 and 16:00 Hong Kong time (corresponding to the observation time at 02:00 and 14:00 respectively).
2. Tropical cyclone warnings for shipping will be issued by the Observatory for tropical cyclones located within the area bounded by 10-30N and 105-125E. The forecast tracks for these tropical cyclones will be updated at 3-hourly intervals.