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.
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
04:00, 10:00, 16:00 and 22:00 Hong Kong time (corresponding to the observation time at 02:00, 08:00, 14:00 and 20:00
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