Tropical Storm Son-Tinh (1809)

Periods during which sustained strong force winds were attained at the eight reference anemometers in the tropical cyclone warning system when tropical cyclone warning signals for Son-Tinh were in force

First passage [17 – 18 July]

At Cheung Chau , start time when strong wind speed was attained: 7:11 PM 17-Jul ;
End time when strong wind speed was attained : 9:38 AM 18-Jul ;

At Hong Kong International Airport , start time when strong wind speed was attained: 7:42 PM 17-Jul ;
End time when strong wind speed was attained : 12:04 AM 18-Jul ;

The sustained wind speed did not attain strong force at Kai Tak, Lau Fau Shan, Sai Kung, Sha Tin, Ta Kwu Ling and Tsing Yi Shell Oil Depot.

Second passage [23 – 24 July]

At Cheung Chau , start time when strong wind speed was attained: 3:40 PM 23-Jul ;
End time when strong wind speed was attained : 12:38 AM 24-Jul ;

At Sai Kung , start time when strong wind speed was attained: 3:40 PM 23-Jul ;
End time when strong wind speed was attained : 3:49 PM 23-Jul ;

The sustained wind speed did not attain strong force at Hong Kong International Airport, Kai Tak, Lau Fau Shan, Sha Tin, Ta Kwu Ling and Tsing Yi Shell Oil Depot.

Strong wind: 10-minute mean wind speed of 41-62 km/h

Note: The table gives the start and end time of sustained strong winds. Winds might fluctuate above or below the specified wind speeds in between the times indicated.