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

(a) First passage [17 – 18 July]

Station	Start time when strong wind speed* was attained		End time when strong wind speed* was attained
	Date/Month	Time	Date/Month	Time
Cheung Chau	17/7	19:11	18/7	09:38
Hong Kong International Airport	17/7	19:42	18/7	00:04

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.

(b) Second passage [23 – 24 July]

Station	Start time when strong wind speed* was attained		End time when strong wind speed* was attained
	Date/Month	Time	Date/Month	Time
Cheung Chau	23/7	15:40	24/7	00:38
Sai Kung	23/7	15:40	23/7	15:49

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.

* 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.