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Rainstorm during the evening of 1 September and early morning of 2 September 2001

Under the influence of a trough of low pressure, heavy rain and squally thunderstorms affected Hong Kong during the evening of 1 September and the early morning of 2 September 2001, which necessitated the issuance of the Amber, Red and Black Rainstorm Warning Signals. It is the first issuance of the Black Rainstorm Warning Signal this year.

Over 100mm of rainfall were recorded over most part of Hong Kong during the period that the rainstorm warnings were in effect. The most seriously affected areas were Tsuen Wan, Kwai Chung, Sha Tin, and the western part of Kowloon where over 200 mm of rainfall were recorded. More than 150mm of rainfall were also recorded over Sai Kung and the northern part of the Lantau Island. The rainfall distribution for Hong Kong for the period is attached.

Rainfall distribution in Hong Kong from 5:30p.m. 1 September to 3:15 am 2 September 2001

The effective times of the signals issued for the rainstorm are as follows:

Amber Rainstorm Warning Signal

5:30 p.m. to 10:05 p.m. on 1 September 2001

Red Rainstorm Warning Signal

10:05 p.m. to 10:45 p.m. on 1 September 2001

Black Rainstorm Warning Signal

10:45 p.m. on 1 September 2001 to 3:15 a.m. on 2 September 2001

Landslip Warning

10:45 p.m. on 1 September 2001 to 10:00 a.m. on 2 September 2001

Special Announcement of Flooding in northern New Territories

10:50 p.m. on 1 September 2001 to 3:16 a.m. on 2 September 2001

Thunderstorm Warning

3:00 p.m. on 1 September 2001 to 6:00 a.m. on 2 September 2001

Under the influence of the trough of low pressure, there will be occasionally heavy rain and squally thunderstorms over Hong Kong tonight and tomorrow (3 September 2001). For the latest weather forecast, please refer to the following webpages:

http://www.weather.gov.hk/wxinfo/currwx/flw.htm (local weather forecast) and

http://www.weather.gov.hk/wxinfo/currwx/f5d.htm (5-day weather forecast).

Last revision date: <20 Dec 2012>