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Typhoons
The Hong Kong Observatory uses numbers 1, 3, 8, 9 and 10 to signify the strength of a tropical cyclone in the vicinity of Hong Kong.

When the No.8 signal is issued, winds are normally expected to reach gale force generally in Hong Kong within 12 hours after No.8 signal replaces No.3 signal. The Observatory will make a pre-No.8 special announcement when the No.8 signal is expected within two hours.


Rainstorms
There are three levels of warning: AMBER, RED and BLACK. The RED and BLACK signals warn the public of heavy rain which is likely to bring about serious road flooding and traffic congestion.

The weather warning signals will trigger response actions by Government departments and major transport and utility operators. The public will be given clear advice on the appropriate actions to take. Once issued, the signals are broadcast over radio and television.


Bad Weather Arrangement

 Typhoon Signal
 No. 1 or No. 3

 

 The Conference remains open

 Pre-Typhoon Signal No. 8

 or

 Typhoon Signal No. 8
 or above

 Issued during the Conference

 The Conference will close in 1 hour,
 participants will be requested to leave

 Issued at or before 7:00am

 The Conference will be closed for the morning session
 (9:00am to 2:00pm)

 Cancelled at or before 12:00pm

 The sessions after 2:00pm will be resumed

 Cancelled after 12:00pm

 The Conference remains closed

 Amber or Red Rainstorm
 Warning Signal

 

 The Conference remains open

 Black Rainstorm
 Warning Signal

 Issued during the Conference

 The Conference remains open

 Issued at or before 7:00am

 The Conference will be closed for the morning session
 (9:00am to 2:00pm)

 Lowered at or before 12:00pm

 The sessions after 2:00pm will be resumed

 Lowered after 12:00pm

 The Conference remains closed

The organiser will make announcement via email / at the venue to inform delegates and exhibitors of the bad weather arrangement.