The Public Warning System (PWS) Various Signals ... - SCDF

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The Public Warning System (PWS) Various Signals & Meanings

The Public Warning System will be used to warn of attacks from the air, land or sea, as well as natural and other man-made disasters. The table below shows what the various signals mean. It would be a good idea to memorise them.

Click on the "Play" button of the different types of Public Warning Signals to hear how it sounds

Signals How It Sounds* Situation What It Means
"Alarm " Signal This is sounded when an air raid or shelling is imminent. Move to a shelter immediately.
"All Clear " Signal This is sounded when the threat is over. You can leave the shelter.
"Important Message " Signal This is sounded to alert the population to an important broadcast on the radio. Tune in immediately to any local FM radio station or TV channel.

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