The flood warning sounds like

[mickyhoss]

This is the sound

When you hear the flood warning
You and your family must take cover

Ow, ow, ow
Ow, ow
Let's go

 

[Yorkfox]

Do not attempt to rescue friends, relatives, loved ones
You have only a few seconds to escape use those seconds sensibly or you will inevitably die
Do not panic
(Do not panic)
Think only of yourself
(Only yourself)
Think only of yourself
(Only yourself)