A test of the All Island Public Warning System will take place this morning.
The sirens - around 31 sites across the Island will sound a steady note for 30 seconds at 11am.
If it were a real emergency the sound would continue for a further two and a half minutes.
The public are being reminded its just a routine test to make sure all is working properly.
Road closed after crash
Worries about fire pollution in Glen Maye
UK businessman wants to hear about mobile signal at sea
Minister quizzed over new Meat Plant director
Yellow weather warning this weekend
Education boss retires
Steam Packet warns of sailing delays today
Know someone who's made a difference to their community?