Coastal Aucklanders are advised not to be alarmed when the region’s tsunami sirens have one of their twice yearly tests at noon on September 24. Coinciding with the start of daylight savings, the test sequence will be three sets of tones, each signalling a specific action. They will sound for one minute each and there will be 15 seconds between each set. In an emergency, tones will sound for longer. The tsunami sirens in Upper Harbour are located in Westpark Marina, Hobsonville Airbase (Harrier Point) and Herald Island. To sign up for tsunami alerts, access tsunami zone maps, and make an emergency plan, visit aucklandcivildefence.org.nz and follow them on Twitter and Facebook.