If you experience rising floodwaters, evacuate immediately—don't wait for an alert
Once a year, New Zealand pauses to rehearse the sound of urgency — a tone that cannot be silenced, designed to reach nine in ten citizens wherever they stand. Tonight marks the ninth such rehearsal of the Emergency Mobile Alert system, a geotargeted broadcast that bypasses individual consent in service of collective survival. It is a reminder that some tools exist not for comfort, but for the rare and terrible moment when speed is the only thing that saves lives.
- At some point between 6 and 7 p.m. tonight, nearly every mobile phone in New Zealand will emit a loud, jarring alert — and there is no way to stop it in advance.
- The sound is intentionally disruptive: it overrides silent mode, cuts through distraction, and is calibrated to a global standard that prioritises attention over comfort.
- Police have advised those who want to avoid the noise to switch spare phones to flight mode or turn them off entirely during the test window.
- The system's geographic edges are imprecise — tower boundaries mean some people outside the target zone may receive the alert, while others inside it may not.
- NEMA will publish a coverage map on June 19, part of an ongoing effort to build public trust in a system that reserves its voice for only the most severe emergencies.
- Officials stress that the alert is a complement to human instinct, not a replacement — if you see floodwaters rising or feel a strong coastal earthquake, evacuate without waiting for your phone to tell you.
Tonight, New Zealand's mobile phones will sound an alarm most people cannot silence. It is the ninth year Civil Defence has run this nationwide test, reaching roughly nine in ten New Zealanders — either directly or through someone nearby. The Emergency Mobile Alert system broadcasts geotargeted signals to every handset connected to a cellular tower in a chosen area. There is no opt-out.
The system exists for a single purpose: when a severe and certain threat to life emerges — a tsunami, a flash flood, a landslide — emergency services can reach entire regions instantly. The test runs between 6 and 7 p.m. Police have advised that the only reliable way to avoid the sound is to switch a phone to flight mode or turn it off entirely. The alert overrides silent mode. The loudness is deliberate — it is designed to cut through distraction, and it cannot be made gentler. NEMA's answer to that question is simply: no.
What the system does not do is replace human judgment. NEMA's John Price was direct: follow MetService forecasts, stay connected to local Civil Defence, and trust what you observe. If floodwaters are rising or the ground shakes hard near the coast, evacuate immediately. Do not wait for an alert.
The broadcast works through geography, not phone numbers — Civil Defence does not hold individual contact details. But the system has soft edges: tower boundaries vary by provider, so some phones just outside a zone may still receive the message, while others inside it may not. On June 19, NEMA will publish a map showing exactly where tonight's test alerts were sent, part of a broader effort to keep the system transparent.
Real emergency warnings — for earthquakes, floods, severe weather — will come through this same channel, but only when circumstances are grave enough to warrant it. Tonight is a rehearsal: a chance for the system to prove it works, and for the nation to remember what it means when their phone screams.
Tonight, New Zealand's mobile phones will sound an alarm that most people cannot silence. It's the ninth year Civil Defence has run this nationwide test, and it will reach roughly nine out of every ten New Zealanders—either directly or through someone standing nearby. The alert arrives as a geotargeted broadcast, a signal that spreads to every handset connected to a cellular tower in a chosen area. There is no way to opt out. There is no way to silence it in advance.
The Emergency Mobile Alert system exists for one purpose: when a severe, urgent, and certain threat to life emerges—a tsunami after a strong earthquake, a flash flood, a landslide—Civil Defence and emergency services can reach people instantly across entire regions. John Price, speaking for the National Emergency Management Agency, calls it a valuable life safety tool. The test runs between 6 and 7 p.m. tonight. Police have already issued guidance on social media: if you own a second phone and want to avoid the sound, turn it off or switch it to flight mode during that window. The alert overrides silent mode on most devices. The only reliable way to escape the noise is to disable the phone entirely.
This matters because the alert is intentionally jarring. It's designed to cut through distraction, to make people pay attention. The sound is based on a global standard used in other countries with similar systems. It cannot be made gentler or more pleasant. NEMA has fielded nine frequently asked questions about tonight's test, and the answer to "Can you make it a nicer sound?" is simply no. The loudness is the point.
What the system does not do is replace human judgment. Price emphasized this directly: people should listen to the radio, follow MetService forecasts, stay connected to their local Civil Defence Group, and most importantly, trust what they see and feel. If floodwaters are rising, if the ground shakes strongly near the coast, if the earth shows signs of sliding—evacuate immediately. Do not wait for an alert. The alert is a tool, not a substitute for the instinct that tells you danger is near.
The broadcast reaches phones through a geographic net, not through individual phone numbers. Civil Defence does not have your number. Every phone connected to a tower in the target area receives the message once. But the system has soft edges. Cell towers for different providers sit in different locations, so some phones on the "safe" side of a boundary may still receive the alert, while others just inside the zone might miss it. If you're traveling and cross into a new tower's range, you might receive the same message twice. If your phone recently updated its software, the alert might appear again because the device doesn't recognize it as already received.
On June 19, NEMA will launch a map showing exactly where the test alerts were sent. This is part of the broader effort to make the system transparent and trustworthy. The real emergency warnings—for thunderstorms, for earthquakes, for flooding—will come through this same channel, but only when circumstances are severe enough to warrant it. Not every weather warning triggers an EMA. MetService, the statutory weather authority, handles routine forecasts. Civil Defence reserves the alert for moments when speed and reach matter most.
Tonight's test is a rehearsal for that moment. It's a chance for the system to prove it works, for people to hear what the alert sounds like, and for the nation to remember that when their phone screams, it's because someone believes they need to know something immediately. The test will end by 7 p.m. After that, the system waits—ready, but quiet.
Notable Quotes
The EMA system is a valuable life safety tool, but it's only one of many ways to alert people in emergencies. People should listen to the radio, follow MetService, and most importantly, trust their danger sense.— John Price, National Emergency Management Agency
If you experience rising floodwaters, a long or strong earthquake near the coast, or signs of a landslide, don't wait for an alert—evacuate immediately.— John Price, NEMA
The Hearth Conversation Another angle on the story
Why can't people just turn off the alert sound like any other notification?
Because in a real emergency, silence is the enemy. If you could mute it beforehand, people might not hear it when a tsunami is coming. The system overrides your phone's silent mode on purpose.
So there's genuinely no way to opt out?
None. It's treated like a public safety broadcast, not a service you subscribe to. The logic is that you can't consent your way out of needing to know about a tsunami.
What happens if you're on the border between two alert zones?
You might get the alert even though you're technically safe, or miss it even though you're in danger. Cell towers don't line up perfectly with geographic boundaries. It's one of the system's real limitations.
If Civil Defence doesn't have my phone number, how do they know where to send it?
They don't target individuals at all. They target towers. Every phone connected to a tower in the broadcast area gets the message. It's more like a radio broadcast than a text message.
Why do they need a test every year?
To make sure the infrastructure still works, to remind people what the alert sounds like, and to measure how many people actually receive it. Nine out of ten New Zealanders getting the message is the baseline they're aiming for.
But what if someone doesn't trust the alert? What if they ignore it?
That's why Price kept saying people need to trust their own senses first. If the ground is shaking violently near the coast, you evacuate. You don't wait for a message. The alert is backup, not the primary warning system.