At 3pm on April 23, an unusual warning sound was emitted from millions of phones across the UK. This was the first test of the government’s national emergency alert system, which will eventually be used to warn people about nearby flooding, fires and other hazards.
Work on this has been underway for several years, and as an expert in flood risks and climate change adaptation I have taken a keen interest and even published research on how the public might respond to these kinds of warnings. The UK’s Environment Agency does have an existing flood warning service, but up to now, it has relied on automated phone calls and text messages to people who have opted in to the service.
A warning system like the one used on Sunday – where everyone was automatically opted in, with no exceptions – would have been very helpful in many recent floods. For example, when Sheffield flooded in 2022 and many roads and car parks were quickly inundated, authorities would ideally have been able to alert everybody nearby rather than just those who had registered for flood alerts in that area.
