The people killed in the early hours of a morning in the flash floods in Texas might have benefited from a warning, for example?
In 2021, flash floods in Germany killed 190 people. Around 200,000 people were told to evacuate Liege in Belgium as the river came extremely close to flash flooding the city centre.
Last year 232 were killed in flash floods in Valencia, Spain.
Before you say that doesn't happen here, flooding and extreme weather are likely to become more common in the UK. Tidal surges killed 307 people on one night in East Anglia in 1953. If you are asleep, you won't be checking your phone for alerts.
Hurricane/high winds: people still set off driving somehow oblivious to this and those are usually quite well forecasted.