“A button wasn't pushed, and the sirens were not deployed,” the mayor said. [...] There was a failure, a human failure, a failure in protocol to get the sirens up and running to let the community know that there was a massive weather event hitting our community.”
https://www.stlpr.org/government-politics-issues/2025-05-19/st-louis-tornado-siren-failure-was-a-result-of-human-error-spencer-says