noun
emergency alert; emergency early warning
Refers to official emergency alerts sent to mobile phones, email, or broadcast systems, such as earthquake or tsunami warnings.
地震の直後に緊急速報がスマホに届いた。
An emergency alert arrived on my smartphone right after the earthquake.
緊急速報が鳴ったら、すぐに安全な場所へ避難してください。
When the emergency alert sounds, please evacuate to a safe place immediately.
Compound of 緊急 (emergency) and 速報 (breaking news / bulletin).