* United States color-coded war plans
* HANDEL
* Homeland Security Advisory System
* BIKINI state
* CONELRAD
* Four-minute warning
* Preparing for Emergencies (en)
* COGCON – Continuity of government readiness level
* Combat readiness
* Doomsday Clock
* HURCON – Hurricane Condition threat rating
* National Command Authority (United States)
* National Military Command Center
* National Terrorism Advisory System
* Waffle House Index – Unofficial disaster recovery metric used by FEMA
* UK Threat Levels – Similar British system used for terrorism threats (en)
