An emergency population warning is a method whereby local, regional, or national authorities can contact members of the public en masse to warn them of an impending emergency. These warnings may be necessary for a number of reasons, including: \n* weather emergencies such as tornadoes, hurricanes, and ice storms; \n* geological disasters such as earthquakes, landslides, volcanic eruptions, and tsunamis; \n* industrial disasters such as the release of toxic gas or contamination of river water; \n* radiological disasters such as a nuclear plant disaster; \n* medical emergencies such as an outbreak of a fast-moving infectious disease; and \n* warfare or acts of terrorism. Many local areas use emergency population warnings to advise of prison escapes, abducted children, emergency telephone number outages, and other events.

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