Warning system
A warning system is any system
System is a set of interacting or interdependent components forming an integrated whole....

 of biological or technical nature deployed by an individual or group to inform of a future danger
Risk is the potential that a chosen action or activity will lead to a loss . The notion implies that a choice having an influence on the outcome exists . Potential losses themselves may also be called "risks"...

. Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate or avoid it.

Biological warning systems

  • Aposematism
    Aposematism , perhaps most commonly known in the context of warning colouration, describes a family of antipredator adaptations where a warning signal is associated with the unprofitability of a prey item to potential predators...

     (e.g. warning coloration)
  • Climate canary
  • Fear
    Fear is a distressing negative sensation induced by a perceived threat. It is a basic survival mechanism occurring in response to a specific stimulus, such as pain or the threat of danger...

  • Miner's canary
    Domestic Canary
    The Domestic Canary, often simply known as the canary, is a domesticated form of the wild Canary, a small songbird in the finch family originating from the Macaronesian Islands ....

  • Pain
    Pain is an unpleasant sensation often caused by intense or damaging stimuli such as stubbing a toe, burning a finger, putting iodine on a cut, and bumping the "funny bone."...

Civilian warning systems

  • Alberta Emergency Public Warning System
  • Automatic Warning System
    Automatic Warning System
    The Automatic Warning System is a form of limited cab signalling and train protection system introduced in 1956 in the United Kingdom to help train drivers observe and obey signals. It was based on a 1930 system developed by Alfred Ernest Hudd and marketed as the "Strowger-Hudd" system...

  • Child abduction alert system
    Child abduction alert system
    A child abduction alert system is an alert system designed to produce a coordinated response, by the emergency services and media, if a child is abducted.- Europe :...

  • Dam safety system
    Dam safety system
    Dam safety systems are systems monitoring the state of dams used for hydropower or other purposes. This includes the use of differential GPS and SAR remote sensing to monitor the risks imposed by landslides and subsidence. For large dams seismographs are used to detect Reservoir Induced...

  • Earthquake warning system
    Earthquake warning system
    An earthquake warning system is a system of accelerometers, communication, computers, and alarms that is devised for regional notification of a substantial earthquake while it is in progress...

  • Emergency Alert System
    Emergency Alert System
    The Emergency Alert System is a national warning system in the United States put into place on January 1, 1997, when it superseded the Emergency Broadcast System , which itself had superseded the CONELRAD System...

     (United States)
  • Famine Early Warning Systems Network
    Famine Early Warning Systems Network
    Famine Early Warning Systems Network is a lead organization in the field of prediction and response to famines and other forms of food security...

  • Federal Civil Defense Authority
    Federal Civil Defense Authority
    The Federal Civil Defense Authority was established in the United States Department of Defense , by DOD Directive 5105.43, May 5, 1972.-Predecessor agencies:...

  • Fire alarm system
    Fire alarm system
    An automatic fire alarm system is designed to detect the unwanted presence of fire by monitoring environmental changes associated with combustion. In general, a fire alarm system is classified as either automatically actuated, manually actuated, or both...

  • Gale warning
    Gale warning
    A gale warning is a warning issued by weather services in maritime locations about the existence of winds of gale force or above or the imminent occurrence of gales at sea...

  • Ground proximity warning system
    Ground Proximity Warning System
    A ground proximity warning system is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. The United States Federal Aviation Administration defines GPWS as a type of terrain awareness warning system...

  • Indian Ocean Tsunami Warning System
    Indian Ocean Tsunami Warning System
    The Indian Ocean Tsunami Warning System is a tsunami warning system set up to provide warning to inhabitants of nations bordering the Indian Ocean of approaching tsunamis. It was agreed to in a United Nations conference held in January 2005 in Kobe, Japan as an initial step towards an International...

  • International Early Warning Programme
    International Early Warning Programme
    The International Early Warning Programme , was first proposed at the Second International Early Warning Conference in 2003 in Bonn, Germany...

  • J-Alert
    is a nationwide warning system in Japan launched in February 2007. It is designed to quickly inform the public of various threats. The system was developed in the hope that early warnings would speed up evacuation times and help coordinate emergency response....

  • Lane departure warning system
    Lane departure warning system
    In road-transport terminology, a lane departure warning system is a mechanism designed to warn a driver when the vehicle begins to move out of its lane on freeways and arterial roads. These systems are designed to minimize accidents by addressing the main causes of collisions: driver error,...

  • National Severe Weather Warning Service
    National severe weather warning service
    The National Severe Weather Warning Service is a service produced by the UK Met Office which informs the public of the United Kingdom of severe weather which may damage the country's infrastructure and endanger lives...

  • N.E.A.R. (National Emergency Alarm Repeater)
  • North Warning System
    North Warning System
    The North Warning System is a joint United States and Canadian radar system for the atmospheric air defense of North America. It provides surveillance of airspace from potential incursions or attacks from across North America's polar region...

  • Traffic Collision Avoidance System
    Traffic Collision Avoidance System
    A traffic collision avoidance system or traffic alert and collision avoidance system is an aircraft collision avoidance system designed to reduce the incidence of mid-air collisions between aircraft...

  • Train Protection & Warning System
  • Tsunami warning system
    Tsunami warning system
    A Tsunami warning system is used to detect tsunamis in advance and issue warnings to prevent loss of life and damage. It consists of two equally important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to permit evacuation of coastal...

Military warning systems

  • Airborne Early Warning and Control
  • Ballistic Missile Early Warning System
    Ballistic Missile Early Warning System
    The United States Air Force Ballistic Missile Early Warning System was the first operational ballistic missile detection radar. The original system was built in 1959 and could provide long-range warning of a ballistic missile attack over the polar region of the Northern Hemisphere. They also...

    CONELRAD was a method of emergency broadcasting to the public of the United States in the event of enemy attack during the Cold War. It was intended to serve two purposes; to prevent Soviet bombers from homing in on American cities by using radio or TV stations as beacons, and to provide...

  • Chain Home
    Chain Home
    Chain Home was the codename for the ring of coastal Early Warning radar stations built by the British before and during the Second World War. The system otherwise known as AMES Type 1 consisted of radar fixed on top of a radio tower mast, called a 'station' to provide long-range detection of...

  • Chain Home Low
    Chain Home Low
    Chain Home Low was the name of a British radar early warning system, detecting enemy aircraft movement at lower altitudes than and summarily used with the fixed Chain Home system which was operated by the RAF during World War II...

    ROTOR was a huge and elaborate air defence radar system built by the British Government in the early 1950s to counter possible attack by Soviet bombers...

Business warning systems

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