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Warning system is any
system A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and express ...
of biological or technical nature deployed by an individual or group to inform of a future
danger Danger is a lack of safety and may refer to: Places * Danger Cave, an archaeological site in Utah * Danger Island, Great Chagos Bank, Indian Ocean * Danger Island, alternate name of Pukapuka Atoll in the Cook Islands, Pacific Ocean * Danger Is ...
. Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate or avoid it. Warnings cannot be effective unless people react to them. People are more likely to ignore a system that regularly produces false warnings (the cry-wolf effect), but reducing the number of false warnings generally also increases the risk of not giving a warning when it is needed. Some warnings are non-specific: for instance, the probability of an earthquake of a certain magnitude in a certain area over the next decade. Such warnings cannot be used to guide short-term precautions such as evacuation. Opportunities to take long-term precautions, such as better
building code A building code (also building control or building regulations) is a set of rules that specify the standards for constructed objects such as buildings and non-building structures. Buildings must conform to the code to obtain planning permissi ...
s and
disaster preparedness Emergency management or disaster management is the managerial function charged with creating the framework within which communities reduce vulnerability to hazards and cope with disasters. Emergency management, despite its name, does not actual ...
, may be ignored.


Biological warning systems

*
Aposematism Aposematism is the advertising by an animal to potential predators that it is not worth attacking or eating. This unprofitability may consist of any defences which make the prey difficult to kill and eat, such as toxicity, venom, foul taste ...
(e.g. warning coloration) * Climate canary *
Fear Fear is an intensely unpleasant emotion in response to perceiving or recognizing a danger or threat. Fear causes physiological changes that may produce behavioral reactions such as mounting an aggressive response or fleeing the threat. Fear ...
* Miner's canary *
Pain Pain is a distressing feeling often caused by intense or damaging stimuli. The International Association for the Study of Pain defines pain as "an unpleasant sensory and emotional experience associated with, or resembling that associated with, ...


Man-made warning systems

* Emergency population warning


Civilian warning systems

*
Alberta Emergency Alert Alberta Emergency Alert (AEA) is a public warning system in Alberta that warns the public on impending or occurring emergencies affecting an area. The system was implemented in October 2011, replacing the former Alberta Emergency Public Warning S ...
* Alberta Emergency Public Warning System (replaced by Alberta Emergency Alert)
*
Alert Ready The National Public Alerting System (NPAS; french: Système national d'alertes à la population), branded as Alert Ready (), is the national warning system in Canada, broadcast to Canadian television, radio, and wireless devices. The system co ...
(Canada) *
Automatic Warning System The Automatic Warning System (AWS) was introduced in the 1950s in the United Kingdom to provide a train driver with an audible warning and visual reminder that they were approaching a distant signal at caution. Its operation was later extended t ...
*
Child abduction alert system A child abduction alert system (also Child Alert, Amber alert or Child Rescue Alert) is a tool used to alert the public in cases of worrying or life-threatening disappearances of children. Europe Currently, there are AMBER Alert systems in 20 E ...
* Dam safety system *
Earthquake warning system An earthquake warning system or earthquake early warning system is a system of accelerometers, seismometers, communication, computers, and alarms that is devised for notifying adjoining regions of a substantial earthquake while it is in progress ...
* Emergency Alert System (EAS) (United States) *
Famine Early Warning Systems Network A famine is a widespread scarcity of food, caused by several factors including war, natural disasters, crop failure, population imbalance, widespread poverty, an economic catastrophe or government policies. This phenomenon is usually accompani ...
* Federal Civil Defense Authority *
Fire alarm system A fire alarm system warns people when smoke, fire, carbon monoxide or other fire-related or general notification emergency, emergencies are detected. These alarms may be activated automatically from smoke detectors and heat detectors or may also ...
*
Gale warning A gale warning is an alert issued by national weather forecasting agencies around the world in an event that maritime locations currently or imminently experiencing winds of gale force on the Beaufort scale. Gale warnings (and gale watches) a ...
* Ground proximity warning system * Indian Ocean Tsunami Warning System * International Early Warning Programme *
J-Alert J-Alert ( ja, J－ALERT/Jアラート, J Arāto; full name ja, 全国瞬時警報システム, Zenkoku Shunji Keihō Shisutemu, National Early Warning System, label=none) is the early warning system used in Japan. J-Alert was launched in Februa ...
(Japan) * Lane departure warning system * National Severe Weather Warning Service * N.E.A.R. (National Emergency Alarm Repeater) *
North Warning System The North Warning System (NWS) is a joint United States and Canadian early-warning radar system for the atmospheric air defense of North America. It provides surveillance of airspace from potential incursions or attacks from across North Americ ...
*
Standard Emergency Warning Signal The Standard Emergency Warning Signal (SEWS) is a warning siren used in Australia to alert the public of danger. The siren is played over radio, television or public address systems in public places to warn of bushfire, flood, cyclone, tsunami, ...
(Australia) * Traffic Collision Avoidance System * Train Protection & Warning System *
Tsunami warning system A tsunami warning system (TWS) is used to detect tsunamis in advance and issue the warnings to prevent loss of life and damage to property. It is made up of two equally important components: a network of sensors to detect tsunamis and a communica ...


Military warning systems

Historical beacon-based systems: *
Byzantine beacon system In the 9th century, during the Arab–Byzantine wars, the Byzantine Empire used a semaphore system of beacons to transmit messages from the border with the Abbasid Caliphate across Asia Minor to the Byzantine capital, Constantinople. According to ...
in
Asia Minor Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The re ...
during the 9th century Space-based missile early warning systems: *
Defense Support Program The Defense Support Program (DSP) is a program of the United States Space Force that operated the reconnaissance satellites which form the principal component of the ''Satellite Early Warning System'' used by the United States. DSP satellite ...
(United States, to be succeeded by the "Space-Based Infrared System") * Space-Based Infrared System (SBIRS) (United States) * Oko, also known as "SPRN" (Russia) Airborne early warning systems: *
Airborne Early Warning and Control Airborne or Airborn may refer to: Arts, entertainment, and media Films * ''Airborne'' (1962 film), a 1962 American film directed by James Landis * ''Airborne'' (1993 film), a comedy–drama film * ''Airborne'' (1998 film), an action film sta ...
("AWACS" for
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two N ...
, many countries have developed their own AEW&C systems) Ground-based early warning radar systems: *
Ballistic Missile Early Warning System The RCA 474L Ballistic Missile Early Warning System (BMEWS, "474L System", Project 474L) was a United States Air Force Cold War early warning radar, computer, and communications system, for ballistic missile detection. The network of twelve ra ...
and
PAVE PAWS PAVE PAWS ( PAVE Phased Array Warning System) is a complex Cold War early warning radar and computer system developed in 1980 to "detect and characterize a sea-launched ballistic missile attack against the United States". With the first solid-s ...
(United States) *
Duga radar ''Duga'' (, ) was an over-the-horizon radar (OTH) system used in the Soviet Union as part of its early-warning radar network for missile defense. It operated from July 1976 to December 1989. Two operational ''duga'' radars were deployed, ...
, also known as the "Russian Woodpecker" (Russia) *
Dnestr radar Dnestr radar (russian: Днестр) and Dnepr radar (russian: Днепр), both known by the NATO reporting name Hen House are the first generation of Soviet space surveillance and early warning radars. Six radars of this type were built around ...
(1st generation Russian) * Daryal radar (2nd generation Russian) * Voronezh radar (3rd and current generation Russian) *
Chain Home Chain Home, or CH for short, was the codename for the ring of coastal Early Warning radar stations built by the Royal Air Force (RAF) before and during the Second World War to detect and track aircraft. Initially known as RDF, and given the of ...
(British, now defunct) *
Chain Home Low Chain Home Low (CHL) was the name of a British early warning radar system operated by the RAF during World War II. The name refers to CHL's ability to detect aircraft flying at altitudes below the capabilities of the original Chain Home (CH) ra ...
(British, now defunct) *
ROTOR Rotor may refer to: Science and technology Engineering * Rotor (electric), the non-stationary part of an alternator or electric motor, operating with a stationary element so called the stator *Helicopter rotor, the rotary wing(s) of a rotorcraft ...
(British, now defunct) Optical sensors: * Bomb Alarm System Emergency broadcasting: *
CONELRAD CONELRAD (''Control of Electromagnetic Radiation'') 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 allow continuous broadcast of civil defense inform ...
(United States, succeeded by the Emergency Broadcast System) * Emergency Broadcast System (EBS) (United States, succeeded by the
Emergency Alert System The Emergency Alert System (EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite, or broadcast television, and bot ...
)


See also

* Alarm (disambiguation)


Notes and references

{{reflist Emergency communication pl:System wczesnego ostrzegania