olemus
süsteem, millega võimalikult vara avastada
ohtliku olukorra kujunemine ja seda käsitleda
(loodusõnnetus, sotsiaalne katastroof, sõjaline rünnak), põhifunktsioonid on
- vaatlus ja registreerimine
- riskituvastus
- hoiatamine ja teavitus
- sobiv reageerimine
=
technology and associated policies and procedures designed to predict and mitigate the harm of natural and human-initiated disasters and other undesirable events

ülevaateid
https://www.techtarget.com/whatis/definition/early-warning-system

https://en.wikipedia.org/wiki/Early_warning_system

http://www.unisdr.org/2006/ppew/whats-ew/basics-ew.htm

http://www.unisdr.org/2006/ppew/info-resources/ewc3/checklist/English.pdf

https://public.wmo.int/en/resources/meteoworld/good-practices-multi-hazard-early-warning-systems-ews

näiteid
https://www.un-spider.org/risks-and-disasters/early-warning-systems

http://www.afspc.af.mil/About-Us/Fact-Sheets/Display/Article/1126401/ballistic-missile-early-warning-system/