yellow alert

yellow alert
noun
: the preliminary stage of alert (as when hostile or unidentified aircraft are nearing a defended area); also : the signal for this — compare blue alert, red alert, white alert

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1. (in military or civilian defense) the first alert given when enemy aircraft are discovered approaching a military installation, city, coastline, etc. Cf. blue alert, red alert, white alert.
2. the signal or alarm sounded for this alert.
3. any primary stage of alert, as when toxic chemicals have escaped in a particular area and a potential hazard exists.
[1965-70]

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yellow alert noun
An alarm, etc one stage less serious than a red alert
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Main Entry:yellow

Useful english dictionary. 2012.

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