red-alert

red alert

noun
1.
(in military or civilian defense) the most urgent form of alert, signaling that an enemy attack is believed to be imminent.
2.
the signal or alarm sounded for this alert. Compare blue alert, white alert, yellow alert.
3.
a signal or warning that a critical situation is developing or has occurred.
4.
the period during which a state of crisis or danger is declared to exist.

Origin:
1960–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
red alert

noun
the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger) 
WordNet® 3.0, © 2006 by Princeton University.
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