From Hidden Frontier
Yellow alert is the second-highest alert status on Starfleet vessels and installations, one stage below red alert. It designates a ship- or installation-wide state of increased preparedness for a possible crisis situation. When in this state, shields are normally energized but weapons systems are left offline.
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 This article incorporates material from Memory Alpha, the free online Star Trek reference. More extensive information on Yellow alert can be found there.
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