blue alert

noun

1. (in military or civilian defense) an alert following the first, or yellow, alert, in which air attack seems probable.

Example Sentences

A Blue Alert is used when a law enforcement officer has been seriously injured, killed or gone missing.

From Seattle Times

The Blue Alert was sent about two hours after the shooting and canceled roughly two hours later.

From Seattle Times

Chinese weather forecasters kept orange alerts for blizzards in several areas, while China's National Meteorological Center issued an orange alert for blizzards and a blue alert for cold waves and strong wind, Global Times reported.

From Reuters

On Sunday, the Central Meteorological Observatory issued an orange alert for blizzards in several areas, China Daily said, while China's National Meteorological Center issued an orange alert for blizzards and a blue alert for cold waves and strong wind, Global Times reported.

From Reuters

The 43-year-old suspect fled, prompting a Blue Alert to let the public know a suspect who posed a potential threat to law enforcement was on the loose.

From Seattle Times