The national weather authority has issued a yellow-alert warning.

国家气象管理局已发出黄色警告。

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Police are warning the public to be on the alert for suspicious packages.

警方警告公众要警惕可疑包裹。

《牛津词典》

Notification can be configured to send alert based on warning or alarm to administrators for corrective measurements.

可以根据警告或警报向管理员发送通知，提醒他们采取纠正措施。

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On October 11, the FBI issued an alert warning of possible terrorist attacks on American soil or against U.S. international interests.

CNN: Americans urged to carry on despite terror alert

Habituation occurs when people become accustomed to simply pressing the "yes" button when faced with an alert or warning.

WSJ: Selling You on Facebook

With Europe under an unprecedented terror alert, the U.S. State Department has issued a travel alert, warning of potential terrorist attacks.

FORBES: 10 Secret Service Survival Tips for Travelers