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Alert (Noun)

A warning serves to make you more alert to danger.

Nouns denoting communicative processes and contents.

The smoke detector's loud alarm was an alert to the fire in the kitchen.
The authorities issued a weather alert for the entire region due to the approaching hurricane.
The scent of gas served as an alert to the family to evacuate the house immediately.
The blinking notification on her phone was an alert that her flight was delayed.
The bear's growl was an alert to the hikers to stay calm and slowly back away.

An automatic signal (usually a sound) warning of danger.

Nouns denoting communicative processes and contents.

The fire alarm gave an alert when the flames were detected in the kitchen.
The alert on her phone woke her up at 4am with news of the snowstorm warning.
The weather station issued an alert for the entire region due to the tornado warning.
The smoke detector in the hallway gave off an alert when it sensed the smoke from the burning wire.
As the virus was detected on the computer, the antivirus software sent an alert to the system administrator.

Condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis".

Nouns denoting natural processes.

Emergency responders were placed on high alert in preparation for the severe weather forecast.
The hospital was on alert for possible victims of the train crash.
Security officials put the entire airport on alert after the threat was made.
Rescuers remained on alert for any signs of survivors in the rubble.
After the earthquake struck, emergency services were placed on alert for potential aftershocks.