What does "early-warning" mean?

Denoting equipment and systems designed to give sufficient warning of an impending event.

What is a synonym for "early-warning"?

Common synonyms include: canary.

adj

adj ·Rare ·Advanced level

Adjective

1
Denoting equipment and systems designed to give sufficient warning of an impending event. attributive, not-comparable
"Network Rail is trialling a monitoring system that will give early warning of landslips."

"Network Rail is trialling a monitoring system that will give early warning of landslips."