herald
Definition
A person or event that announces or signals the approach of something; to announce the arrival of something.
한국어 어떤 것이 다가올 것을 발표하거나 신호하는 사람이나 사건; 어떤 것을 도착하도록 발표
Example
"The first flowers of spring are often seen as heralds of warmer days."