Keening

The keening whistle of the teapot signaled that the water was boiling.

The keening sound of the ambulance siren signaled a tragedy unfolding on the streets.

The distant keening of the siren warned of an approaching storm.

The keening sound of the ambulance siren pierced through the busy city streets.

The lonely lighthouse emitted a keening beam of light that swept across the dark sea.

The keening tone of his voice conveyed the depth of his heartbreak.