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 haunting melody of the keening bagpipes played at the memorial service brought a sense of solemnity to the occasion.