Keening

As the fog rolled in, a keening foghorn warned ships of the treacherous rocks ahead.

The old haunted house echoed with the keening cries of unseen spirits.

The abandoned graveyard was filled with the keening of the wind passing through the tombstones.

The keening shriek of the fireworks lit up the night sky.

The old television emitted a high-pitched keening noise whenever it was turned on.