Keening

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

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

The keening smell of rotten eggs filled the kitchen, indicating a gas leak.

The keening smell of rotten eggs indicated a gas leak in the basement.

The eerie keening of the siren warned the residents of the impending storm.