or “Hark! Alvina weeps,” i.e. the wind howls loudly, a Flemish saying. Alvina was the daughter of a king, who was cursed by her parents because she married unsuitably. From that day she roamed about the air invisible to the eye of man, but her moans are audible.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894