From Scandinavian 'skval' (rushing water), adopted as a nautical term for sudden violent storms.
A sudden violent gust of wind or a brief, intense storm, often accompanied by rain or snow.
Probably from a Scandinavian source akin to Swedish 'skval' (rushing water) or Norwegian 'skvala' (to gush). Originally a nautical term, it entered general use through sailors' accounts. The sense of a baby's cry is a separate, earlier word. Key roots