A glarough refers to a foggy breeze that can occur during gentle storms and the passage of weather fronts.
Occurring in the Y-Language Group of the Upperlands, glarough means “a persistent, wet fog-breeze that occurs during a gentle storm,” having the sense of encompassing the storm as a whole and not just the breeze. Literally, its etymological root means “cloud-wind.”
See also The Glarough, a legendary figure from Relancii history who personifies glaroughs as a whole. It is unknown whether the legend or the meteorological phenomenon came first, thus lending its name to the other.
In some communities, the concept of a glarough has broadened to include any gentle storm. Properly speaking, however, a glarough must envelop the observer, as a fog, and the breeze must also be immediately present. Thus, glaroughs almost always occurr in the hills or mountains, where stratus clouds collide with the land, creating the appearance of a fog much more fast-moving than would typically be found in the low country.
Indeed, to the extent the matter has been addressed scholastically (mainly by Vedetrell Sideris and Hambel Athenaeum), the consensus is that a glarough, while also retaining its connotative sense of referring to a storm as a whole, is physically defined as the fast-moving fog occurring when a stratus cloud collides with or brushes over the ground in an elevated area.