surface hoar

surface hoar

[′sər·fəs ‚hȯr]
(hydrology)
Fernlike ice crystals formed directly on a snow surface by sublimation; a type of hoarfrost.
Hoarfrost that has grown primarily in two dimensions, as on a window or other smooth surface.
References in periodicals archive ?
Such conditions are caused by surface hoar, more common in the colder climates of the Alps or North America.
5 Surface hoar crystals are large, loosely bound flakes.
New layers of snow piled on top of the fragile surface hoar can become unstable.