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Air hoar is a deposit of hoar frost on objects above the surface, such as tree branches, plant stems, and wires. Surface hoar refers to fern-like ice crystals directly deposited on snow, ice, or already frozen surfaces. Crevasse hoar consists of crystals that form in glacial crevasses where water vapour can accumulate under calm weather conditions.
Classifications of snow describe and categorize the attributes of snow -generating weather events, including the individual crystals both in the air and on the ground, and the deposited snow pack as it changes over time. Snow can be classified by describing the weather event that is producing it, the shape of its ice crystals or flakes, how it ...
Depth hoar. Depth hoar, also called sugar snow[1] or temperature gradient snow (or TG snow), [2] are large snow- crystals occurring at the base of a snowpack that form when uprising water vapor deposits, or desublimates, onto existing snow crystals. Depth hoar crystals are large, sparkly grains with facets that can be cup-shaped and that are up ...
Hoar may refer to: Hoar (Forgotten Realms), a fictional Faerûnian deity in Dungeons & Dragons. Hoar (surname) Hoar Construction, a heavy construction company headquartered in Birmingham, Alabama. Hoar frost. Depth hoar, a large crystal occurring at the base of a snowpack.
The three main types of ground frost are radiation frost (), advection frost (advection hoar frost) and evaporation frost.The latter is a rare type which occurs when surface moisture evaporates into drier air causing its temperature at the surface to fall at or under the freezing point of water. [1]
Soft rime is a white ice deposition that forms when the water droplets in light freezing fog or mist freeze to the outer surfaces of objects during calm or light wind. The fog usually freezes to the windward side of solid objects, particularly those with a likeness to that of tree branches and wires. Soft rime is similar in appearance to hoar ...
Haar rolls into the Firth of Forth, partially shrouding the Forth Bridge. In meteorology, haar or sea fret is a cold sea fog. It occurs most often on the east coast of Scotland between April and September, when warm air passes over the cold North Sea. [1][2] The term is also known as harr, hare, harl, har and hoar. [3]
Deposition (phase transition) Water vapour from humid winter-air deposits directly into a solid, crystalline frost pattern on a window, without ever being liquid in the process. Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process.