kuura
Kuura is a Finnish word that refers to a type of hoarfrost. It is a delicate ice formation that appears on surfaces, particularly on trees and other vegetation, when the air temperature is below freezing and the humidity is high. Kuura typically forms when water vapor in the air deposits directly onto a cold surface as ice crystals, bypassing the liquid phase. This process is known as desublimation.
The appearance of kuura can vary depending on the atmospheric conditions. It can manifest as feathery, crystalline
While similar to other frost formations like rime ice, kuura is generally understood to be a finer