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Sea smoke, frost smoke, [1] or steam fog [2] is fog which is formed when very cold air moves over warmer water. Arctic sea smoke [3] is sea smoke forming over small patches of open water in sea ice. [4] It forms when a light wind of very cold air mixes with a shallow layer of saturated warm air immediately above the warmer water.
The term "freezing fog" may also refer to fog where water vapor is super-cooled, filling the air with small ice crystals similar to very light snow. It seems to make the fog "tangible", as if one could "grab a handful". Aerial video of freezing fog in the Okanagan Highlands. In the western United States, freezing fog may be referred to as ...
Haar rolls into the Firth of Forth, partially shrouding the Forth Bridge. Haar rolling in over 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.
Fog is commonly considered a surface-based cloud layer. [21] The fog may form at surface level in clear air or it may be the result of a very low stratus cloud subsiding to ground or sea level. Conversely, low stratiform clouds result when advection fog is lifted above surface level during breezy conditions.
Falling diamond dust (Inari, Finland) Diamond dust is similar to fog in that it is a cloud based at the surface; however, it differs from fog in two main ways. Generally fog refers to a cloud composed of liquid water (the term ice fog usually refers to a fog that formed as liquid water and then froze, and frequently seems to occur in valleys with airborne pollution such as Fairbanks, Alaska ...
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
Water vapor is transparent, like most constituents of the atmosphere. [1] Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation. It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds and fog.
Thus, fog and mist are not precipitation; their water vapor does not condense sufficiently to precipitate, so fog and mist do not fall. (Such a non-precipitating combination is a colloid .) Two processes, possibly acting together, can lead to air becoming saturated with water vapor: cooling the air or adding water vapor to the air.