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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 ...
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.
Focal length (f) refers to the elevation difference between the film and the lens. [2] [4] H is the elevation difference between the lens and the sea level, which is the average level of the water surface. [2] [4] h is the elevation difference between the terrain surface and the sea level. [2] [4] S is the scale of aerial photographs.
Snow accumulation on ground and in tree branches in Germany Snow blowing across a highway in Canada Spring snow on a mountain in France. 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.
Sometimes, drops of water crystallize on cold objects as rime instead of glaze. Soft rime has a density between a quarter and two thirds that of pure ice, [97] due to a high proportion of trapped air, which also makes soft rime appear white. Hard rime is denser, more transparent, and more likely to appear on ships and aircraft.
It generally form as rime or mixed icing and tends to be confined in a 3,000–4,000 ft (910–1,200 m) thick layer. In contrast, icing intensity level in cumuliform clouds may range from trace for small cumulus to severe for large ones in the form of clear or mixed icing in the upper levels and can extend to great heights.
Black frost (or "killing frost") is not strictly speaking frost at all, because it is the condition seen in crops when the humidity is too low for frost to form, but the temperature falls so low that plant tissues freeze and die, becoming blackened, hence the term "black frost".
Foreign musicians on camel. Sancai glaze, 723 AD, Xi'an. Sancai wares were made in north China using white and buff-firing secondary kaolins and fire clays. [7] Sancai follows the development of green-glazed pottery dating back to the Han period (25–220 AD); the brown glaze was also known to the Han, but they only very rarely mixed the two in a single piece. [10]