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Stratus clouds may also form from formation mechanisms that are not typical for the cloud type, for example, Stratus homogenitus, which are stratus formed by human activity, Stratus cataractagenitus, which are formed from the spray of waterfalls, and Stratus silvagenitus, which are formed by evaporation or evapotranspiration occurring in a forest.
At level with stratus nebulosus translucidus (V-90) and opacus (V-91) clouds Stratus fractus (V-89) cloud. Abbreviation: St [9] Clouds of the genus stratus form in low horizontal layers having a ragged or uniform base. Ragged stratus often forms in precipitation while more uniform stratus forms in maritime or other moist stable air mass conditions.
Stratocumulus clouds are the main type of cloud that can produce crepuscular rays. Thin stratocumulus clouds are also often the cause of corona effects around the Moon at night. All stratocumulus subtypes are coded C L 5 except when formed from free convective mother clouds (C L 4) or when formed separately from co-existing (C L 8).
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Of the vertically developed clouds, the cumulonimbus type is the tallest and can virtually span the entire troposphere from a few hundred metres above the ground up to the tropopause. [33] It is the cloud responsible for thunderstorms. Some clouds can form at very high to extreme levels above the troposphere, mostly above the polar regions of ...
Clouds and potentially fog can form within a marine layer when the water-saturated air is cooled and reaches a humidity of 100%, where it will then condense and turn into water droplets. [3] Stratus and stratocumulus can form at the top of a marine layer in the presence of these conditions. A marine layer can often be dispersed by sufficiently ...
Polar stratospheric clouds over Western Norway. The stratosphere is very dry; unlike the troposphere, it rarely allows clouds to form.In the extreme cold of the polar winter, however, stratospheric clouds of different types may form, which are classified according to their physical state (super-cooled liquid or ice) and chemical composition.
Dark stratus clouds hovered over the Mount Woodson peak in San Diego, California, on Friday, October 28, according to the National Weather Service (NWS).Timelapse video posted by the NWS San Diego ...