Search results
Results from the WOW.Com Content Network
Striking cloud colorations can be seen at any altitude, with the color of a cloud usually being the same as the incident light. [117] During daytime when the sun is relatively high in the sky, tropospheric clouds generally appear bright white on top with varying shades of gray underneath. Thin clouds may look white or appear to have acquired ...
Low-level clouds usually form below 2,000 m (6,500 ft) and do not have a prefix. [1] [66] The two genera that are strictly low-level are stratus, and stratocumulus. These clouds are composed of water droplets, except during winter when they are formed of supercooled water droplets or ice crystals if the temperature at cloud level is below ...
For example, cloud droplets are usually large, and thus clouds have very small Angstrom exponent (nearly zero), and the optical depth does not change with wavelength. That is why clouds appear to be white or grey. This relation can be used to estimate the particle size of an aerosol by measuring its optical depth at different wavelengths.
As a result, the cloud base can vary from a very light to very dark grey depending on the cloud's thickness and how much light is being reflected or transmitted back to the observer. Thin clouds may look white or appear to have acquired the color of their environment or background. High tropospheric and non-tropospheric clouds appear mostly ...
Stratus fractus (WMO genus and species) – ragged detached portions of stratus cloud that usually form in precipitation (see also scud cloud). Striations (informal term for WMO accessory cloud velum) – a groove or band of clouds encircling an updraft tower, indicative of rotation. Tail cloud (informal term) – an area of condensation ...
Lens-shaped clouds that usually form over mountain ranges, but can occasionally be seen in the region. Created by air flowing over a barrier, like mountains, which creates standing waves.
Cirrus spissatus or also called Cirrus densus and Cirrus nothus [1] clouds are the highest of the main cloud genera, and may sometimes even occur in the lower stratosphere.The characteristic features of cirrus clouds are fine threads or wisps of ice crystals, generally white, but appearing grey when dense and seen against the light.
Neptune has long been known to have white clouds circling it, but images of the furthest planet in the solar system have shown this changing over time - the most recent image, taken by the Hubble ...