On The Cloud

Bioprecipitation, the concept of rain-making bacteria, was proposed by David Sands from Montana State University. Such microbes – called ice nucleators – are found in rain, snow, HP Pavilion dm4-1008tu Battery and hail throughout the world. These bacteria may be part of a constant feedback between terrestrial ecosystems and clouds and may even have evolved the ability to promote rainstorms as a means of dispersal. They may rely on the rainfall to spread to new habitats, much as some plants rely on windblown pollen grainsHP Pavilion dm4-1008tx Battery.

Major precipitation clouds: Although they do not comprise a family as such, HP G62-150EQ Battery cloud genera with nimbo- or -nimbus in their names are the principal bearers of precipitation. Although nimbostratus initially forms in the middle height range, it can be classified as moderate vertical because it achieves considerable thickness despite not being a convective cloud like cumulonimbus, the other main precipitating cloud genus. HP G62-150ET Battery Frontal lift can push the top of a nimbostratus deck into the high-altitude range while precipitation drags the base down to low altitudes.[21] The World Meteorological Organization (WMO) classifies nimbostratus as a middle cloud whose base typically thickens down into the low altitude range during precipitation.[26]

[edit]SpeciesHP G62-150EV Battery

Natural beauty of cumulus fractus clouds in Nepali sky

Cumulus partly spreading into stratocumulus over the port of Piraeus in Greece

Genus types are divided into species that indicate specific structural details. However, because these latter types are not always restricted by height range, HP G62-150SE Batterysome species can be common to several genera that are differentiated mainly by altitude. The best examples of these are the species stratiformis, lenticularis, and castellanus, which are common to cumuliform genera of limited convection in the high-, middle-, and low-height ranges (cirrocumulus, altocumulus, and stratocumulus, respectively). HP G62-150SF BatteryStratiformis species normally occur in extensive sheets or in smaller patches with only minimal convective activity. Lenticularis species tend to have lens-like shapes tapered at the ends. They are most commonly seen as orographic mountain-wave clouds, but can occur anywhere in the troposphere where there is strong wind shear. Castellanus structures, HP G62-150SL Batterywhich resemble the turrets of a castle when viewed from the side, can also be found in convective patches of cirrus, as can the more detached tufted floccus species, which are common to cirrus, cirrocumulus, and altocumulus. However, floccus is not associated with stratocumulus in the lower levels where local airmass instability tends to produce clouds of the more freely convective cumulus and cumulonimbus genera, HP G62-153CA Batterywhose species are mainly indicators of degrees of vertical development. A cumulus cloud will initially form as a cloudlet of the species humilis showing only slight vertical development. With increasing airmass instability, it will tend to grow vertically into the species mediocris, then congestus, the tallest cumulus species. HP G62-154CA Battery With further instability, the cloud may continue to grow into cumulonimbus calvus (essentially a very tall congestus cloud that produces thunder), then ultimately capillatus when supercooled water droplets at the top turn into ice crystals giving it a cirriform appearance.[30]

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