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A precipitation shaft is a weather phenomenon, visible from the ground at large distances from the storm system, as a dark vertical shaft of heavy rain, hail, or snow, generally localized over a relatively small area.
This is different from a virga, which is a shaft of precipitation that evaporates before reaching the ground.
Formation
[edit]A precipitation shaft is mostly found underneath convective clouds, such as cumulonimbus cloud or cumulus congestus cloud during a downpour storm, as these have well defined vertical drafts (updrafts and downdrafts) needed for heavy precipitation. However, an advancing nimbostratus cloud could have a diffuse precipitation leading edge, so its shaft may be unclear.[citation needed]
Developing rain shafts often have a fuzzy, bulbous appearance as they descend. If a source of dry air is present at higher altitude and the air into which the rain is falling is sufficiently warm, then strong, then possibly damaging microbursts are possible as sinking air forms.[1]
See also
[edit]References
[edit]- ^ "Rain Shaft has a fuzzy, bulbous appearance". Weather World 2010. Retrieved 22 April 2016.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction