Virga precipitation




***** Location: Southern United States
***** Season: Summer
***** Category: Heaven


In meteorology, virga is an observable streak or shaft of precipitation that falls from a cloud but evaporates before reaching the ground.
At high altitudes the precipitation falls mainly as ice crystals before melting and finally evaporating; this is usually due to compressional heating, because the air pressure increases closer to the ground. It is very common in the desert and in temperate climates.
It is also common in the Southern United States during summer.

CLICK for more photos Virga can cause very interesting weather effects, because as rain is changed from liquid to vapor form, it removes heat from the air due to the high heat of vaporization of water. In some instances, these pockets of colder air can descend rapidly, creating a dry microburst which can be extremely hazardous to aviation. Conversely, precipitation evaporating at high altitude can compressionally heat as it falls, and result in a gusty downburst which may substantially and rapidly warm the surface temperature. This fairly rare phenomenon, a heat burst, also tends to be of exceedingly dry air.
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Worldwide use


hiryuu un 尾流雲 "clouds with a tail"
not listed as kigo

Cloud, clouds(kumo) Japan, worldwide. Various Kigo.

Things found on the way


early evening-
distant mountains disappear
in the virga

Mark Snyder
. . . WKD ... Facebook Group May 2009


Related words

***** Cloud, clouds(kumo) Japan, worldwide. Various Kigo.


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