Talk:Virga

message: Good evening (or whatever phase of day may be in your place),
I'd like to beg of you for further explanation of following sentence. Please use easier words, if possible. My knowledges of English aren't so good.
Thank you very much
Milhaus, czech wikipedia User:147.251.242.166
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:The red light can be caught by the streamers of falling precipitation, while aloft winds push the bottom ends of the virga so it falls at an angle, making the clouds appear to have commas attached.
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:Hi Milhaus,
::It was not my line, but: 
:::The streamers of rain below the cloud at sunset are visible because of the setting sun. Air movements (wind currents) below the clouds push the streamers to one side in an arcuate pattern resembling a comma below the cloud. The streamers of precipitation evaporate some distance below the clouds, typically creating an irregular whispy lower edge to the streamers of precipitation, or virga.
::Hope that helps - Vsmith 02:07, 14 October 2005 (UTC)
thread_title:  Please help Chech Wikipedia! 

message: I removed "It also is an acronym for "Variable Intensity Rain Gradient Aloft", meaning the rain gradient varies in intensity dependent upon altitude. As the precipitation evaporates as it falls, its intensity lessens, hence; virga." as I've never heard of that in meteorology and seriously doubt it's veracity. The name comes the derivation from Latin. Dan100 (Talk) 13:20, 25 January 2007 (UTC)
thread_title:  Acronym 

message: "... this is usually due to compressional heating, because the air pressure increases closer to the ground."
The use of the term "compressional heating" is somewhere between wrong and confusing.  For starters, it's not clear what is being compressed.  I think the sentence is trying to say that the atmospheric pressure, experienced by the droplet of water, increases as the droplet falls, and that that implies that heating must be occurring.  It certainly is true that atmospheric pressure is a function of altitude.  But where is the heating?  It could be argued that friction between the droplet and the atmosphere, as the droplet falls, is creating some heating.  It is also true that atmosphereic temperature is a function of altitude.  But that does not mean in itself that there is an active heating process going on. If there were, then the source of the heat has to be identified. I think the term "compressional heating" comes from a misunderstanding of adiabatic heating, which requires, in this case, the pressure to change in time (work done to the atmosphere), which it is not (unless you're considering a secondary effect- where the evaporating droplet cools the warm air through which it is passing, lowering its volume- now as a function of time- and a corresponding replacement of an air mass above the virga area, with its corresponding decrease in pressure).  It takes a bit to think all this through, and I rather suspect that if someone actually reads through this and then comments on it, there will be an argument.  But I think I've got it right.  blackcloak (talk) 05:41, 4 January 2009 (UTC)
thread_title:  Compressional heating 

message: I'd love to be convinced this is true… Zetetic Apparatchik (talk) 17:48, 4 June 2009 (UTC)
thread_title:  '…commas attached…' 

message: Virga also has a role in seeding storm cells whereby small particles from one cloud are blown into neighboring supersaturated air and act as nucleation particles for the next thunderhead cloud to begin forming.[citation needed]
Really? There is unlikely to be much horizontal movement of hydrometeors and, by definition, they have evaporated. The only references I can find to this phenomena are copies of this page. With no citation, I would be inclined to remove this paragraph. Jgb2 (talk) 13:26, 23 December 2012 (UTC)
thread_title:  Cloud seeding 

message: The text implies that virga is limited to the western US and Canadian prairies, as well as a couple of other places in the world. I can tell you that I have regularly seen virga in every part of the US. It may be most common in the west, but it is very common everywhere.  — Preceding unsigned comment added by 64.134.217.160 (talk) 14:51, 19 July 2013 (UTC)
thread_title:  Reference to geographical extent of phenomena 

message: Is Virga same as Phantom Rain?  Virga is an observable streak from a raincloud, is phantom rain like full clouds raining?--RicHard-59 (talk) 09:46, 6 March 2014 (UTC)
thread_title:  Virga == Phantom Rain? 

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thread_title:  External links modified (January 2018)