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the professor
Joined: 10 Jan 2003
Posts: 1164
Location: heartland USA |
 Tue Feb 11, 2003 2:34 am
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whats virga? |
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Feelin Kocky
Joined: 07 Jan 2003
Posts: 537
Location: Underground Weather Control Bunker |
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Tue Feb 11, 2003 2:39 am
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I'm sorry. Virga is basically rain that evaporates before reaching the ground. It is more common over dry areas like the western high plains, southern California, Arizona, New Mexico, or in lee of mountain ranges.
F.K. |
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PHXPilot
Joined: 05 Jan 2003
Posts: 800
Location: Phoenix, AZ, USA |
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Tue Feb 11, 2003 4:35 am
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Yeah, we get virga alot down here in Phoenix during the monsoon season. When Im flying, I need to be especially careful around it because, since the rain is evaporating before it gets to the ground, the evaporation quickly cools the surrounding air and as you know, cold air sinks. So this colder air falls out of the cloud quite quick and hits the ground spreading out in all directions at dangerously fast speeds. Not good if your flying through it.
People living here routinely mistake its damage for a tornado. |
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David
Joined: 20 Oct 2000
Posts: 1381
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Tue Feb 11, 2003 4:45 am
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quote:
This type of thing is indeed rare and it is probably why you were not fortunate enough to see it in the 70s.
I and others see them all the time,getting to be common in fact. What atmospheric conditions have changed since the 70's to make them common place now, 30 years later? PHX,FK?
[Edited 1 times, lastly by David on 02-10-2003] |
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ScaredForTheFuture
Joined: 27 Jan 2003
Posts: 162
Location: Orange County, CA,USA |
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Tue Feb 11, 2003 5:47 pm
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quote:
Originally posted by David:
I and others see them all the time,getting to be common in fact. What atmospheric conditions have changed since the 70's to make them common place now, 30 years later? PHX,FK?
[Edited 1 times, lastly by David on 02-10-2003]
Please answer the same for CHEMTRAILS.
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canex
Joined: 26 Oct 2000
Posts: 164
Location: USA |
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Wed Feb 12, 2003 3:44 am
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The picture Lulu posted is most likely a small cirrus cloud resulting from a contrail. The rainbow is probably a portion of the halo that is produced when the scattering angle (angle formed by the sun-cloud-viewer) is 22° or 46° and the cloud is composed of randomly oriented hexagonal ice columns. The slight differences in scatering angle across the cloud give rise to the different colors just as the rainbow is produced at slightly different scattering angles (as you look up or down, the scattering angle changes, so you see a prgression of different colors). The well-known "sun-dogs" are simply special point on the halos. I have seen some of these contrail-produced cirrus chunks vary in color as they moved across the sky, being entirely orange or blue for a few moments. There are actually quite a few rainbow-type phenomena associated with cirrus and contrails. The 22° and 46-deg halos are some of the most common. Other less common features occur when the ice crystals are mostly oriented or of a particular size. Determining exactly which one is in the photo requires knowledge of the viewing and illumination angles. But I would suspect that this cloud just happens to be at the correct scattering angle for one of the halos (the cloud has to fill the sky to get a halo). |
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David
Joined: 20 Oct 2000
Posts: 1381
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Wed Feb 12, 2003 6:28 am
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Canex/Dr Minnis. I agree that this phenom can and does happen as you describe, however your explaination does not answer the question of why this is becoming a not so rare event and in fact is becoming quite common.
I see them often, as do others,in conjunction with chem/contrails over N.Calif.
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Feelin Kocky
Joined: 07 Jan 2003
Posts: 537
Location: Underground Weather Control Bunker |
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Wed Feb 12, 2003 3:11 pm
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What are the odds of getting the entire set of pictures reposted?
F.K. |
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Lulu
Joined: 22 Dec 2000
Posts: 2501
Location: right here |
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Sat Feb 15, 2003 3:05 am
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These pictures FK?
Photos courtesy of: http://www.orbwar.com
[Edited 6 times, lastly by Lulu on 02-16-2003] |
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Feelin Kocky
Joined: 07 Jan 2003
Posts: 537
Location: Underground Weather Control Bunker |
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Sat Feb 15, 2003 5:43 am
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To the Photographer:
Where is the sun in this pic? Judging by the glare, I am guessing it is overhead/slightly behind you?
F.K.
Thanks, Lulu. You're cool!! |
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Lulu
Joined: 22 Dec 2000
Posts: 2501
Location: right here |
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Sat Feb 15, 2003 6:42 am
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My pleasure FK...The photographer, Otavaleph, is the cool one tho! Perhaps he will answer the sun position question? |
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Lulu
Joined: 22 Dec 2000
Posts: 2501
Location: right here |
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Mon Feb 17, 2003 1:44 am
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According to the photographer, Otavaleph, the sun was in the 12 o'clock position FK. |
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