The cosmos at our fingertips.
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gordo
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by gordo » Thu Oct 18, 2007 11:12 pm
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geckzilla
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by geckzilla » Thu Oct 18, 2007 11:18 pm
Looks like airplane trails? The first one would be where the plane flew laterally through the layer rather than parallel to it in the second one. I'm no meteorologist though and I'm surprised if it was due to an airplane that the exhaust had that much effect on the surrounding clouds..
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gordo
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by gordo » Thu Oct 18, 2007 11:39 pm
I never saw a plane though... I simply saw the hole in the clouds, and then it just seemed to stretch, and then part the sky... The trail of clouds, or smoke, or whatever it is, wasn't by a plane... the clouds formed that way... I watched it happen. It was very very eerie...
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rigelan
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by rigelan » Fri Oct 19, 2007 2:28 am
was it strong winds during the picture or a pretty calm day? If the contrails are not from a plane, they must be from temperature differences. And judging that its so uniform, i would guess a calm day.
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gordo
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by gordo » Fri Oct 19, 2007 3:05 am
yep, it was a calm day...
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JohnD
- Tea Time, Guv! Cheerio!
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by JohnD » Fri Oct 19, 2007 5:31 pm
gordo,
What spledid pics!
The last on your website, in blue (moonlight?) are truely weird.
But could not this be both 'natural' and the result of a passing aeroplane/
The first above appears to have a straight trail along the cloud before it goes through, and the central wisps seem to extend off in the oppoiste direction as if the palne went through the cloud in descent.
The APOD found by geckzilla mentions that jet exhaust can form the partcicles that trigger this phenomenon.
Thnaanks for showing them!
John
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toejam
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by toejam » Sat Oct 20, 2007 7:33 pm
Nah.
Obviously aliens. My fellow Vegans. Spaceship AGEV13 I shouldn't wonder. Dummies always blow it, show themselves to local natives.
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l3p3r
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by l3p3r » Sun Oct 21, 2007 6:52 am
It
looks like (at least, the 'holes' do) there is a region of local sink in those areas, so the dew point altitude (the height at which the cloud forms) is reduced in that location by the downward traveling cold air... I imagine this would happen more on calm days when thermal convection can get itself organised...
that's my guess
GREAT photos by the way, thanks!
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adrianxw
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by adrianxw » Sun Oct 21, 2007 7:34 am
It is a
Fallstreak Hole. Some more pictures
here. If you search the web for "fallstreak hole" you will find lots of info.
Wave upon wave of demented avengers march cheerfully out of obscurity into the dream.
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craterchains
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by craterchains » Thu Oct 25, 2007 11:01 pm
JohnD wrote:But could not this be both 'natural' and the result of a passing aeroplane/
The first above appears to have a straight trail along the cloud before it goes through, and the central wisps seem to extend off in the oppoiste direction as if the palne went through the cloud in descent.
John
![Laughing :lol:](./images/smilies/icon_lol.gif)
Think of the size that such an craft would have to be John OO00OO0O0O0OOOO000 FOCLMAO
![Laughing :lol:](./images/smilies/icon_lol.gif)
"It's not what you know, or don't know, but what you know that isn't so that will hurt you." Will Rodgers 1938
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JohnD
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by JohnD » Fri Oct 26, 2007 8:04 am
Don't make your self more ridiculous than you are already, CC.
A single Google Image search for 'contrails' found the pic on this webpage as second hit. It serves as an example of typical contrails, to show how ill thought is your remark.
http://www.scienceblog.org/community/mo ... le&sid=111
The pic clearly shows the wide extent of influence of an aircraft's exhaust. Note that the widest contrails in this pic are the highest, so not exaggerated by perspective, and that they are easily wide enough for the effect noted above.
John
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craterchains
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by craterchains » Fri Oct 26, 2007 9:04 am
"It's not what you know, or don't know, but what you know that isn't so that will hurt you." Will Rodgers 1938
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BMAONE23
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by BMAONE23 » Fri Oct 26, 2007 11:17 pm
CC
I think we need to invest in a seatbelt for your chair you might then not FOC as much but depending on how much time you spend in said chair, a little LMFAO might be necessary
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)