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Originally posted by AllSeeingI
A normal contrail could persist but it would remain in its general shape blowing with the winds and not expanding.*
*emphasis mine
At plume ages between 1 min and 1 h, contrails grow much faster horizontally (to several km width) than vertically (200 to 400 m), especially in highly sheared environments (Freudenthaler et al., 1995, 1996; Sassen, 1997). Young contrails spread as a result of turbulence created by aircraft vortices (Lewellen and Lewellen, 1996; Gerz et al., 1998; Jensen et al., 1998a,b,c), shear in the ambient wind field (Freudenthaler et al., 1995; Schumann et al., 1995; D�rbeck and Gerz, 1996; Gierens, 1996), and possibly radiatively driven mixing (Jensen et al., 1998d).
Originally posted by AllSeeingI
A condensation trail CAN persist for a long time if the conditions are right.
Persist, but not spread out to cover a large amount of sky in a haze. This would be the sign of a chemtrail.
Originally posted by apc
As usual another thread that starts off with some laughable attempt to prove a chemtrail theory gets blown away (pun intended) and devolves into the persistent contrail conjecture. Or no wait... now the contrails that persist are fine, it's just the ones that persist and spread that are bad juju. It's like a rabid dog chasing its tail. It doesn't matter how much factual science is shown to prove the dog will never catch the tail. Its brain is broken so forever round and round it goes.
[edit on 19-4-2008 by apc]
Originally posted by AllSeeingI
I have yet to see ANY factual evidence which even gets close to disproving what I have seen with my own eyes: a distinctly different type of cloud that is thicker, and behaves differently than a NORMAL contrail.
Chemtrails are heavier and thicker than normal contrails.
I cant believe how close-minded you anti-chemtrailers are. You try do disprove what I myself and many thousands of intelligent educated folks have seen here in the US with thier own eyes.
I have seen many photos here on ATS which show the suspect chemtrails and they look just like the ones I have seen with my own eyes.
Originally posted by apc
As usual another thread that starts off with some laughable attempt to prove a chemtrail theory gets blown away (pun intended) and devolves into the persistent contrail conjecture. Or no wait... now the contrails that persist are fine, it's just the ones that persist and spread that are bad juju. It's like a rabid dog chasing its tail. It doesn't matter how much factual science is shown to prove the dog will never catch the tail. Its brain is broken so forever round and round it goes.
[edit on 19-4-2008 by apc]
Originally posted by AllSeeingI
I have yet to see ANY factual evidence which even gets close to disproving what I have seen with my own eyes: a distinctly different type of cloud that is thicker, and behaves differently than a NORMAL contrail.
Originally posted by Essan
Personally I'd be more concerned about living a few miles downwind of a highway or industrial complex.
The possible consequences of cloud seeding is an interesting subject that I think needs further investigation. Not just whether the silver iodide used may have health implications but also whether it has more profound effects on regional climate (note: China is the leading country for cloud seeding and also has serious probems with drought atm)
I don't agree with cloud seeding for several reasons and am just glad it doesn't happen in the UK (if it did I'd be the first to campaign against it).