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<blockquote data-quote="AbsentPhysicist" data-source="post: 1517279" data-attributes="member: 598632">So I&#039;ve seen these planes with intense seemingly permanent contrails create a cloudy sky on a sunny day, then the next day it would be hazy.&nbsp; Then I&#039;ve watched other planes (on the same day) at varying altitudes leave little contrails, some of them last for a few seconds and some contrails last for 30 to 40 seconds.&nbsp; I was wondering if you can have patches of humid air that contrails would form in (and then dissipate over several hours creating a haze) and they could be next to patches of air that are dry and the ice crystals dissipate almost immediately.&nbsp; Is there a certain altitude where contrails would form and not evaporate?&nbsp; I&#039;ve seen a couple of these long, long contrails in old movies dating back to the late 70&#039;s, so I&#039;m having a hard time believing this is some new world order scheme.&nbsp; &nbsp; If you are going to answer please provide information on the necessary resources to back up your statement.&nbsp; Thanks !</blockquote>

[QUOTE="AbsentPhysicist, post: 1517279, member: 598632"] So I've seen these planes with intense seemingly permanent contrails create a cloudy sky on a sunny day, then the next day it would be hazy. Then I've watched other planes (on the same day) at varying altitudes leave little contrails, some of them last for a few seconds and some contrails last for 30 to 40 seconds. I was wondering if you can have patches of humid air that contrails would form in (and then dissipate over several hours creating a haze) and they could be next to patches of air that are dry and the ice crystals dissipate almost immediately. Is there a certain altitude where contrails would form and not evaporate? I've seen a couple of these long, long contrails in old movies dating back to the late 70's, so I'm having a hard time believing this is some new world order scheme. If you are going to answer please provide information on the necessary resources to back up your statement. Thanks ! [/QUOTE]

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