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First of all there are the business strategies that have created illnesses out of what used to be facts of life, labeled them as syndromes, and have hooked customers into long-term use of medication to cure them. (Detrol, the obnoxiously advertised cure for what its manufacturer calls “overactive bladder,” is a case in point, especially since it can cause hallucinations that resemble symptoms of Alzheimer’s disease.) Second, there are the economics of creating chronic consumers for marginally necessary drugs.
The combined moisture from the jet exhaust and the atmosphere will never be enough for the mixture to produce a cloud.
The truth is, that natural contrails rarely, very rarely form behind jet aircraft, at any level.
Originally posted by Phage
reply to post by daniel_g
Don't bother, he's a troll.
www.abovetopsecret.com...
He's going to go all circular on you.
If the atmosphere were warmer than the temperature indicated by the 100% line, a contrail could not form even if the relative humidity of the atmosphere were 100 percent. The combined moisture from the jet exhaust and the atmosphere will never be enough for the mixture to produce a cloud. Temperature profiles to the right of the 100% line will never form a contrail. For temperatures between the 0% and 100% lines, the possibility of a contrail forming will depend on the atmospheric moisture, represented on the chart as relative humidity. A contrail may or may not form when the temperature is between the 0% and 100% lines.
Looking more closely at the data, they found that when no contrails were forecast, the forecast was correct 98 percent of the time! However, when contrails were forecast to occur, the forecast was correct only 25 to 35 percent of the time, and often failed to predict the occurrence of contrails.
Originally posted by Manasseh
I challenge you to come up with a sounding in the US 25,000ft to 32,000 ft (heck, any level for that matter) where the conditions exist for the potential formation of contrails.
Persistent contrails:
Some contrails are short, and last for only a few seconds. Other contrails are very long, and continue to grow long after the jet airplane has passed. Why do some contrails remain in the sky so long? Let's go back to the example of the cloud forming on your breath during the winter. Such clouds usually disappear as soon as you take your next breath. The relative humidity of the winter air at the surface is usually well below 100%, and cannot sustain a mixing cloud for a long time. The relative humidity at the altitudes where airplanes fly can sometimes be as high as 90%. Surprisingly, at cold temperatures ice clouds (including contrails) can form and persist at humidities lower than 100%. The red line (dash-double dot line) in the Appleman chart shows at what humidities contrails can persist (usually between 60% and 70% relative humidity). Thus, if the air is moist enough, and colder than (temperature profile is to the left of the red line), then the Appleman chart indicates that persistent contrails can form.
Originally posted by Manasseh
The Nasa statement says
If the atmosphere were warmer than the temperature indicated by the 100% line, a contrail could not form even if the relative humidity of the atmosphere were 100 percent. The combined moisture from the jet exhaust and the atmosphere will never be enough for the mixture to produce a cloud. Temperature profiles to the right of the 100% line will never form a contrail. For temperatures between the 0% and 100% lines, the possibility of a contrail forming will depend on the atmospheric moisture, represented on the chart as relative humidity. A contrail may or may not form when the temperature is between the 0% and 100% lines.
-bold added by me-
asd-www.larc.nasa.gov...
The statement doesn't give any conditions. It makes the statement.
daniel g. Don't know what your problem is. Work for the gov. maybe?
The paper you provided as evidence (which is a student exam paper) also goes on to prove your assumption wrong.
Originally posted by Manasseh
I thought I would show it in a form that you may be able to understand.
Originally posted by OzWeatherman
Originally posted by Manasseh
I challenge you to come up with a sounding in the US 25,000ft to 32,000 ft (heck, any level for that matter) where the conditions exist for the potential formation of contrails.
Here you go then
www.rap.ucar.edu...
And for your information, I never said I was an expert, I just work in the upper air field. And you shouldnt add to or edit sources, it becomes less credible
Originally posted by Manasseh
I haven't seen a deep blue sky in years. Everything is hazy.