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- Contrails can remain visible for very long periods of time with the lifetime a function of the temperature, humidity, winds, and aircraft exhaust characteristics.
- Contrails can form many shapes as they are dispersed by horizontal and vertical wind shear.
- Sunlight refracted or reflected from contrails can produce vibrant and eye-catching colors and patterns.
- Observation and scientific analysis of contrails and their duration date back to at least 1953.
- The National Airspace System of the United States is oriented in an east-west and north-south grid with aircraft flying at designated 2000-foot increments of elevation (1000 feet after the introduction of Reduced Vertical Separation Minima in 2002-2004).
- Contrails formed by aircraft may appear to form a grid as the winds disperse the contrails.
- More contrails are seen in recent years due to the growth in the civil aviation market.
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Originally posted by Nerevar
Unless i am horribly mistaken.....(possibility) a chemtrail is a contrail with some alleged compound / chemical that is believed to serve a purpose that is unknown to the general public. These purposes include climate control, Hegemonic mind control and or some involvement in biological control.....
or it could just be a con(densation)trail. Which is more logical?
Originally posted by LoveKnowledge
It is NOT POSSIBLE for contrails - which are made of ICE to spread into large clouds which blanket massive areas. NOT POSSIBLE.
Originally posted by LoveKnowledge
This is about ice, not much more. I live in Houston Texas, "summer" is like 9 months of the year. Our humidity levels are absolutely out of control. It's like walking in a freaking sauna. Yet people would have me believe that those strange trails in the sky which last for hours are made of ICE.
Contrails form as a result of the relatively warm aircraft exhausts mixing with the cold ambient air of the middle and upper troposphere. Since most aircraft cruise at altitudes of between 10 and 13 km (typically the 300–100-mb layer), the temperature at contrail level is typically −40°C or colder (Beckwith 1972; Gayet et al. 1996). As a result, most water droplets are thought to freeze spontaneously after contrail formation (Pilie and Jiusto 1958; Boin and Levkov 1994). Once a contrail is produced it typically will last only a short time if the ambient humidity is low, and may never be evident from ground level. Only during a unique range of favorable conditions will contrails persist and spread, both horizontally and vertically, producing a cloudlike sky.
Originally posted by LoveKnowledge
I have personally observed these trails at well below 23,000 ft.
Originally posted by Essan
reply to post by LoveKnowledge
But do you now accept that you're original assertion - that contrails cannot spread out and form cirrus clouds - was wrong? And that all available meteorological evidence shows that they can and do according to atmospheric conditions?
Once a contrail is produced it typically will last only a short time if the ambient humidity is low, and may never be evident from ground level. Only during a unique range of favorable conditions will contrails persist and spread, both horizontally and vertically, producing a cloudlike sky.
If so, then all you need do now is show - beyond any reasonable doubt - that such persistent contrails as you have observed occurred when the atmospheric conditions were not conducive to persistent contrail formation.
Originally posted by neformore
Originally posted by LoveKnowledge
I have personally observed these trails at well below 23,000 ft.
Again, as I have asked before, without visual references, looking straight up, without the aid of radar, how are you estimating height here?
23,000ft is 4.35 miles.
15,000ft is 2.84 miles
10,000ft is 1.89 miles.
5,000ft is 0.94 miles