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Hybrid Contrails

Contrails are generally classified into two types. Exhaust contrails and aerodynamic contrails. Exhaust contrails are formed by the mixing of the hot humid exhaust of the engines with cold humid surrounding air, creating long streamers of clouds. If the conditions are right then these can persist and spread. These are...
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Contrails Are Condensation, But Not Like Your Breath

The trails that aircraft leave in the sky are called “contrails”, which is short for “condensation trails”. They are formed by the condensation of the water vapor in the aircraft exhaust. When you breath out on a cold day, you see a little cloud of condensation form from...
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How Far Away is That Contrail?

  When you look up in the sky and you see a contrail, how far away is it? How far away are these contrails, a mile? two miles? Would you believe they are actually 20 to 100 miles away? Contrails typically form above 30,000 feet, or around six...
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Interactive Flight/Contrail Map Visualization

This link here will take you to the interactive map, but I suggest you first watch the video below which explains how it works (but watch it full screen, in HD), or look at some rather nice visualizations here. And to the point of the XKCD article, here’s...
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How Big is the Gap Between Contrails and Engines?

Contrails are the white lines that sometimes form behind high flying aircraft. They are actually a type of cloud. The cloud forms because jet exhaust contains quite a bit of water. If the humidity is high, then the contrails can persist for a long time, like clouds do....
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Contrail Avoidance and Mitigation Techniques

Contrails are the white trails that planes leave in the sky. They are a type of cloud, and are comprised of very fine ice crystals, like a cirrus cloud. If the air at high altitude is humid, then the contrail will continue to accrete ice, and can spread...
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Debunked: KMIR6 Geoengineering the Skies (chemtrails)

References: Geoengineering covers lots of different things, not just spraying things from planes http://en.wikipedia.org/wiki/Geoengineering KSLA Report, debunked and retracted http://contrailscience.com/barium-chemtrails/ Chaff is a real thing, and shows up on the weather http://www.crh.noaa.gov/lmk/?n=chaff-jan2006 But that’s a video of an aerodynamic contrail: http://contrailscience.com/aerodynamic-and-rainbow-contrails/ Contrails can persist and spread: http://contrailscience.com/persisting-and-spreading-contrails/ Levels...
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Contrail Simulations

One often gets satellite images of contrails and it’s hard to visualize what’s going on, especially with racetrack contrails drifting in the wind. So I wrote a little contrail simulator applet to demonstrate the formation of a contrail under various conditions.
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1980 NBC News Report on Contrails

This news report is from 1980. It’s based on this research paper: EFFECT OF CONTRAIL CIRRUS ON SURFACE WEATHER CONDITIONS IN THE MIDWEST (Searchable/Copyable OCR version here) It’s interesting because it shows that back in 1980 people were noticing contrails persisting and spreading to cover the whole sky. At...
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Where did all the planes go?

It’s a lovely Friday morning here in Los Angeles. Clear blue skies, not a cloud to be seen, and no contrails either. For that matter, there don’t appear to be any planes at all. I look up into the clear deep blue sky, and I can’t see a...
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How to Debunk Chemtrails

The chemtrail conspiracy theory seems to frequently misidentify ordinary contrails as “chemtrails” – some kind of secret spraying program. This theory comes in many flavors, and there’s a large number of things people bring up as “evidence” to support this theory. I’ve tried to gather all the debunks...
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Contrail Forecast

Sometimes planes leave contrails, and sometimes they don’t.  It depends on the weather, and specifically it depends on the weather at altitude.  It’s also very localized.  A plane might leave a trail in one region, and another plane a mile away might not leave a trail. NASA have...
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30 Years of Airline Travel

There are more contrails now than there were 20 or 30 years ago, because there are a lot more flights now. But it’s not entirely that simple. As well as more frequent flights, there are more routes. Areas that almost never saw a contrail would suddenly start seeing...
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Short Sunlit Contrails Look Like UFOs

[Original Post Dec 7 2010, updated Feb 13th 2011 with German contrail] This is a remarkably common news story:  It’s just after sunset, someone looks towards the west and they see the short contrail of a jet plane illuminated by the sun.  It looks red, like fire.  They...
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Contrail Grids are not Chemtrail Grids

One very popular photo amongst the “chemtrail” theorists is this one from NASA: The image is quite striking, showing a very large number of contrails over an area five hundred miles wide. It’s an infrared image which has been enhanced specifically to bring out the contrails. This image has been...
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New Mystery Missile, Padre Island Texas. Debunked

This must be the least missile-like mystery-missile ever. Taken Sunday, Jan 2nd, 2011, at “about three in the afternoon. The video shows a jet contrail – barely moving relative to the clouds. It’s just a jet that happened to fly directly overhead, so the approaching contrail looks vertical....
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Did Chemtrails Cause the Beebe Blackbird Deaths

No. In all likelihood, the birds’ death had a quite normal explanation. The weather. See my full article here: http://metabunk.org/content/134-Dead-Blackbirds-Fall-From-Sky-Prompting-Bunk and another of the media coverage, with links to some more examples of mass bird deaths. http://metabunk.org/content/137-Dead-Bird-Panic-How-Media-Focus-Distorts-a-Subject But if you really want to go down the “chemtrail” route....
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