Home » Archive by category contrails

Hybrid Contrails

A hybrid contrail below the parent exhaust contrail. The larger ice crystals in the hybrid contrail have caused it to fall quicker than the Exhaust Contrail, leading to considerable separation, even though they were originally part of the same trail.
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

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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?

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  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

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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?

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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

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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)

Metabunk 2019-02-15 06-48-04
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

Metabunk 2019-02-15 06-56-22
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

Metabunk 2019-02-15 06-58-39
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?

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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

A typical exhaust contrail
While the title of this post is “How to Debunk Chemtrails”, the actual debunking depends on what version of the theory needs debunking. The most common version is simply that “normal” contrails should not persist, so the persistent trails must be “chemtrails”. The simplest way to debunk this...
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Contrail Forecast

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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

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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

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[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

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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

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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

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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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Manu Ginobili’s Santa Monica Silver Surfer

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CASE CLOSED:  It was Red Bull Air Force! Update:  Here’s the google earth file I was forwarded an interesting video on TMZ a few days ago: http://www.tmz.com/2010/12/09/manu-ginobili-ufo-video-san-antonio-spurs/ It shows Manu Ginobili of the San Antonio Spurs as he observes some kind of UFO in the sky behind him....
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Contrails are Usually Horizontal

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I think the one thing that prevented most people from seeing the supposed “missile” trail as what it was (a jet contrail, almost certainly from flight UPS902 from Hawaii), was the illusion that it looked like it was going straight up. Compare one photo of the 902 trail...
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Debunked: What In The World Are They Spraying?

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Update: If you are looking for a debunking of Why In The World Are They Spraying, first check out this post, as the second film really depends on the first being true, then have a look at the various errors in Why In The World Are They Spraying, detailed...
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Fake, Hoax, Chemtrail Videos

Metabunk 2019-02-15 07-57-42
Most of the supposed “chemtrail” videos out there are simply videos of persistent contrails that the video maker somehow has decided are part of a giant world-wide conspiracy involving spraying something for some purpose. But some videos are actually deliberate hoaxes, either by pranksters poking fun at the...
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Contrails and Chemtrails: The IFAQ

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Most of the traffic to this site comes via Google and other search engines. It’s interesting to look at what people typed in to that ended up here. Quite often it’s just a few words like “chemtrail aircraft pictures” or “contrails engine”, but sometimes it’s a question. I...
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Volcano Clears the Skies of Contrails

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The cloud of volcanic ash from Eyjafjallajökull has prompted the most significant air-traffic shutdown in European history.  This will provide a unique opportunity to study the effects of a contrail-less sky.  But we must be careful how quickly we draw conclusions from the immediate data. Take the two images above,  the...
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Why do some planes leave long trails, but others don’t?

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Some planes in the sky leave trails that persist and spread, and other planes, in the same sky, leave short-lived trails, or no trails at all. These trails are actually called contrails, short for “condensation trails”.  They are not smoke from the engines, they are formed when the...
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Why Planes Make Vapor Trails

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Popular Science, March 1943. Page 55. While this applies to 1943 planes, it should also be noted that the exact same mechanisms are responsible for contrails from modern jet aircraft. Jet engines burn fuel that is essentially the same kind of chemical as used by old prop planes....
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Identifying a Curved Contrail

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I took this photo this morning: It’s an interesting contrail as most trails you see are straight lines, planes generally fly directly from one place to another. This plane was flying in a south east direction. After making this left turn it made a right turn to continue...
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Contrail Season in Los Angeles

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For a contrail enthusiast, I picked the wrong place to live. We hardly ever get persistent contrails here in the summer, but things have been picking up a bit as we go into fall, and today we had this: A very nice triple set of contrails of three...
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Chemtrail Plausibility Study

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(The following was written as a comment by “boenoid”, but I thought it was interesting enough to deserve its own post. I (Mick) have added the assembly line image) For what it is worth, I am a Boeing engineer with 20 years of experience in the aerospace industry....
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AC-130 Flares and Chaff

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Not a contrail, but a nice image: A U.S. Air Force AC-130 Gunship aircraft executes an evasive maneuver and drops chaff and flares during a firepower demonstration at the Nevada Test and Training Range in Nevada on Sept. 14, 2007. http://www.defenselink.mil/photos/newsphoto.aspx?newsphotoid=9540 I don’t know if you can actually...
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A Very Unusual Contrail

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Okay, it’s not actually a contrail.   But it’s a related phenomenon – a plume of hot humid air is rising from a volcano, and where it hits the cold upper air, the water vapor it contains condenses out.  Possibly into ice, but it’s hard to tell. The brown...
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Modern Contrail Confusion

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This photo is from January 29th 2009, at approximately 3-4PM over Corvallis, Oregon. It shows a contrail from a plane that has made a 540 degree turn (one and half full turns) to fly back the way it came.  This photo was probably taken an hour after the...
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Ground Level Contrails

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Contrails form when the water in engine exhaust mixes with cold moist air and freezes. Normally you see this at 30,000 feet with jet engine exhaust. But in some parts of the world, these conditions can be found at ground level. Here’s a car leaving a contrail in...
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Life Magazine Contrail Photos

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[UPDATE: Some of these photos are now available again with a “personal non-commercial use” licence via Google. http://images.google.com/hosted/life The following images were all found on the Life Magazine web site. Originally they linked to the page on Life where the photo could be ordered, but Life has since...
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Cirrus Uncinus and Contrails

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I took these photos around 8AM this morning, Feb 4th 2009, in Los Angeles. They show Cirrus Uncinus clouds, with a contrail running through them. Cirrus uncinus clouds (or “Mares’ Tails”), according to wikipedia: Cirrus uncinus is a type of cirrus cloud. The name cirrus uncinus is derived from Latin, meaning “curly hooks”....
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Twilight Zone Contrails

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I was watching the first episode of The Twilight Zone, Where is Everybody, made in 1959, and I noticed that the movie poster had a nice depiction of some persistent contrails forming a grid: I don’t think it’s a real poster, but it’s a real movie (Battle Hymn,...
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Things are not as they seem

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This is an actual photo, not photoshopped. The stork is not at the same altitude as the contrail, it’s actually quite a bit lower.   It’s the same thing when you see two planes, one making a contrail, and one not – they are just at different altitudes.
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Voodoo Contrails over Los Angeles

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I was walking along this morning at around 10AM, when I noticed a huge semi circular contrail, somewhere to the south of LAX.  This is something I’ve never seen before.  The weather was very well suited for contrails, and there were quite a few criss-crossing the sky. Then...
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People Don’t Notice Contrails

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I find clouds fascinating.   If I see a lenticular cloud while driving I might nearly crash the car while straining for a better view.   I’ve only seen mammatus clouds once in my life, and stopped to try to take a photo.  I’m quite fascinated by contrails...
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Memphis Belle WWII Bomber Contrails – 1944

Metabunk 2019-02-15 08-20-13
This is an excerpt from the 1944 film “The Memphis Belle: A Story of a Flying Fortress”. The full original film is public domain, and can be found here: http://www.archive.org/details/TheMem… The film shows contrail formation, including showing “broken” contrails. http://www.youtube.com/watch?v=wfOrez6q7WM Make sure you listent to the audio, as...
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Fighter and Bomber Contails, 1940s

ca. August 1944, London, England, UK --- Vapour trails left by British bombers on route to attack flying-bomb sites encircle the dome of St. Paul's Cathedral. London, 1944. --- Image by © Hulton-Deutsch Collection/CORBIS
Contrails are a common sight now, but prior the the advent of commercial jet travel in the late 50s, there was little reason for planes to fly high enough to form contrails.  However, during the Second World War, high altitude airial dogfights over the UK were quite common....
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Aerodynamic and Rainbow Contrails

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You occasionally see very pretty photos of contrails, like this one: Very pretty.  But what is it?  It’s clearly not a regular exhaust contrail, as the trail seems to start actually ON the wing, and it has a weird rainbow effect you don’t often find in exhaust contrails....
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Clouds before Planes – Cloud Studies 1905

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The book “Cloud Studies” was published in 1905, over a hundred years ago.  It was written by Arthur W. Clayden, M.A., Former principal of University College, Exeter, UK. The book is available in PDF form since it’s out of copyright: http://contrailscience.com/files/Cloud_Studies.pdf But the images are rather low quality,...
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WWII Contrails

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There are lots of photos of contrails from World War II. I’ve collected a few of them here: https://plus.google.com/photos/107393796095434664991/albums/5235534135256807809 The collection shows all types of contrail formation – from the very short ones, to long persistent trails that spread out like cloud cover. Why so many photos of...
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Britain From Above – Air Traffic

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There’s a great new series on the BBC in the UK: Britain From Above, that shows how various things look from a high perspective, using very interesting visualization techniques. One of the most interesting (for me) was an episode that showed all the air traffic in UK airspace...
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Things That Are NOT Contrails (or Chemtrails)

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Contrails are long thin clouds of ice crystals that form behind planes that fly through freezing cold air. Usually you see them behind jets at around 30,000 feet.  If the air they fly though has enough moisture in it already, then these contrail clouds can last for a...
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Chemtrail Non-science

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I’m very interested in contrails, but when you look for information about them on the internet, half the sites that turn up are about a conspiracy theory which claims that any trail that last more than a few minutes is actually a “chemtrail”, comprised of dangerous chemicals, particularly...
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Thirty Contrails, Forty Years Ago

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This photo has the largest number of contrails I’ve seen in a single photo: There seem to be at least 30, possibly more (click the photo for a larger verision).  What is even more remarkable is that it was taken sometime before 1967.  That’s over forty years ago....
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Germans Admit They Used Düppel!

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Another bit of “Chemtrail” mythology was born with this YouTube video: http://www.youtube.com/watch?v=FiUMfsR28SM This video has been seized upon by the Chemtrail community as evidence that “chemtrails” are real, and that the German government has admitted they are spraying “chemtrails”. Unfortunately the entire video is a very bad translation...
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How Long do Contrails Last?

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Q) How long do contrails last? A) According to all the books on clouds in the last 70 years, contrails last anywhere from less than a second, up to several hours. If depends on the atmospheric conditions at the altitude the plane is flying. It’s unrelated to the...
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Contrails Above and Below

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I took this photo on December 16, 2007, at around noon. It’s facing south from Los Angeles, California. It was a particularly good day for contrails. You can see about seven in this photo. There’s also a nice contrail shadow, and a halo around the sun. I was...
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Some more WWII Contrails

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Here’s a newly discovered photo of contrail in WWII, this was taken by William Anderson, and uploaded by a grandchild of his, here. ( Creative Commons, Some rights reserved)   Update: The photo album has been updated with a much better scan:   You can see it’s taken...
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Racetrack Contrails

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Here’s a contrail you don’t see every day: the racetrack contrail (or, as I like to call this one, the paperclip contrail) This photo was taken near Portland, Oregon on December 11th, 2005, at around 11AM. So why would a plane be flying in this unusual pattern? Well,...
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Pre WWII Contrails

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The Wright Brother’s first achieved powered flight in 1903. They only got a few feet off the ground, so of course did not leave a contrail. However it was barely more than a decade before planes inched into colder air, and the first reports began. The earliest known...
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Contrail to Distrail

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It’s been interesting weather here in Los Angeles, as a couple of storm systems have rolled through we’ve had some days of nice looking clouds, and some days with lots of contrails. I snapped this one this morning: It shows a contrail from the lower left that then...
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Early Contrails

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Either by day or a little after sunset, in fine weather, a little, light, long-drawn cloud is seen, like a long very straight line. – Aristotle, Meteorologica, 340BC Not every long straight line in the sky is a contrail. Here Aristotle suggests it’s “a sort of wave-mark in...
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Barium Chemtrails on KSLA

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Brief Summary: Samples of water were collected in August 2007, in Stamps Arkansas, by leaving some bowls outside for a month The resultant dirty water was tested by KSLA and was found to have the same amount of barium in it as most municipal tap water. The reporter...
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Where are all the Chemtrail Photos?

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Some people think that persistent spreading contrails are somehow unusual, and are actually something dangerous being deliberately sprayed on the US people by the government, or perhaps for weather control purposes. They call these persistent contrails “chemtrails”. Some of them are very insistent that this is a practically...
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Hole Punch Clouds in Los Angeles

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I’ve talked about distrails and hole punch clouds before, but I’ve actually never seen one myself until this morning, when I saw two side by side. It’s quite rare to have this kind of weather condition in Los Angeles. I took a couple of photos at around 7:30AM...
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Contrail Gaps and other Questions

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There was an interesting post over on the New York SkyWatch blog, which raised many of the common questions that people have about various contrail anomalies. I’ve attempted to answer all of the questions here: Question #1, why [do] jet contrails appear as if the jet engine is...
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Broken Contrails and Contrails with Gaps

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Contrails are clouds made from water vapor that condenses then freezes behind a plane engine. Since the engines are on constantly, it seems a bit odd when you see contrails with gaps in them, or even contrails that stop and start. If the engine is pumping out a...
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Contrails, Dark Lines, Black Beams, & “Chemtrails”

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People who think persistent contrails indicate some kind of conspiracy (which they call “chemtrails”), sometime point to the “dark lines” that sometimes accompany contrails. Since they can’t immediately think of why these dark lines should be there, they assume it’s part of the conspiracy. Either there is some...
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Measuring the height of contrails

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How high are those contrails? That’s a very important issue if you are investigating the science of contrail formation. I’ve been thinking for a while that a good method might be to take photos at a plane at a known focal length on a digital camera, and then...
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Contrails In the Movies

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I like these contrails from the movie Cars: They look a little odd at first, but if you look closely (click on the image to expand it) you can see they are actually tire tracks. Here’s some more pics, from a site that thinks the government had these...
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Chemtrail Myths

Some people believe that the government is spraying something into the air, and this creates unsual looking contrails. They call these “chemtrails”. Now, there is no real evidence that “chemtrails” are real, but there are several myths on the internet about “chemtrails”. All these myths can very easily...
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The opposite of contrails

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The opposite of a contrail is a “distrail”. When a jet flies through a high cloud then various factors to do with the passage of the jet are sufficient to trigger precipitation in the cloud, leaving holes or trails. The precipitation can spread outwards quite a distance. This is a...
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Persisting and Spreading Contrails

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Do contrails sometimes persist and spread out? Yes, see the Encyclopædia Britannica article on vapour trails (contrails): Contrail, streamer of cloud sometimes observed behind an airplane flying in clear, cold, humid air. It forms upon condensation of the water vapour produced by the combustion of fuel in the...
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