JazzRoc versus “Chemtrails”

Contrail Facts and “Chemtrail” Fictions

Posts Tagged ‘relative

Trails Seen from Space

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A monochrome view of the North Atlantic Ocean by AtlanticSat shows Greenland, Iceland, the British Isles, and part of Norway. Prominent in the photo is a north-south ridge of high pressure, with cold dry air to the west, and warmer wetter air to the east. Aircraft approaching or leaving this ridge have struck permanent contrail conditions on its west side. The trails are at even intervals which suggest there are only TWO great-circle routes involved (London-New York and London LAX) with regular flights from each. The stratosphere (where the trails are) is obviously moving north-to-south.
The trails peter out approaching or leaving the British Isles, where the wetter conditons don’t obtain (for a change).
Chemtrailers must ask themselves why the pilots’ aim was so poor…



Here we are centered roughly over Hamburg; Copenhagen is right center top and the Baltic Sea further to the right. We are looking at a “triangle” of air travel activity between Kiel (center top), Berlin (bottom right) and the Rhineland (bottom left).
You can see evidence that the stratosphere is sliding along at possibly 100kph from the northwest – maybe!



I originally thought these were local control surface vortices, but I have been better advised since, by Jay Reynolds. Thanks, Jay!


The Crow instability is a vortex pair instability, and typically goes through several stages:
– A pair of counter rotating vortices act upon each other to amplify small sinusoidal distortions in their vortex shapes (Normally created by some initial disturbance in the system).
– The waves develop into either symmetric or anti-symmetric modes, depending on the nature of the initial disturbance.
– These distortions grow, both through interaction from one vortex on another, and also ‘Self Induction’ of a vortex with itself. This leads to an exponential growth in the vortex wave amplitude.
– The vortex amplitudes reach a critical value and reconnect, forming a chain of vortex rings.

Initially the vortex pair falls rapidly downward. Perturbations of the vortices from the ambient atmosphere grow in a sinusoidal mutual inductance instability (the Crow instability). Eventually the vortices touch, reconnect and form vortex rings which oscillate, interact with themselves and the atmospheric turbulence and stratification, and finally dissolve. During their lifetime the rings continue to drop, giving rise to the periodic series of puffs often seen in contrail evolution.
These are spin-stabilized and follow the deflected air and take a while to spin to a stop. Ice is precipitated out of the -40 deg C water vapor in the vortex vacua. Altogether an intriguing visual phenomenon!
http://www.cerfacs.fr/cfd/wake_vortex_26.php is a useful reference…

And this low-quality video reveals…

And this high-quality video shows how far our understanding has progressed…

# A vortex (plural: vortices) is a spinning, often turbulent, flow of fluid.  Any spiral motion with closed streamlines is vortex flow. …

Vortices display some special properties:
* The fluid pressure in a vortex is lowest in the center (where the speed is greatest) and rises progressively with distance from the center. This is in accordance with Bernoulli’s Principle. The core of a vortex in air is sometimes visible because of a plume of water vapor caused by condensation in the low pressure of the core. The spout of a tornado is a classic and frightening example of the visible core of a vortex. A dust devil is also the core of a vortex, made visible by the dust drawn upwards by the turbulent flow of air from ground level into the low pressure core.

* The core of every vortex can be considered to contain a vortex line, and every particle in the vortex can be considered to be circulating around the vortex line. Vortex lines can start and end at the boundary of the fluid or form closed loops. They cannot start or end in the fluid. (See Helmholtz’s theorems.) Vortices readily deflect and attach themselves to a solid surface. For example, a vortex usually forms ahead of the propeller disk or jet engine of a slow-moving airplane. One end of the vortex line is attached to the propeller disk or jet engine, but when the airplane is taxiing the other end of the vortex line readily attaches itself to the ground rather than end in midair. The vortex can suck water and small stones into the core and then into the propeller disk or jet engine.

* Two or more vortices that are approximately parallel and circulating in the same direction will merge to form a single vortex. The circulation of the merged vortex will equal the sum of the circulations of the constituent vortices. For example, a sheet of small vortices flows from the trailing edge of the wing or propeller of an airplane when the wing is developing lift or the propeller is developing thrust. In less than one wing chord downstream of the trailing edge of the wing these small vortices merge to form a single vortex. If viewed from the tail of the airplane, looking forward in the direction of flight, there is one wingtip vortex trailing from the left-hand wing and circulating clockwise, and another wingtip vortex trailing from the right-hand wing and circulating anti-clockwise. The result is a region of downwash behind the wing, between the pair of wingtip vortices. These two wingtip vortices do not merge because they are circulating in opposite directions.

* Vortices contain a lot of energy in the circular motion of the fluid. In an ideal fluid this energy can never be dissipated and the vortex would persist forever. However, real fluids exhibit viscosity and this dissipates energy very slowly from the core of the vortex. (See Rankine vortex). It is only through dissipation of a vortex due to viscosity that a vortex line can end in the fluid, rather than at the boundary of the fluid. For example, the wingtip vortices from an airplane dissipate slowly and linger in the atmosphere long after the airplane has passed. This is a hazard to other aircraft and is known as wake turbulence.

Cause and effects
A wing generates aerodynamic lift by creating a region of lower air pressure above it. Fluids are forced to flow from high to low pressure and the air below the wing tends to migrate toward the top of the wing via the wingtips. The air does not escape around the leading or trailing edge of the wing due to airspeed, but it can flow around the tip. Consequently, air flows from below the wing and out around the tip to the top of the wing in a circular fashion.  This leakage will raise the pressure on top of the wing and reduce the lift that the wing can generate. It also produces an emergent flow pattern with low pressure in the center surrounded by fast-moving air with curved streamlines.  Wingtip vortices only affect the portion of the wing closest to the tip. Thus, the longer the wing, the smaller the affected fraction of it will be. As well, the shorter the chord of the wing, the less opportunity air will have to form vortices. This means that for an aircraft to be most efficient, it should have a very high aspect ratio.  This is evident in the design of gliders.  It is also evident in long-range airliners, where fuel efficiency is of critical importance.  However, increasing the wingspan reduces the maneuverability of the aircraft, which is why combat and aerobatic planes usually feature short, stubby wings despite the efficiency losses.

Another method of reducing fuel consumption is the use of winglets, as seen on some modern airliners such as the Airbus A340. Winglets work by forcing the vortex to move to the very tip of the wing and allowing the entire span to produce lift, thereby effectively increasing the aspect ratio of the wing.  Winglets also change the pattern of vorticity in the core of the vortex pattern, spreading it out and reducing the kinetic energy in the circular air flow, which reduces the amount of fuel expended to perform work by the wing upon the spinning air. Winglets can yield worthwhile economy improvements on long-distance flights.

Visibility of vortices due to water condensation and freezing

The cores of the vortices are sometimes visible because water present in them condenses from gas (vapor) to liquid, and sometimes even freezes, forming ice particles.  The phase of water (i.e. whether it assumes the form of a solid, liquid, or gas) is determined by its temperature and pressure.  For example, in the case of liquid-gas transition, at each pressure there is a special “transition temperature” Tc such that if the sample temperature is even a little above Tc, the sample will be a gas, but if the sample temperature is even a little below Tc, the sample will be a liquid; see phase transition.

For example, at the standard atmospheric pressure, Tc is 100 °C = 212 °F.  The transition temperature Tc decreases with decreasing pressure (which explains why water boils at lower temperatures at higher altitudes and at higher temperatures in a pressure cooker; see here for more information).  In the case of water vapor in air, the Tc corresponding to the partial pressure of water vapor is called the dew point. (The solid-liquid transition also happens around a specific transition temperature called the melting point. For most substances, the melting point also decreases with decreasing pressure, although water ice in particular—in its Ih form, which is the most familiar one—is a prominent exception to this rule.)
Vortex cores are regions of low pressure. As a vortex core begins to form, the water in the air (in the region that is about to become the core) is in vapor phase, which means that the local temperature is above the local dew point. After the vortex core forms, the pressure inside it has decreased from the ambient value, and so the local dew point (Tc) has dropped from the ambient value. Thus, in and of itself, a drop in pressure would tend to keep water in vapor form: the initial dew point was already below the ambient air temperature, and the formation of the vortex has made the local dew point even lower.
However, as the vortex core forms, its pressure (and so its dew point) is not the only property that is dropping: the vortex-core temperature is dropping also, and in fact it can drop by much more than the dew point does, as we now explain.
To a first approximation, the formation of vortex cores is thermodynamically an adiabatic process, i.e. one with no exchange of heat. In such a process, the drop in pressure is accompanied by a drop in temperature, according to the equation

Here Ti and pi are the absolute temperature and pressure at the beginning of the process (here equal to the ambient air temperature and pressure), Tf and pf are the absolute temperature and pressure in the vortex core (which is the end result of the process), and the constant γ is about 7/5 = 1.4 for air.
Thus, even though the local dew point inside the vortex cores is even lower than in the ambient air, the water vapor may nevertheless condense—if the formation of the vortex brings the local temperature below the new local dew point. Let us verify that this can indeed happen under realistic conditions.  For a typical transport aircraft landing at an airport, these conditions are as follows: we may take Ti and pi to have values corresponding to the so-called standard conditions, i.e. pi = 1 atm = 1013.25 mb = 101\,325 Pa and Ti = 293.15 K (which is 20 °C = 68 °F).

We will take the relative humidity to be a comfortable 35% (dew point of 4.1 °C = 39.4 °F). This corresponds to a partial pressure of water vapor of 820 Pa = 8.2 mb.

We will assume that in a vortex core, the pressure (pf) drops to about 80% of the ambient pressure, i.e. to about 80 000 Pa.
Let us first determine the temperature in the vortex core. It is given by the equation above as

Next, we determine the dew point in the vortex core. The partial pressure of water in the vortex core drops in proportion to the drop in the total pressure (i.e. by the same percentage), to about 650 Pa = 6.5 mb. According to a dew point calculator at this site (alternatively one may use the Antoine equation to obtain an approximate value), that partial pressure results in the local dew point of about 0.86 °C; in other words, the new local dew point is about equal to the new local temperature.
Therefore, the case we have been considering is a marginal case; if the relative humidity of the ambient air were even a bit higher (with the total pressure and temperature remaining as above), then the local dew point inside the vortices would rise, while the local temperature would remain the same as what we have just found. Thus the local temperature would now be lower than the local dew point, and so the water vapor inside the vortices would indeed condense.
Under right conditions, the local temperature in vortex cores may drop below the local freezing point, in which case ice particles will form inside the vortex cores.
We have just seen that the water-vapor condensation mechanism in wingtip vortices is driven by local changes in air pressure and temperature. This is to be contrasted to what happens in another well-known case of water condensation related to airplanes: the contrails from airplane engine exhausts. In the case of contrails, the local air pressure and temperature do not change significantly; what matters instead is that the exhaust contains both water vapor (which increases the local water-vapor concentration and so its partial pressure, resulting in elevated dew point and freezing point) as well as aerosols (which provide nucleation centers for the condensation and freezing).
Condensation of water vapor in wing tip vortices is most common on aircraft flying at high angles of attack, such as fighter aircraft in high g maneuvers, or airliners taking off and landing on humid days.

A vortex can be seen in the spiraling motion of air or liquid around a center of rotation. Circular current of water of conflicting tides form vortex shapes.
Turbulent flow makes many vortices. A good example of a vortex is the atmospheric phenomenon of a whirlwind or a tornado or dust devil. This whirling air mass mostly takes the form of a helix, column, or spiral. Tornadoes develop from severe thunderstorms, usually spawned from squall lines and supercell thunderstorms, though they sometimes happen as a result of a hurricane.

In atmospheric physics, a mesovortex is on the scale of a few miles (smaller than a hurricane but larger than a tornado). On a much smaller scale, a vortex is usually formed as water goes down a drain, as in a sink or a toilet. This occurs in water as the revolving mass forms a whirlpool. This whirlpool is caused by water flowing out of a small opening in the bottom of a basin or reservoir. This swirling flow structure within a region of fluid flow opens downward from the water surface.


* In the hydrodynamic interpretation of the behavior of electromagnetic fields, the acceleration of electric fluid in a particular direction creates a positive vortex of magnetic fluid. This in turn creates around itself a corresponding negative vortex of electric fluid.
* Smoke ring : A ring of smoke which persists for a surprisingly long time, illustrating the slow rate at which viscosity dissipates the energy of a vortex.
* Lift-induced drag of a wing on an aircraft.

* The primary cause of drag in the sail of a sloop.
* Whirlpool: a swirling body of water produced by ocean tides or by a hole underneath the vortex where the water would drain out, such as a bathtub. A large, powerful whirlpool is known as a maelstrom. In popular imagination, but only rarely in reality, they can have the dangerous effect of destroying boats. Examples are Scylla and Charybdis of classical mythology in the Straits of Messina, Italy; the Naruto whirlpools of Nankaido, Japan; the Maelstrom, Lofoten, Norway.

* Tornado : a violent windstorm characterized by a twisting, funnel-shaped cloud. A less violent version of a tornado, over water, is called a waterspout.
* Hurricane : a much larger, swirling body of clouds produced by evaporating warm ocean water and influenced by the Earth’s rotation. Similar, but far greater, vortices are also seen on other planets, such as the permanent Great Red Spot on Jupiter and the intermittent Great Dark Spot on Neptune.

* Polar vortex : a persistent, large-scale cyclone centered near the Earth’s poles, in the middle and upper troposphere and the stratosphere.
* Sunspot : dark region on the Sun’s surface (photosphere) marked by a lower temperature than its surroundings, and intense magnetic activity.
* The accretion disk of a black hole or other massive gravitational source.
* Spiral galaxy : a type of galaxy in the Hubble sequence which is characterized by a thin, rotating disk. Earth’s galaxy, the Milky Way, is of this type.

# VORTEX – The Verification of the Origins of Rotation in Tornadoes Experiment or VORTEX, field projects study tornadoes. VORTEX1 was the first time scientists completely researched the entire evolution of a tornado enabling a greater understanding of the processes involved with tornadogenesis. …



As explained previously, vortices that come into contact with each reconfigure each other, regenerating intermediate “rings”, and ALL vortices will “stick” to a plane surface – like the ground (tornado), or the face of a building (World Trade Center Tower 2).

The Boeing 767, weighing around 180,000 kilograms and traveling at 260 meters/second, was pulling up in about a 2G banking turn before it struck the tower, so the energy it was putting into its (invisible) WAVE VORTEX was twice the normal, it occurred to me, so might not there be EVIDENCE of its existence in the smoke and dust after the collision?

Evidence there is, in embarrassing plenty. Embarrassing for “no-planers”, anyway, if they were to be well-informed and curious enough to CONTINUE TO WATCH after the collision took place. An oxymoron, I think.

Check back to confirm this if you like…

So now “no-planers” would HAVE to claim that the video artists that “falsified” these images were experts in aerodynamics as well.

To which the answer is OCCAM…




In this case the fifth… is the trail left by the APU (Auxiliary Power Unit) which is a normal (but small) gas turbine/electrical generator set. As with the main engines, it burns kerosine to form carbon dioxide and steam. As with the main engines, it leaves a trail. But where’s it coming from?


“the whole plane is spraying”


When stratospheric air is very clean and stable it may contain MORE water vapour than it does when it is described as having 100% Relative Humidity. The slightest disturbance to it will cause ice crystals to precipitate out of it. It cannot go into super-saturation if there are ANY nucleative materials of any sort in this air.
Here is just such a case, which occurs on occasion in the sub-tropical stratosphere. The trail forms by “burst condensation” into super-cooled droplets which are microscopic initially and can refract sunlight by interference. Over a small space of time these droplets grow progressively as water vapor deposits more supercooled water into them. As they progressively increase their size they run through a progression of light frequencies which they interfere with. This is NOT a refraction effect.

Chemtrailers claim the colors to be indicative of “foreign materials” which is quite the reverse of the truth; only pure water will do this, and only pure air will have become supersaturated in the first place.
The fact that in supersaturated conditions, large aircraft can place thousands of tons of ice into the stratosphere is covered by the paper “Contrails to Cirrus” mentioned in the INTRODUCTION page.



“Gaps” are claimed by chemtrailers as “evidence that planes are spraying”. Such gaps will of course appear in any persistent contrail where the stratospheric air RH falls below 100%. Generally, of course, the humidity tails off gradually, and the transition of trail-to-no-trail is quite indistinct.
In THIS case, the “transition” is a hard and sharp right angle. Too sharp, in fact, for a whirling twin-vortex contrail… Close inspection of the “sky” each side of the “gap” shows it to be comprised of a chemtrailer’s vertical “airbrush strokes”! Naughty!



Here we have an aircraft actually spraying something; it’s fuel. If some in-flight emergency occurs and the plane must make a quick landing, it must first lose weight, for it cannot land at its take-off weight. Some of its fuel must GO.

Chemtrailers are quick to claim this shot as “spraying evidence”.



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“those sky-grids” – you’re about to get the works on that from ME.

“scientific evidence proves that a great increase of planes cannot affect the upper stratosphere” – NO, IT DOESN’T AT ALL. Few aircraft fly in the UPPER stratosphere. They fly in the lower stratosphere, just above the tropopause. The stratosphere is easily affected by combustion exhaust water, because it is stable, and has only sublimation into water vapor, and the force of gravity upon the ice crystals, causing them to fall, as mechanisms for removal. Contrails spread in saturated or supersaturated conditions to cover the whole sky. What scientific evidence is this?


“you’re implying that air-layers combine suitably within an hour” – stratospheric layers don’t combine at all, but they may be filled with ice crystals as the planes’ wave vortices stir the layer contents.

“50’s, 60’s and 70’s disseminated all over Britain (millions of ppl affected)” – YOU’RE MISTAKEN AGAIN. Didn’t you know that WATER, KILLED BACTERIA, and a PHOSPHORESCENT DYE are HARMLESS? Please refer to me the records indicating that millions of people were affected. And, anyway, wasn’t this to do with finding out how to combat Russian germ warfare attack? Before you make free with the FALSEHOODS you should look up contrailscience.com and find out how your blathering stands up to reality. And for a further perspective on Man versus Nature you could look up my blog on:



I’ve debated the contrail vs. chemtrail theories with jazzroc for the past couple of months. I did present a well researched and thought out scientific argument to him. His response was to delete my comments from his weblog, and to block any comments I post.

That’s because:

a) you didn’t debate anything: you posted using an anonymous email address – once. That isn’t a debate. If you look in that inbox you’ll find letters from me still awaiting your response.

b) your research was poor and your science non-existent. There was nothing in your post which advanced anything. Except sophistry.

Contrails are known and measured as part of atmospheric science. It is “chemtrails” that is a theory.

What about the Bergeron-Findeisen theory? Can persistent contrails exist if the Bergeron-Findeisen theory were true?

If there ARE differing vapour pressure requirements for deposition of water onto either super-cooled droplets or ice crystals, then the Bergeron-Findeisen Theory is true, and the droplets will evaporate in favour of deposition onto the ice crystals. The evaporation will then raise the humidity, making it even more likely that the next aircraft will leave a permanent trail. Super-cooled droplets are produced aerodynamically over the wings in marginally-warmer conditions: the exhausts produce ice crystals at -40 or colder, which is the general rule over 30,000 feet.

But that makes no difference to the final outcome, which is that persistent contrails are clouds of ice crystals which cannot evaporate into the fully-saturated atmosphere which surrounds them.

Nor to the conclusions one can draw, which are:

a) that persistent trails are natural, and not the confirmation of “chemtrails”, and

b) all other “proofs” having been shown to be fraudulent, the case for “chemtrails” is non-existent.

Were you to study any physics at all, your “theory” would vanish, your “debate” disappear. 


“tell not contrails” – NO YOU CANNOT. See below.

“My entire life this never happened” – It was happening BEFORE YOU WERE BORN.

“I watch planes/real contrails, and they disappear, but these chemtrails DO Not” – Your assumption is INCORRECT. Contrails CAN and DO persist in HUMID stratospheric conditions.

“only spray where the population lives” – Above every town is a RISING PLUME of HEAT and HUMIDITY. Contrails MAY persist in these plumes. Also you may care to check out satellite pictures from space, which show quite clearly that the trails form within humid atmospheric conditions.

“How stupid do they think people are?” – How stupid do you wish to remain?

“back and forth over the towns” – These are SEPARATE planes, each either COMING or GOING. No videos have ever shown a “spraying” plane circling to respray a town, because these aircraft are civil flights from one major airport to another.

“Why?” – Your answer’s above…

“targeting these areas/get the full benefit of the poisons” – JUST BULLSHIT AND BLUSTER (LIES). Just dial up a satellite view and you will see contrails wherever the atmosphere is moist. That is, randomly over land AND ocean, wherever the conditions are HUMID.



It is YOU that has been handed a line – which you cannot handle.

Don’t send me any more “information”. I am a very fast reader and have read and seen everything you’ve seen.

You have a problem with reasoning. Any reasonable educated person would listen to Carnicom for about FIVE minutes, and then switch him off. The reason he would do that is that he breaks all the rules of journalism and science. Instead of supplying EVIDENCE and PROOF he makes further assertions, breaking the “legal” chain of evidence. If you cannot see that I am sorry for you, but I’m no longer prepared to help you.

What makes you think that airborne materials MUST have come from an airplane, for instance? Do you KNOW how far vapour trail materials DRIFT? I don’t even need a calculator to tell you – from an altitude of seven miles it’s going to be AT LEAST TWO HUNDRED MILES DOWNWIND.

What makes you think that as you read this, you are NOT ingesting pathogens and metals? I can tell you that, for sure, you ARE, AND HAVE ALWAYS BEEN INGESTING THEM. YOU ALWAYS WILL.

Your body is a DYNAMIC device, evolved over 4 billion years to COPE with such stresses. It WILL eliminate those metals AND KILL those pathogens.


It’s just a question of degree…

You lack the scientific understanding to prevent you from freely believing the UNBELIEVABLE.


“Namely, they persist for hours (eventually turning into a haze that doesn’t go away”

They’re in the stratosphere. That is, above five miles UP, about a fifth of atmospheric pressure, as warm as -40 deg C, maybe as cold as -80 deg, which is colder than the surface of Mars.


Passing planes laying 100lb of ICE per mile will SOON saturate the stratospheric layer they are in. Once that happens, the ice of the trail CANNOT SUBLIME ANY MORE INTO WATER VAPOUR. It MUST remain. It WILL persist for hours. The only reason it doesn’t persist for EVER, is that it is HEAVY, and FALLING.

“water doesn’t act that way” -You are WRONG. Water in the stratosphere is ICE. Not ice like in your fridge, more like finely powdered GLASS. I’ve lived in Germany, and deep in the continental land mass the temperature can fall very low in winter. I have experienced -40 deg C, and let me tell you ICE ISN’T EVEN SLIPPERY AT -40 DEG C. It is HARD and it is DRY. Say you were in a balloon at 32,000 feet and an Airbus came just by you at 575mph.


You’d be amazed at its speed, and also its colossal WAVE VORTEX, as it whirled the two trails around itself in two columns fifty yards across. The trail would sting your face like wind-whipped sand on a beach. Of course, your face would fall off with the intense cold as well…

“they are sprayed from unmarked aircraft” – WRONG AGAIN. They are marked, but the markings become invisible from the ground due to a phenomenon called “blue light scattering”. Had the plane been painted BLACK, from the ground you would see NO PLANE AT ALL

“they stop and start in a manner not consistent with normal contrail formation” – WRONG AGAIN. They start and stop PERFECTLY consistent with normal contrail formation. The trails are created in saturated or supersaturated air. The “inconsistency” is firmly in your understanding of the nature of the stratosphere.

Your mistake lies in assuming that these AIRS are DISTINGUISHABLE: they are NOT. All types of air are TRANSPARENT, get it? INVISIBLE! Hence a plane flying through dry air leaves no trail. It hits a humid area: it leaves a trail. Stop, start, stop, start. This can happen for miles: stratospheric layers frequently form ripples as a consequence of atmospheric compressibility following on downwind from upward ground projections such as ridges and mountains…


“photographed as not even coming from the engines” – That’s right. Either a) You don’t understand that the time taken for the exhaust to cool down from +1100 degrees to -40 degrees manifests itself as a GAP, or b) the plane has hit SUPERSATURATED air, when the WHOLE AIRFRAME sets a trail and the tightest vortices (wingtips, control surface ends) will cause the MOST ICE to get dumped.

“I don’t remember them as a child or teen” – I DO. I was always keen on aircraft, making them from the age of 7. Why would you? You wouldn’t be LOOKING for them. In our lifetime we’ve seen a TREMENDOUS increase in low-cost air travel, and a VERY RECENT increase in cheap videocams, and reduction in educational standards…


“the media will not talk about the issue” – They only talk about things that increase their sales. They also have good scientific advice which deters them from printing unconsidered rubbish. Living on the Spanish Canary Islands, I don’t read the media much…

“and some other reasons” – You better tell me what they are, for so far you have NOTHING… 




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 airplane engines. When the ambient relative humidity is high, the resulting ice-crystal plume may last for several hours. The trail may be distorted by the winds, and sometimes it spreads outwards to form a layer of cirrus cloud.


Broken Contrails

from “Uncinus” of “Contrailscience”

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 constant amount of water, then why is the trail not constant? This puzzle is sometimes seized on by people who think that persistent contrails are actually “chemtrails”, or some kind of deliberate spraying operation.

But it’s actually very simple. The amount of water in the exhaust is pretty constant, but the amount of moisture in the air is not. The humidity varies with altitude in the stratosphere, and a layer of low humidity can be sandwiched between two layers of high humidity. As a plane climbs or descends through this layer, then the trail will only form in the areas of high humidity, and so look like it was “switched off” in the area of low humidity.

You can get the same effect with temperature. A warm layer of air can actually lay on top of a colder layer in what is called an “inversion” (you’ll hear this on the weather sometimes, referred to as an “inversion layer”). When a plane flies through this inversion layer, the trail can be “broken”.

It’s not just climbing or descending flights either. The boundaries between these layers is not flat, and gravity waves or rising convection currents of air can create large volumes of air that differ in temperature and/or humidity from the neighboring air, and so can break (or make) the contrail when the plane flies through them.

Don’t take my word for it though. Do a Google search for “broken contrail” and you’ll find lots of examples, and similar explanations.

NOAA – “Occasionally a jet plane, especially if ascending or descending, will pass through a much drier or more moist layer of atmosphere which may result in a broken pattern to the contrail, with it appearing in segments rather than in one continuous plume.”

AirSpace Magazine – “If the contrail stops, then starts up again, creating a broken line, chances are the airplane flew through a dry patch.”

Doc Weather – “What is happening here is that warm air rising from the ground carries vast amounts of water vapor upwards into the highest levels of the atmosphere. This water vapor exists as massive, plumes of warm, moist air ascending to very high levels. When a rising plume reaches the upper atmosphere it condenses into high ice clouds known as cirrus or feather clouds. In the case of the jet contrail (condensation trail) in the first image, the condensing cloud formed where the aircraft passed through a rising plume of moist warm air. The air on either side of the plume was not sufficiently moist to support the formation of an enduring cloud. As a result the contrail only remained visible in the warm plume.”


Now study the pictures above. The one on the left was entitled “broken contrail”, the one on the right “broken chemtrail”. If you know anything about analyzing computer jpg files, you will discover the one on the right to be FAKED (even though a telephone wire appears to pass through the “gap” in the “trail”.

Interesting, isn’t it? The “broken contrail” is honest, the “broken chemtrail” fake… 


Sniker, you don’t know the WHY so don’t tell me the HOW.

It’s a case of RELATIVE humidity and DEW POINT. HOT WATER VAPOUR, which is what “steam” is, can only MAKE UP the air’s humidity to its 100% RH level as it cools down. Beyond that it MUST form droplets of water or crystals of ice, depending on the air temperature.

In either case (troposphere or stratosphere) if the air doesn’t get to its 100% RH the water will evaporate or sublime into water vapour over a short period. Stratospheric air is MORE LIKELY to be saturated or supersaturated BECAUSE it is LAMINAR, whereas the troposphere is TURBULENT, being the BOUNDARY LAYER. Hence you sometimes get PERSISTENT TRAILS in the stratosphere.

Jets DO leave WATER contrails down below in humid 95%+ conditions where they occur (tropics mostly) but they are more difficult to see, and CT guys aren’t videoing there. There is a YT CT vid which clearly shows the APU (auxiliary power unit – all passenger planes have them) laying a faint trail (in Canada!), before it makes its stupid claim.

Clifford Carnicom forswore Science with his website. From his “USAF lies to America”, to his analysis (from the ground!) of a “chemtrail”, his site is a FARRAGO OF DECEIT. If you had ever made a study of LOGIC or ANALYSIS, you’d KNOW.

“just swipe your finger on random sufaces and hold up to sun and see the metal particals!” – You live in an INDUSTRIALIZED SOCIETY. You should expect CRAP in your air. Learn to spell. 


Sorry to disappoint. Here goes:

“antagonistic to empire/super-state comprising pentagon/blah/nasa, why do you think population culling is off the table” – because while it may be possible to blow away a president, and even easy to blow away a nonentity, it becomes very much harder to blow away the vast majority. Wars are a mess, and the only quick and final war would be a nuclear spasm. Poisons and diseases are slow, and have poor coverage. Logistically they are impossible. Practically they don’t work because people can move! Angry people (the ones you’ve missed!) become ferocious opponents. Ask the Germans about the Poles. Talk to Americans about the Vietnamese. To Israeli Jews about Palestinians. The Kurds about Iraqis.


“why not read history as if you were not immune to it” – I have done. It’s the only way to develop an immunity.

“you are a pawn” – I may have been a pawn, but no longer. If necessary I shall simply sail away. If anyone interferes with me I shall interfere with them.

“the industrial age drawing to a close” – Give me strength! There is more industry now than there has ever been. Knowledge hasn’t drawn to a close. Ability hasn’t drawn to a close. Necessity is the mother of invention. Take a look at the Afghans. The Pacific Ring…   …China…


“new game in the offing” – Yeah, yeah. Robots blah blah. There’s a great lawnmower and a great vacuum cleaner. Get out the Gray Goo, let’s off the peeps. You haven’t a clue.

“much fewer pawns” – stop reading science fiction and take a look outside. Out, not up! Sorry about the missing caps.


Written by JazzRoc

November 14, 2008 at 1:00 am

Posted in Aviation, chemtrails, contrails, science, Truth

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Science on Trails

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Don’t forget my other pages, links and comments are one click away at the top right of the page… 



USAF – “Contrails can remain visible for VERY LONG PERIODS OF TIME with the lifetime a function of the temperature, humidity, winds, and aircraft exhaust characteristics.”
WIKI – “Observation and scientific analysis of contrails, and their duration, date back to at least 1953.”
EPA – contrails can last for hours and GROW IN SIZE by taking water from the surrounding atmosphere. The trails spread due to “air turbulence created by the passage of other aircraft, differences in wind speed along the flight track, and possibly through effects of solar heating” – CSI (started by Carl Sagan and Isaac Asimov)
John Day, meteorologist – “Contrail formation, depends on the relative humidity of the atmosphere – the ratio of what is to what could be at a particular temperature. When relative humidity is low, contrails dissipate within seconds. But when relative humidity is high, especially at the subzero temperatures of the upper atmosphere, the addition of even a tiny amount of water vapor acts as a catalyst. Under these conditions, contrails may linger and spread to cover the whole sky. …At length, Day extracted from his bookshelf a well-thumbed edition of Peterson’s Field Guide to Clouds and Weather, which he co-authored in 1991 (a good 10 years before chemtrails became widely discussed), turned to the section on contrails, and pointed to a photograph of a thick, white plume–a plume that looked for all the world like a chemtrail…” – http://wweek.com/flatfiles/News1982.html
Patrick Minnis of NASA’s Langley Research Center *- “If you try to pin these people down and refute things, it’s, ‘Well, you’re just part of the conspiracy’ … Logic is not exactly a real selling point for most of them. The cloud-forming contrails that conspiracy theorists find so ominous are perfectly natural” – http://usatoday.com/usatonline/20010307/3117139s.htm


* Dr. Minnis’s career is outlined in “Penrod”: https://jazzroc.wordpress.com/2008/10/27/26-penrod/
NMSR Reports, Vol. 5, No. 12, December 1999 – “In summary, there is no evidence that these “chemtrails” are other than expected, normal contrails from jet aircraft that vary in their shapes, duration, and general presentation based on prevailing weather conditions. That is not to say that there could not be an occasional, purposeful experimental release of, say, high altitude barium for standard wind tracking experiments. There could also be other related experiments that occur from time-to-time which release agents into the atmosphere. However, not one single picture that was presented as evidence indicates other than normal contrail formation.”


“The variation in presentation is explained by the tropospheric conditions and, to some extent, the positioning of aircraft engines. When the troposphere experiences a relatively stable, supersaturated condition (water vapor in excess of 100% humidity without condensation), then any disturbance that causes formation of ice crystals provides nucleation surfaces for the supersaturated moisture to condense upon. When a jet engine burns its fuel, the major byproduct is water vapor. When the exhaust passes over the rear stabilizer of an aircraft, the tips or ends of the stabilizer cause the exhaust to expand rapidly. When it does, the temperature decreases rapidly within a turbulent flow, and ice crystal formation is forced.


Generally, this makes it look as if the jet were spraying a cloud from the ends of the stabilizer. If the atmosphere is not at saturation, the contrail will not persist. The formed ice crystals will sublimate into the surrounding atmosphere. Hence, the appearance of a short, well formed vapor trail. If the water content is very low, then no discernible contrail will form at all. All the exhaust water will be absorbed by the atmosphere before there is time to form ice crystals.
If the atmospheric water content is not consistent with altitude (picture atmospheric “waves” of high water vapor content below a layer of low water vapor content much like waves on the ocean), then a jet will alternately pass through air that allows contrail formation and air that does not.
This gives the appearance of a dashed line if the plane is flying at, or near the perpendicular to the waves. If the atmosphere is highly supersaturated, then the formed ice crystals may act as nucleation centers for a continual spreading of the contrail. In other words, the contrail actually causes the supersaturated moisture to condense, spreading out from its original path. This causes the formation of a cirrostratus cloud structure, far in excess of what would occur from a simple contrail.”


One other phenomenon observed is the formation of contrails off wing surfaces along with the engine exhaust contrails. This can be caused when the air is highly supersaturated and the expansion of the air coming off of the wing surface is sufficient to cause ice crystallization. In this case, it appears that the whole plane is leaving a trail. This can often be observed by a passenger flying in a commercial airplane when entering cold, supersaturated air, particularly in the winter when close to a storm front.”
M. Kim Johnson, Physicist – “There were no pictures or evidence that indicated anything other than the above contrail formation phenomena. Anecdotal stories of persons getting sick after contrails from obviously supersaturated tropospheric conditions lend no basis for belief that there are chemicals or biological agents being released. This type of story provides as much credence to “chemtrails” as does the belief that drinking milk is causally linked to heroin addiction. (Almost all heroin addicts in the US drank milk as children.)”



“those in power crimes against humanity” – Those in power normally commit their crimes against anyone who threatens them – closest first.

“google these” – Done that, have t-shirt.

“I get ill, I feel nauseous and get disoriented from them” – Illness, nausea and disorientation are more often the consequences of the western diet and stress levels.

“UFO’s hovering close proximity to trails” – are more likely to be PLASTIC BAGS borne aloft. You don’t see’em elsewhere because you’re ONLY looking for trails.

“Los Angeles defiantly purposeful” – Isn’t one of the LARGEST AIRPORTS IN THE WORLD (LAX) NEARBY?

“turn off/on same paths” – Contrails through layers of differing humidities.

“above and in clouds” – Where clouds are there is MORE WATER.

“clouds dissipate/spread out/NO RAIN” – Stratospheric clouds will go OVER THE HORIZON before they have fallen and warmed sufficiently to cause rain.


“dissipate/fall to earth/city/fog” – SEA MIST, AUTO SMOG. I’VE BEEN THERE TOO.

“watching for years now” – YEAH, ME TOO.

“Other jets fly close in altitude and areas, with rapidly dissipating trails” – You are SEVEN MILES BENEATH and are UNABLE TO DISTINGUISH INVISIBLE STRATOSPHERIC LAYERS WITH DIFFERING HUMIDITIES FROM BENEATH.

“(other) trails spread into a web covering the entire sky from an operation” – ARE THE CONSEQUENCE OF NORMAL PASSENGER SHUTTLE ROUTES AT ANGLES TO EACH OTHER.

“Jets should not be making turns” – YOU CANNOT BE SERIOUS.



“Go ahead and post your theories” – this is known science as in http://www.contrailscience.com

“if you really are a government plant, go suck a chemtrail” – No. I’m an educated Welshman who despises charlatans.

“We would still think the world was flat if we listened to your method of reasoning” – so you’re plainly anti-science, then?

“Everyone SHOULD be questioning and exploring what’s going on (unless of course you have an agenda to obfuscate the truth!)” – then how come you haven’t managed to find a good science textbook?

“It’s counter productive to denounce people’s ideas on the basis that you (condescendingly I might add) believe they are unsure or uneducated” – There’s ABSOLUTELY NO DOUBT IN MY MIND that you are EITHER uneducated OR evil. More likely uneducated, yet literate enough to indulge yourself in sophistry. There’s NOTHING productive about your pseudo-science.

“In my mind there has not yet been a convincing explanation as to what the Chemtrails are” – so you’re plainly anti-science, then?

“you are suggesting that it is evil to explore any theory unless you are sure it’s true” – I am suggesting that it is EVIL to PROMULGATE any theory unless you are SURE it’s true. Your MISDIRECTION?

“You are also implying that since you are sure of your explanation” – IT’S IN ANY SCIENCE TEXTBOOK COVERING THE ATMOSPHERE.

“everyone else’s is wrong and evil” – No, let’s be particular. YOURS is wrong and evil.

“That reasoning goes against the advancement of science and progress” – YOUR reasoning goes against the advancement of science and progress.




 “what you’re made of” – Hi, SKYWITLESS, here you are arguing with me on someone else’s site. You can’t do that on your own site because YOU HAVE BLOCKED ME. You appear to be made of hypocrisy.

“trails” APPEAR TO BE “turned on and off” because THE PLANE FLIES “through layers of differing humidities” – Were you to attempt to PROPERLY UNDERSTAND THE ATMOSPHERE, you would soon see that that way the stratospheric layers slide over each other without intermixing GUARANTEES that they will posses DIFFERENT HUMIDITIES AND TEMPERATURES. A CLUE – sometimes the boundaries between layers ARE turbulent, and you will SEE CIRRUS APPEAR. Best done when sunning yourself on a beach.

“Show us one video that supports” – NO VIDEO! TRY READING!


“NWO forces cannot control the free-will of people” – YOU ARE PRAYING.

“They are scared to death of the people becoming united in one mindset and purpose” – YOU ARE CHANTING.

“A people like this can defeat the NWO forces” – YOU ARE INTONING.

“This is why they send people like jazzroc to make noise and try and sow confusion” – AND NOW YOU ARE LYING.

“but just laugh at people like jazzroc and send them on their way” – Yes, tell others not to think. Liar. Hypocrite. Coward.



Hi ludosophist, as you know anyone can say anything about chemtrails; however video evidence of jets spraying chemtrails is much stronger than the words of anyone who says that chemtrails don’t exist. If you don’t believe that chemtrails are being sprayed, then how do you explain the numerous videos which show them being turned on and off? Do you also agree with Jazzroc’s explanation of how this happens? If you don’t want to call them chemtrails, then what do you want to call them?

They key here is rational weighing of evidence. The off/on thing is the only loose end Jazz didn’t tackle, or maybe I skipped that part accidentally.

(He did.)
If you could zoom in to a nozzle device, and actually show that, it would be evidence. Personally, considering the history of nasty shit the government has done (assasinations, depleted uranium, etc.) I don’t rule it out, but after learning more about relative humidity distribution I have to weight that they’re more likely contrails.
Perhaps one day I will be able to zoom in and capture the spray nozzles. At this time however, I have numerous videos showing jets turning the chemtrail spray on and off. Take a look at the videos and tell me if you still think the on/off action is a result of relative humidity distribution. If you still think that these are normal contrails can you find any reputable books that explain how contrails can do such a thing?

Here’s my rationale:
1) It’s plausible, there is an evil oligarchy with a lot of power that does stuff like this on smaller scales.
2) It maybe not be possible because you can’t burn barium into an aerosol.
3) P(god exists) < P(Chemtrails) < P(Bin Ladin Dead)
4) Argentina has few of these trails to speak of because there is little commercial airflight and no active airforce. Or, the NWO wants to reserve it for recreation. Either way, I’m moving there.
5) Hyper-inflation, food shortages.

Skywitness, if you just video the sun rising in the East, and setting in the West (assuming that “chemtrails” allow you to do this) you will do two NEAT things:
1) You will PROVE that the Sun goes round the Earth.
2) You will BURN out your camera chip, and give us ALL a break…
Your talk is cheap…Provide a science book that explains how a jet trail coming from a jet already in flight can go on and off. You said: “trails” APPEAR TO BE “turned on and off” because THE PLANE FLIES “through layers of differing humidities” – Were you to attempt to PROPERLY UNDERSTAND THE ATMOSPHERE, you would soon see that that way the stratospheric layers slide over each other without intermixing” Where’s the science book that backs up your claim? Put up or shut up.

CHECK WIKI. STRATOSPHERE. There’s enough in that page for one to infer what I’ve told you. Work it out for yourself. I’ll be damned if I’ll lead you by the hand through the ONE PAGE after you have slandered me for six months. Perhaps your physics is too miserable to cope.. should I care? Alternatively: jazzroc.wordpress.com
CHECKMATE!!! The self-proclaimed 63 year old scientist, who when asked to provide a science book to back up his scientific claims about why a contrail appears to go on and off, can’t do it. The bottomline is you can’t do it because there is no science that backs up your bogus claim. Your defeated in the open field…Surrender your sword. Do the right thing now and tell ludosophist and the rest of the world why you have chosen to lie continously about the ongoing chemtrail spray program.

Mr. sophisticated game-player, I like your vid so much that I bunged it in my video log. Thanks very much! I DID cover off/on, several times and rather thoroughly. I also uncovered a “chemtrailer” airbrushing one into existence… and it’s a popular picture quoted in several vids…
AS WIKI (ON THE PAGE I INDICATED) SAYS: “It is stratified in temperature, with warmer layers higher up and cooler layers farther down, which makes the stratosphere dynamically stable”
THAT PAGE GOES ON TO SAY: “horizontal mixing of gases components proceeds much more rapidly than vertical mixing” – WHICH IS ANOTHER WAY OF SAYING THAT THE LAYERS WILL NATURALLY BE OF VARYING HUMIDITIES, BECAUSE THEY RECEIVE THEIR WATER FROM THEIR SIDES AND NOT FROM ABOVE OR BELOW. THEY ARE “HUMIDIFIED” MAINLY BY A PHENOMENON CALLED “QUASI-BIENNIAL OSCILLATION”. “The QBO induces a secondary circulation that is important for the global stratospheric transport of tracers such as ozone or water vapor”.
“bottomline is you can’t do it” WHOOPS “because there is no science that backs up your bogus claim” AND “You’re defeated in the open field…Surrender your sword.” AND “you have chosen to lie continously about the ongoing chemtrail spray program” ARE THUS THE WORDS OF A STUPID SLANDEROUS IDLE LAYABOUT WHO THINKS THAT OTHERS ARE AS LAZY AS HE IS, LACKING AS HE DOES THE IQ TO UNDERSTAND WHEN HE’S BEATEN (ONCE AGAIN).