Monday, February 10, 2014

Persistent Contrails have existed for 70+ years


The science behind how and why contrails form, persistent, and spread out, have been documented and observed consistently throughout the history of aviation.  The effects of contrails has changed throughout recent years because of engine technology, as high bypass jet engines creates cooler exhaust which is more likely to condense before it mixes with the surrounding air. The size and efficiency of engines are more conducive to big and impressive looking contrails. Combine that with the incredible amount of air traffic in the skies today, and the right atmospheric conditions, it's no wonder why lots of persistent contrails form in the skies daily.

Chemtrail believers claim that persistent contrails are a new thing, they call them chemtrails and claim that contrails don't last a long time, and they certainly don't spread out and cause cirrus clouds and overcast skies. They also claim that these persistent contrails started in the late 1990s.


Ask yourself, Is there a  physical or visible difference between chemtrails and persistent contrails?


Three good videos to start out with follows: *Must Watch!*





Here is a video of someones Popular Science Magazine, May 1969

(below is a crop of the section, from page 76, and the transcript)




Page 76, (isolated)


















  





Transcript"The reflectivity of the earth is also altered by jet contrails, say Dr. Walter Orr Roberts, director of the National Center for Atmospheric Research.

Contrails, Dr. Roberts explains, do not simply spread out at the 30-40,000-foot altitudes where jets fly, but spawn cirrus clouds by seeding the upper atmosphere with ice crystals from the water vapor in jet exhaust. On a clear day, you can often see this happening near heavily traveled airways.

"It is almost certain that on many occasions - 30 to 40 days a year, say - the cause of cirrus cloud cover can take in a substantial part of a continent, perhaps half of the U.S., and has a substantial influence on our radiation budget"



A very good video showing real world examples of Contrail
formations as well how "Grid" patterns form.




*CLICK* on the Articles, Pictures, and Videos to expand 
OR *ZOOM IN* using your web browser:


Aircraft Contrails Factsheet
























































































KCRA 3 WeatherPlus meteorologist Dirk Verdoorn
discusses contrails formed by jets





Skip to 1:00 on the video below.
Scott explains why contrails linger, and their association 
with frontal systems, causing them to persist.




This video explains how impossible it would be for aircraft
to contain the incredible amout of chemicals needed for the
amount of spraying people claim is going on. And why spraying
at high altitude is counter productive.
 




Here is a 9 year old video, it shows the incredible amount 
of air traffic over the USA. As you can see the likely event 
that aircraft routes intersect and create these "grids"
on days where the atmospheric conditions are right, is
very much a guaranteed occurrence.




A HIGH ALTITUDE MAP SHOWING THE COMMON 
FLIGHT PATHS OVER THE USA
















A HIGH ALTITUDE MAP SHOWING THE COMMON 
FLIGHT PATHS OVER EUROPE 

















PERSISTENT CONTRAILS THROUGHOUT HISTORY 


Exploring The Sky By Day - Terence Dickinson 1988
States that "Contrails can last for hours"


























Washington Post; reprinted in The Gazette, of Eastern Iowa 
Dec 26 1980








































Kingsport Times, Tennessee, Feb 11 1954














 San Mateo Times, Jan 12 1950
 




















Waterloo Courier, April 16 1950



A page from a 1972 book titled "Clouds of the world"
(This was used in the first video)
























https://plus.google.com/photos/107393796095434664991/albums/5363662113705530081/5363662635512318290?banner=pwa&pid=5363662635512318290&oid=107393796095434664991


1969 book titled "Clouds and Weather"
(Showing persistent and spreading contrails)

























1969 Spreading Contrails

























Cloud Study A Pictorial Guide 1957
(This was used in the first video)

























A Color Guide To Clouds 1963
(This was used in the first video)



















Arcadia Tribune, April 29 1970

























Transcript "Aircraft contrails begin to streak the normally bright Arizona sky at dawn. Through the day, as air traffic peaks, these contrails gradually merge into and almost solid interlaced sheet of cirrus cloud – an artificial cirrus cloud that is frequently as much as 500 meters deep"


The News Frederick MD, March 7 1944
























Transcript Top right - “Contrails frequently have a tendency to cause a complete overcast and cause rain. In Idaho I have seen contrails formed in a perfectly clear sky and four hours later a complete overcast resulted

Bottom left - "Contrails are a headache to combat pilots and are very difficult to control
Apparently they result only when the atmosphere is at a certain temperature and humidity."


Spokane Daily Chronicle July 7 1955


















Transcript "An extremely persistent contrail might stay in the sky all day"


 Contrails over the World Trade Center 1994















http://www.flickr.com/photos/thierry62/3429012926


Twin Towers June 17 1985
























 http://www.flickr.com/photos/bobmendo/19989783/


Contrails over Arizona 1989














http://www.flickr.com/photos/jlovely/1510717498/


Contrails over Oregon 1990
















http://www.flickr.com/photos/markdint/3470370301/lightbox/


1977



















http://www.flickr.com/photos/30159472@N04/5715276757/


Grand Rapids, Michigan 1964
 























http://www.flickr.com/photos/13717226@N00/6819996357/


February 1988


















http://www.flickr.com/photos/brugge62/83381681/


 Plattsburgh NY 1988


















http://www.flickr.com/photos/evanrapp/319068324/


Lake Norman NC, January 1983





















South Dakota 1972

















http://www.flickr.com/photos/dboo/5135914115/


January 9 1970

















http://www.flickr.com/photos/mofotolab/52144900/in/photostream/


Yellowstone July 1985
























http://www.flickr.com/photos/saruchan/3700208972/


Lake Leman Switzerland 1978























Center Island Toronto August 23 1980
























http://www.flickr.com/photos/mcwidi_2/3593191977/


Spreading Contrails, Paris September 1989
























http://www.flickr.com/photos/grissongs02/2837711801/


Preston, Lancashire, UK 1981















Las Vegas 1989

















http://www.flickr.com/photos/canadagood/3068353370/


Rat Patrol TV Show February 20 1967



















https://www.youtube.com/watch?v=3URrYnZS_Tw


Colorado December 6 1989

























 U.K August 1944






















"Messegelände" (Exhibition ground) Frankfurt/Main 1987

























Persistent Contrails  1958














http://www.airliners.net/photo/0094277/L/


WWII Contrails 1944




















http://images.google.com/hosted/life/ff756c4c69c54510.html


Contrails in 1953 and 1950 Nucear Test Films

 






Bomber Contrails 1944

















B-24 Liberator Planes 1943-45

















Fighter Planes Contrails 1941




1980 News report on Contrails




Douglas DC 8-62 leaving contrails 1982



















Air Force Promo 1950









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