1) Short-lived, non-persistent contrail (SLNPC),
2) Persistent contrail, non-spreading (PCNS) ,
3) Persistent contrail, spreading (PCS)
We want to know under what conditions – and how often we can expect to see different manifestations of persistent contrails – whether it’s the non-spreading or spreading type.
The data available from various weather sonde systems sharply contradicts NASA’s claim that persistent contrails are a common atmospheric response to jet aircraft emissions.
The U. Wyoming is one source that aggregates atmospheric conditions collected at many sites around the US, Europe and beyond. The data above 26,000 feet reveals that conditions for formation of of so-called “persistent contrails” due to high relative humidity above 70% is “rare”.
NASA defines PCNS as a seperate species of artificial cloud from the PCS type. NASA also avoids concluding that a PCS is necessarily evolved from a PCNS. It is, therefore possible that a PSC can either be evolved from a PCNS or appear spontaneously as a “spreading” PCS emission without ever being defined as a PCNS.
NASA Published a study in 1994:
“NASA scientists have found that cirrus clouds, formed by contrails from aircraft engine exhaust, are capable of increasing average surface temperatures enough to account for a warming trend in the United States that occurred between 1975 and 1994.”
This disturbing acknowledgement of two decades of secret atmospheric heating on a planetary scale demands immediate investigation in light of conclusive evidence in the Case Orange Report for the existence of a secret jet aerosol geoengineering program that has been carried out globally under direction of the US government for nearly 20 years.
The work of investigator, Cliff Carnicom originally exposed the obfuscation imposed by federal agencies on the subject of contrails vs. persistent contrails vs. persistent spreading contrails.
A knowledge of conditions required for formation of persistent contrails above 26,000 feet is inexpensive and sitings can be fact-checked against available atmospheric data in many instances. Although this method does not reveal the content of the presumed geoengineering compound it serves well as a repeatable test to validate the occurrence of a jet aircraft emission of unknown composition and toxicity.
Using NASA’s own data it can be asserted with confidence that a persistent jet trail that remains visible for more than 10 minutes is not primarily water vapor and is far more likely to fit the Oxford dictionary definition of “chemtrail”.
Contrail Science B: Calculating probability of water vapor contrail formation with respect to relative humidity at flight level HERE
Contrail Science C: How to estimate the expected distance of a water vapor contrail from the jet engine during flight. HERE