persistent contrails

How long can a persistent spreading contrail last? Can there be a contrail shadow with a spreading contrail?

Here is my journey through France. Dijon / Lyon / Metz. This was on 18th of May 2015. Here is the exact route...

Hi Metabunkers, In regards to persistent spreading contrails. I understand that different contrails ie: short, persistent, persistent and spreading contrails require different environmental conditions to exist. I've been observing planes leaving persistent spreading contrails at altitudes...

I will show, that 2 central satements on Chemtrails are not likely to be true on the same time by analysing scientific data on 506 contrails in Alaska Fairbanks. http://akclimate.org/sites/default/files//papers/Wendler2005.pdf Common Chemtrail Believer Statements: 1)Chemtrails (long lasting...

Global March Against Chemtrails and Geoengineering makes the following claim on their facebook page: https://www.facebook.com/GlobalMarchAgainstChemtrailsAndGeoengineering/photos/a.229167253958400.1073741888.120482964826830/271465206395271/?type=1&theater (https://archive.today/fZ2G1) Global...

A very busy-looking sky this morning over Hampshire, UK (July 30 2014).

One problem I have in telling people that contrails can actually persist, and can even spread out to cover the sky, is that people tend to be suspicious of random people on the internet. So I decided to simply let 70 years of books on clouds speak for themselves. Result: Every single book on...