According to Scott Stevens', an award-winning TV weatherman who runs the website Weatherwars.Info, evidence shows that (some) chemtrails are being used  for use with the scalar weather modification technology Lt Col. Tom Bearden has written and spoken about .
The following was at the Coast to Coast AM website:http://www.coasttocoastam.com/show/2010/08/19
Several years ago, [Scott Stevens] set up time lapse cameras to record the skies and study chemtrails, and learned that planes were up there measuring the geometry to entrain the jet stream or the flow of air. The secretive "powers that be" can measure the orgone, and apply electromagnetic solutions to change the weather and storm patterns, he detailed. "There's got to be a playbook they're working from-- so when we see these disasters like the fires in Russia and the flooding in Pakistan...this was something that they talked about weeks to months prior," he stated.
Scientists like Trevor James Constable gave them the playbook on how to manipulate the orgone or etheric energy back in the 1970's, and this knowledge has been misused, said Stevens. Project HAARP is probably used in less than 20% of the weather modification efforts-- "I'm honestly more concerned about...orbiting military satellites that have directed energy technologies on them," he noted.
The interview Scott Stevens had with George Noory on Aug the 19th, 2010 was posted at YouTube. It starts in the third minute in the video at the link here: MUST HEAR
 Scott Stevens On Red Ice Radio- Weather Wars, Chemtrails, Gulf Oil Spill & Environmental Destruction July
2010 (1 hour)http://www.redicecreations.com/radio/2010/07jul/RIR-100701.phpOur weather is being controlled - but by whom?
By Scott Stevenshttp://portland.indymedia.org/en/2005/01/309572.shtmlScott Stevens website: http://www.weatherwars.info/
Note: Bearden refers to the Russians as being behind it, but as Scott Stevens has pointed out, the planes involved in spraying chemtrails in association with the scalar weapons evident in the US, belonged to the US military, (not the Russian military).
. The Tom Bearden Websitehttp://www.cheniere.org/books/ferdelance/intro.htm
. Lt. Col. Tom Bearden: Weather Modification & Energy Weapons ! The Science Behind It!http://socioecohistory.wordpress.com/2010/01/23/lt-col-tom-bearden-weather-modification-energy-weapons-the-science-behind-it/
Look for gridding and wave formations in the skies, which are characteristics of scalar's use. The waves, (which can be seen in several different forms at one time), Bearden depicts in the talk posted below as being in the interface zone for scalar wave transmitters.
Thomas Bearden's diagram of longitudinal wave interference
Below is a picture of a grid pattern, an indicator scalar technology is being used Bearden claims, that was taken by someone he knows and shown during the talk I have posted above.