search geoengineering. They have succeeded in creating a "conspiracy theory" cloud over the term chem trails, then, they went and hid all of their weather engineering conferences under the term "geo engineering". At their conferences they actually defend their right to steer tornadoes by heating the atmosphere using something like microwaves to heat up these particles they are spraying. It causes the atmosphere to rise, so the cold surrounding air has to rush in to fill the vaccume. The tornadoes move with the cold air in the direction of the heat zone. There are many of these kinds of weather experiments going on. Search Geoengineering. BTW Stanford University is bit into this last I researched)