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If a mass of barium is vaporized in space, within seconds much of the barium becomes ionized by the suns rays, producing a highly reflective ionic cloud which deflects newly arriving solar energy back into space, thereby preventing the ground from warming to the temperature it otherwise would have attained.
Cooler-than-otherwise surface temperature means the air immediately above the ground will not heat as much as it would have, not expand and rise (evacuate upwards) as it would have, and not create the lower air pressure (relative vacuum) in that location that would have obtained otherwise. In short, laying cloud causes air pressure to be higher in regions where the sun has been prevented from reaching the ground.
Oversimplifying somewhat, it means that there will be less "pull" and more "push" affecting movement of air in neighboring regions of near-surface air than otherwise; and that, of course, means control of the weather. By using this push-pull ("high-pressure-block/low-pressure-suck") technique, the movement of neighboring parcels of air -- the parcels may be wet, dry, hot or cold, or rotating (cyclonic) -- can be redirected from the course that a super-high-speed computer pre-determined they would have taken to new courses calculated during the process.
The calculations take into account (plug into the set of simultaneous equations that comprise the model) all of the variables (interacting factors) fed in real time from sensors collecting data from thousands of points in land, sea air and space. The planes laying reflective cloud change their course seveal times in the middle of a run as new computations dictate the latest requirements in the weather intervention to effect the desired result.
It is impossible to predict weather more than two or so weeks in advance, because of the errors that creep in each time you multiply a number shortened in the decimal places (man is limited in his data measurements to only so many decimal places and each time different measures are multiplied accuracy is lost, the prediction becomes accurate to fewer and fewer "significant figures."