First of all. It's spelled weather. We can do a lot more with weather now than ever before. Now we have the ability to change the weather to certain degree's through a process called Cloud Seeding. We can reduce or even increase the amount of rain by up to 10% annually. Imagine that. Changing the weather. Creating draughts or even eliminating it. There has been speculation that cloud seeding programs may have had an effect on events as big as hurricane Katrina. So as to whether we can predict extreme weather the answer is a resounding YES. Although doing it with pinpoint accuracy seems to be a little more difficult.