This is an interesting article. It claims that scientists in Abu Dhabi have found a way to create rainstorms in the desert. According to the article scientists employed by the ruler of Abu Dhabi have managed to create as many as 50 rainstorms using technology. They use giant ionisers to generate fields of negatively charged particles. These promote cloud formation and can then produce rain. It is thought this is the first time that a system has been able to produce rain from clear skies.