Scientists employed by Sheikh Khalifa bin Zayed Al Nahyan, president of the UAE and leader of Abu Dhabi, successfully created more than 50 rainstorms in the state's Al Ain region last year, mostly in July and August when there is virtually no rain at all. It is believed to be the first time the system has produced rain from clear skies.
They have been using giant ionisers, shaped like giant lampshades, to generate fields of negatively charged particles, which create cloud formation.
In a company video, seen by The Sunday Times, Helmut Fluhrer, the founder of Metro Systems International, the Swiss company in charge of the project, said: "We are currently operating our innovative rainfall enhancement technology, Weathertec, in the region of Al Ain in Abu Dhabid. We started in June 2010 and have achieved a number of rainfalls."
http://www.telegraph.co.uk/news/worldnews/middleeast/unitedarabemirates/8236350/Abu-Dhabi-weather-project-creates-man-made-rainstorms.html