Heavy rains in Saudi Arabia !

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I read a news clipping last week reporting about heavy rains in Saudia Arabia. Many streets were flooded in Jeddah and some buildings also came down. Saudi Arabia being a desert, hardly experiences rains. As far as I know, there will be drizzle only, once in about 3 years. But, has this unusual heavy rains got to do something with global warming or any other ecological imbalance created by Man or Nature? What do you say?