Today is World Meteorological Day and this year's theme is "understanding clouds", highlighting the enormous importance of clouds on climate and water. The World Meteorological Organization says clouds play a pivotal role in weather forecasts and warnings. They help to drive the water cycle and the entire climate system. Throughout history, they have inspired artists, poets, musicians, photographers and countless other enthusiasts. Let's check out some spectacular cloud formations and fog images around the world in different climate circumstances.

Towering skyscrapers emerge from a blanket of fog and cloud in Dubai, United Arab Emirates, in March 2014. [Photo/VCG]