Apatch of ground in direct sunlight will have a patch of ground shaded by clouds.

A patch of ground in direct sunlight will have a lower air pressure than a patch of ground shaded by clouds. It causes lower air pressure because as we move away from the surface amount of air will become less.Then Such changes could incorporate any of the different sorts of frosty front circumstances, storms or creating and propelling troughs of low weight, typically with going before cloud masses.