This spot has completely ordinary weather patterns and clear skies. Now it has a pleasant amount of rain. Now the pleasant amount of rain is growing into an unpleasant amount of rain. Now the giant raging thunderstorm is eating all of the other rainclouds on the planet - not directly and overtly sucking them in, but growing larger and larger while they wither and shrink. Now there is a horrible drought everywhere else, while this area floods catastrophically.