If clouds can't form, then it will not rain. Winter storms and tropical storms now readily invade the coast causing abnormal amounts of rain. The name refers to the Christ Child of the Christian faith. This allows the colder subsurface waters that are rich with nutrients to move to the surface. The nutrients, now at the surface, stimulate the growth of phytoplankton.
Little fish eat the phytoplankton, big fish eat the little fish, and so on.
Since there are less phytoplankton, there will be less little fish, and less big fish. Convection and rainfall results from delivery of moisture and heat to the atmosphere there. El Ni o condition in the equatorial Pacific. The warm pool has lost water, which moves east, taking the convection center with it. Trade winds are weak, and upwelling off Ecuador and Peru ceases.