Which natural event periodically weakens western surface ocean currents in the equatorial pacific ocean, resulting in a change in air temperature and precipitation patterns in the united states?

El Niño is a natural event that periodically weakens the western surface of ocean currents in the equatorial pacific ocean. In an El Niño, the wind that pushes water around (which keeps the east warm and west cold) gets weaker making the ocean warmer, changing the air temperature and precipitation patterns in the United States.