What are El Niño and La Niña? | Into the Driver's Seat | Scoop.it
From oceanservice.noaa.gov - March 3, 2017 11:44 AM

"El Niño and La Niña are complex weather patterns resulting from variations in ocean temperatures in the Equatorial Pacific--officially known as the El Niño-Southern Oscillation (ENSO) cycle. These deviations from normal surface temperatures can have large-scale impacts not only on ocean processes, but also on global weather and climate."