National Oceanic and Atmospheric Administration (NOAA)
The NOAA El Niño and La Niña Portal provides current status, explanatory links, progression and impacts of ENSO at the United State and Global scale.
El Niño and La Niña are the warm and cool phases of a recurring climate pattern across the tropical Pacific—the El Niño-Southern Oscillation, or “ENSO” for short. The pattern can shift back and forth irregularly every two to seven years, and each phase triggers predictable disruptions of temperature, precipitation, and winds. These changes disrupt the large-scale air movements in the tropics, triggering a cascade of global side effects.