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El Niño / Southern Oscillation (ENSO)

National Oceanic and Atmospheric Administration

National Climatic Data Center

CPC: La Niña has transitioned to ENSO-neutral conditions, which are expected to continue through northern summer 2012.

Current global SST anomaly

El Niño and the Southern Oscillation, also known as ENSO is a periodic fluctuation (i.e., every 2–7 years) in sea surface temperature (El Niño) and the air pressure of the overlying atmosphere (Southern Oscillation) across the equatorial Pacific Ocean.  The presence of an El Niño, or its opposite – La Niña – sufficiently modifies the general flow of the atmosphere to affect normal weather conditions in many parts of the world. Learn More...

Questions?

For all climate questions, please contact the National Climatic Data Center's Climate Services and Monitoring Division:

Climate Services and Monitoring Division
NOAA/National Climatic Data center
151 Patton Avenue
Asheville, NC 28801-5001
fax: +1-828-271-4876
phone: +1-828-271-4800
email: ncdc.info@noaa.gov
To request climate data, please E-mail:ncdc.orders@noaa.gov