El Niño & La Niña (El Niño-Southern Oscillation)


ENSO-neutral and El Niño are nearly equally favored during the Northern Hemisphere summer and fall 2017.

More ENSO status information
Latest official ENSO update
Latest ENSO blog update
ENSO Monitoring at the Climate Prediction Center


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.

More about El Niño
What is El Niño in a nutshell?
Understanding El Niño (video)
ENSO alert system criteria
ENSO essentials
Educational Resources on ENSO

By modifying the Pacific jet streams, El Niño can affect seasonal temperature and precipitation across the United States, mostly in the winter. 

This map shows typical impacts of El Niñ on U.S. winter weather. These impacts have been associated with El Niño events in the past, but “associated with” doesn’t mean that all of these impacts happen during every El Niño episode. 

Typical U.S El Niño impacts
Winter temperature and precipitation
Hurricane season impacts
Coral Bleaching

Current outlooks
6-10 day outlook
8-14 day outlook
1-month outlook
3-month outlook

El Niño and La Niña have their strongest impact on global climate during the Northern Hemisphere winter & early spring. The map at left shows typical December-February global rainfall and temperature patterns during El Niño. However, it's important to remember that we may not see all impacts during every event. NOAA Climate.gov map.

More information
ENSO's cascade of global impacts
The Walker Circulation
Maps of global impacts of La Niña and El Niño

May 2017 ENSO update: Mayday

May 11, 2017

The chance of El Niño conditions and the chance of neutral are both just shy of 50%. Unlike two years ago, when the signal that a strong El Niño was developing was clear, most of our prediction tools are suggesting very borderline conditions, making it a tough forecast.


Regional & Local Impacts

Events & Announcements

NOAA National Weather Service Daily Briefing
Briefing page with forecasts, discussions, maps, assessments, and severe weather outlooks for today’s developing weather patterns across the United States.

El Nino: What's Next?
February 18, 11 am CT
Hosted by SCIPP

NOAA Monthly Climate Briefing for Media
Thursday, February 18, at 11 am EST
Teleconference for public media on past month’s weather & climate conditions for the U.S. & globe, an update on El Niño, and NOAA’s 3-month climate outlook.

Western Region
California Winter Status Update
January 26, 4 - 6 pm EST