Skip Navigation Links 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
Climate Prediction Center

Expert Assessments
   ENSO Diagnostic
     Discussion Archive

About Us
   Our Mission
   Who We Are

Contact Us
   CPC Information
   CPC Web Team

HOME > Expert Assessments > ENSO Diagnostic Discussion
issued by
and the International Research Institute for Climate and Society
5 December 2013

ENSO Alert System Status: Not Active


Synopsis: ENSO-neutral is expected to continue into the Northern Hemisphere summer 2014.

During November, ENSO-neutral persisted, as reflected by near-average sea surface temperatures (SST) across much of the equatorial Pacific Ocean (Fig. 1). SST anomalies in all of the Niņo regions were small, but showed increases in the Niño-3.4 and Niño-4 regions (Fig. 2). The oceanic heat content (average temperature in the upper 300m of the ocean) increased (Fig. 3) due to the eastward propagation of a downwelling oceanic Kelvin wave. This increased heat content reflects above-average subsurface temperatures across the Pacific (Fig. 4). The wind anomalies remained small at lower and upper levels during the month. Equatorial convection was suppressed in the central equatorial Pacific and enhanced over Indonesia (Fig. 5). Collectively, these atmospheric and oceanic conditions reflect ENSO-neutral.

The majority of model forecasts indicate that ENSO-neutral (Niño-3.4 index between -0.5oC and 0.5oC) will persist into the Northern Hemisphere summer 2014 (Fig. 6). While current forecast probabilities are still greatest for ENSO-neutral by mid-summer, there is an increasing chance for the development of El Niño. The consensus forecast is for ENSO-neutral to continue into the Northern Hemisphere summer 2014 (see CPC/IRI consensus forecast).

This discussion is a consolidated effort of the National Oceanic and Atmospheric Administration (NOAA), NOAA's National Weather Service, and their funded institutions. Oceanic and atmospheric conditions are updated weekly on the Climate Prediction Center web site (El Niño/La Niña Current Conditions and Expert Discussions). Forecasts for the evolution of El Niño/La Niña are updated monthly in the Forecast Forum section of CPC's Climate Diagnostics Bulletin. The next ENSO Diagnostics Discussion is scheduled for 9 January 2014. To receive an e-mail notification when the monthly ENSO Diagnostic Discussions are released, please send an e-mail message to:

Climate Prediction Center
National Centers for Environmental Prediction
NOAA/National Weather Service
College Park, MD 20740

NOAA/ National Weather Service
National Centers for Environmental Prediction
Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
Page Author: Climate Prediction Center Internet Team
Page last modified: December 5, 2013
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities