El Niño Southern Oscillation (ENSO)

ENSO Response Comparison Plots

Composite (average) atmospheric variables associated with 9 El Niño and 9 La Niña events from 1948 to the present. Events are defined for winter(Nov-Mar) and summer (May-Sep). Anomalies are defined as the difference from the 1981-2010 means (1971-2000 for the climate division data). Options are available for comparing El Niño to La Niña, anomalies to means and winter to summer. Set your browser window as wide as possible to view plots side-by-side.

The composites are based on historic events and should not be construed to represent a seasonal mean forecast. Events vary in their impacts, as the strength, geographic extent, and seasonality of particular events vary. There are different time scales that may act differently. Finally, other climate and weather processes and "noise" may make the impacts of one event different than another. Some events may be associated with very extreme climate conditions which may dominate the composites. Users can explore some of these issues with the links below. The current NOAA official seasonal forecast is available from NOAA/CPC. They also make available an ENSO diagnostic discussion.

Create a Plot

Output Form
  Single Plot
  El Niño vs. La Niña
  Anomaly vs Mean
  Summer vs Winter
Variable
  Surface Air Temperature
  Sea Level Pressure
  Climate Division Temperature
  Climate Division Precipitation
  Surface Zonal Wind
  Surface Meridional Wind
  Precipitation Rate
  200mb Zonal Wind
  500mb Geopotential Height
  700mb Omega
  SST
Region
  Globe   USA
Event
  El Niño   La Niña
Season
  Winter   Summer
type
  Anomaly   Mean

Years That Define Events

Winter Summer

El Niño

La Niña

1982-831954-55
1991-921955-56
1997-981970-71
1957-581973-74
1986-871975-76
1972-731988-89
1965-661998-99
1968-691964-65
2002-031999-00

El Niño

La Niña

19651950
19721955
19821956
19871964
19911971
19931974
19941988
19971999
20021998

Related Information and Resources

This is a Research and Development Application