The 1997 El Nino seen by TOPEX/Poseidon. Source NASA

Tropical Pacific (Niño region) sea-surface temperature forecasts

Climate centres use several standard regional averages of sea surface temperature anomalies as indices to monitor the state of the tropical oceans.

View Tropical Pacific sea surface temperature forecasts.

For each of several regions of the equatorial tropical Pacific the forecast graphs (called plume diagrams), show the predicted area average of monthly mean sea-surface temperature anomaly for each member of the ensemble forecast (red lines). The observed  sea surface temperature anomaly for the six months preceding the forecast is also shown (black line).

Plume diagrams are provided for regions Niño3 (5° S-5° N, 150° W-90° W), Niño3.4 (5° S-5° N, 170° W- 120° W) and Niño4 (5° S-5° N, 160° E-150° W). These areas are commonly used for monitoring the anomalous warming and cooling in sea-surface temperature in the equatorial tropical Pacific associated with El Niño and La Niña. In particular, Niño3.4 is a commonly used indicator for the likely impact of El Niño and La Niña events on associated widespread global climate variability around the globe.

Further information is available on El Niño and La Niña and their impacts on the global climate.

The Met Office contributes to the World Meteorological Organization's (WMO) statement on the state of the tropical Pacific.

WMO El Niño/La Niña Update