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TRMM Tropical Rainfall Measuring Mission
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image showing Last 30 day average rainfall image showing Last 30 day rainfall anomalies (CLICK TO ENLARGE)
The rainfall anomaly analysis shown above was made by comparing rainfall data compiled during the twelve year period from 2001-2012 to "near real-time" Multi-satellite Precipitation Analysis (TMPA-RT 3B42RT) data collected in the past 30 days.

See 30 day rainfall images above in Google Earth

The ENSO Precipitation Index (ESPI) for the last 30 days is 0.70

ESPI is calcuated with precipitation anomalies from two areas (Figure 1) in the Pacific Ocean and quantifies the strength of ENSO, in terms of regional rainfall changes. A detailed summary of the methodology can be found at http://trmm.gsfc.nasa.gov/ESPIsummary.html . Time series of the bimonthly El Niño Index (EI), La Niña Index Precipitation Index (ESPI) are shown in Figure 2 .

Link to graph showing area of computation Figure 1 (click to enlarge)

Link to graph showing time series of values
Figure 2 (click to enlarge)

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Curator: Harold.F.Pierce@nasa.gov
NASA Official: Dr Scott A. Braun

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