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The interannual variability of precipitation in El Nino/Southern Oscillation-neutral years was studied for the Centro de Lancamento de Alcântara region. Monthly precipitation, sea surface temperature, wind at 925 hPa and outgoing longwave radiation data from various gridded datasets for the 1951–2010 period (60 years) were used. The data grouping was based on terciles. For the Centro de Lancamento de Alcântara in El Nino/Southern Oscillation- Neutral years, March is the month of the rainy quarter (March to May), when the interhemispheric gradient of the sea surface temperature anomalies over the Atlantic (GRAD)and the atmospheric circulation at 925 hPa over the Centro de Lancamento de Alcântara were able to best explain the variability of precipitation. In this month, the wind direction at 925 hPa was the factor that explained the highest fraction of precipitation variance (40%), followed by GRAD (30%) and the wind magnitude (20%). For the Centro de Lancamento de Alcântara, in general, above-average precipitation was related to weak north-northeasterly low-level winds and southward GRAD, while below-average precipitation was related to strong east-northeasterly low-level winds and northward GRAD.These features were related to an eastward expansion of the Amazon convection towards the northern Northeast Brazil and might be related to a slight southward displacement of the Intertropical Convergence Zone in above-average precipitation years.

Interannual Variability of Precipitation for the Centro de Lançamento de Alcântara in ENSO-Neutral Years