In the 1930s, English climatologist Sir Gilbert Walker successfully predicted Indian summer monsoon rainfall (ISMR) based on the relationship between Southern Oscillation and ISMR connected by what was later called Walker circulation, which is regarded as the first achievement of modern climate prediction with a clear physical mechanism. The Southern Oscillation was also recognized as the atmospheric component of El Nino-Southern Oscillation (ENSO).
Click here for original story, The relationship between ENSO and Indian summer monsoon rainfall is re-strengthening
Source: Phys.org