Hello, Michelle, Emily, Tom, Anthony,, and Rebecca, Thanks for this series on ENSO... ocean/atmosphere delayed action oscillator. Very helpful. One can see why the Walker cell shifts precipitation patterns in the tropical zones. How does one explain how the Hadley cells and Ferrel cells react to the eastward (westward) shifts of the Walker cell(s) and consequently the changes in northern and southern jet streams ? Joe Witte (also a contractor (adnet).. for NASA-Goddard