Causes of El Nino.
No one knows exactly how El Nino forms, but scientists do know
mostly how. The long process begins with a shift in air movement over the mid-Pacific Ocean.
This shift changes wind direction and ocean circulation, which in turn
heats water and disrupts air movement. This is how El Nino forms. The
shifting wind and warmer water forms storm systems and causes odd climates
for some regions.
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Where it occurs
Safety
History of El Nino
Damage
Last revised: April 30, 1998