El Niño Southern Oscillation events can cause flooding from both a rise in sea level and high precipitation.

Question

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Sea level can rise up to 20 centimeters in the eastern Pacific during ENSO events. There is more evaporation occurring due to the higher temperatures in the region which intensify the abnormal low pressure conditions. This creates high precipitation. Information can be found in the section El Niño and La Niña Are Exceptions to Normal Wind and Current Flow.

El Niño Southern Oscillation Events Can Cause Flooding from Both