- (E) A La Niña effect may be defined as a drop in average sea-surface
temperatures to more than 0.7°F (0.4°C) below normal, lasting at least six
months, across parts of the eastern tropical Pacific. When La Niña forms,
the hurricane season is affected as the cooling water creates dramatic
changes in the upper-level air currents that play a major role in storm
development. During La Niña, high-level westerly winds either weaken or
shift to come from the east, allowing more storms to develop.
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(Marvins-Underground-K-12)
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