SSC
WORLD GEOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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> Generally can reduce the number of hurricanes experienced during the Atlantic season.
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Generally increases the number of hurricanes experienced during the Atlantic hurricane season.
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Causes a more active tornado season for regions impacted by tornadoes.
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Can result in crop damage and landslides in California and flooding in the Southern US.
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Detailed explanation-1: -During La Niña, westerly winds high in the atmosphere weaken. This results in an expanded area of low vertical wind shear, allowing more Atlantic hurricanes to develop during La Niña events. La Niña increases the number of hurricanes that develop and allows stronger hurricanes to form.
Detailed explanation-2: -La Niña conditions favour cyclone formation. La Niña years are infamous for frequent and intense hurricanes and cyclones in the Atlantic Ocean and the Bay of Bengal.
Detailed explanation-3: -Outside the tropics, the atmospheric circulation change during La Niña (footnote 2) causes warming over much of the North Pacific and cooling over Alaska and western Canada, but the surface temperature effect is small when averaged over the globe outside of the tropics.