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Unusually Intense Rain Floods Southern Africa
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Published January 29, 2008
Heavier-than-normal rainfall in January 2008 brought flooding to parts of southern Africa. The hardest hit areas included Zimbabwe, Zambia, Malawi, and Mozambique.
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La Nina Rainfall Patterns
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Published January 23, 2008
La Niña, the counterpart to El Niño, alters rainfall patterns over the Pacific and Indian Ocean basins. La Niña develops when stronger-than-average trade winds push the warm surface waters of the equatorial Pacific west. Since cold water rises to replace the warm water, La Niña leaves the eastern and central Pacific Ocean much cooler than normal, while the western Pacific is much warmer than normal. These anomalies in sea surface temperature are mirrored in rainfall patterns, with warmer-than-normal temperatures resulting in enhanced rainfall. In general, La Niña brings unusually heavy rain to the West Pacific, Indonesia, parts of Southeast Asia, and northern Australia.
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Small Tropical Cyclones Contribute More to Annual Rainfall
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Published January 19, 2008
Though relatively infrequent, tropical cyclones make a significant contribution to the seasonal accumulation of rainfall in the southeastern United States. In a recent study, Dr. Marshall Shepherd and collaborators at the University of Georgia found that tropical storm systems contribute an average of 13 percent of the total rainfall during the hurricane season.
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