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Welcome What is La Niña? Current Status and Forecast Comparing La Niñas Global Effects Canadian Effects Further Readings El Niño Other Educational Sites |
La NiñaGlobal EffectsGlobal Impacts.
Present Effects of La NiñaAs a rule, the effects of La Niña are more direct and dramatic during the Northern Hemisphere winter. La Niñas may affect weather patterns in certain parts of the world, causing abnormally high rainfall in southeast Asia and dry conditions in the desert areas of South America. Some impacts of previous La Niñas include:
Global Impact Map
HurricanesImages/Movies of Hurricanes There is an increased likelihood of above-average tropical storm and hurricane activity over the North Atlantic during August-October 1998 in response to developing La Niña conditions, according to a consensus reached by scientists at the National Oceanic and Atmospheric Administration's (NOAA) Climate Prediction Center (CPC), National Hurricane Center (NHC) and Hurricane Research Division (HRD). There is also an increased likelihood of more hurricanes reaching major hurricane status during this period. In the past, La Nina episodes have contributed to active hurricane years by reducing the variation in winds with height (termed vertical wind shear) over the tropical North Atlantic and the Caribbean Sea. This reduced vertical wind shear is expected to develop over the next several months in response to the ongoing La Nina conditions. Also in the tropical North Atlantic, if the present abnormally warm sea- surface temperatures persist, then they will also contribute to enhanced activity during this period. Predicted Effects of La NiñaSee the forecast section. Past Effects of La NiñaThe National Weather Service Climate Analysis Center site shows effects on U.S. temperatures and precipitation of strong La Niñas in the past during different times of the year. Some of material on this page originates with organizations not subject to the Official Languages Act and is only available in the language in which it was written. Links |
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Created :
2002-08-26
Modified :
2003-09-12
Reviewed :
2003-09-12
Url of this page : http://www.msc.ec.gc.ca
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