You may have heard the terms “El Niño,” “La Niña,” and “La Nada” in the news....
You may have heard the terms “El Niño,” “La Niña,” and “La Nada” in the news, but since their literal translations (“the little boy,” “the little girl,” and “the nothing,” respectively) don’t immediately explain what they mean, it requires some deeper digging to understand how these phenomena impact weather. These three amigos are major factors in droughts, floods, snowstorms, hurricanes and wildcard events all over the world.
El Niño describes the relaxation of trade winds that normally blow east to west. These relatively calm winds consequently warm the stagnant waters of equatorial Pacific Ocean. The warm water can harm marine life that is used to the cooler sea temperatures, while causing an unusually strong jet stream to bring torrential rains and cooler temperatures to the southern tier of the United States and portions of South America. Conversely, because the jet stream is forced to split, drought conditions and warmer than normal temperatures result for much of the western U.S.
La Niña has the opposite effect. Trade winds along the equator blow from east to west, causing colder deep sea water to well up to the surface. For reasons still being studied, this causes cooler and wetter than normal conditions for the Northwest and warmer and drier than normal conditions for the Southeast.
La Nada simply describes a “neutral” or normal pattern. Without the strong influence of either El Niño or La Niña, it becomes difficult to generalize an overall weather pattern, bringing a mixed bag of extreme to benign weather—sometimes all within the same week.
The effects of El Niño and La Niña peak during the Northern Hemisphere winter, which is why our winter months can be dramatically warmer or colder than usual. While it is not guaranteed an El Niño event will follow a La Niña, or vice versa, it is estimated that one of these large-scale weather patterns will develop every two to seven years. According to the National Oceanic and Atmospheric Administration, since 1975, La Niñas have been only half as frequent as El Niños.
http://local.msn.com/el-niño-la-niña-and-la-nada-the-three-amigos
"We can ask for more.
Nature is a whore."