History of La Ni a chart La Ni a, opposite not only in principle but also in her effects, causes almost a reverse in climatic conditions around the globe. Historically, La Ni a enhances the Huricane season in the Atlantic and Gulf States and surpresses Huricanes and Tropical Storms in the Eastern Pacific. Droughts occur in Southern and Central America along with California and the Southwest United States. The Pacific Northwest experiences a colder winter with more snow at lower elevations. La Ni a also been found to enhance the production of tornados from Ohio to the Tennessee River Valley.
Mass flooding occurs in Indonesia, Eastern Australia, and Southern Asia.
El Ni o, why La Ni a occurs still remains a mystery. La Ni a forecasts, models, and communicate with the public. As of July 26, scientists at NOAA, Scipps, and JPL were all issuing conflicting forecasts on the latest cooling of the Pacific waters. El Ni o with the cool waters off the coast of South America. Scientists at NOAA and the Scipps Institute, in contrast, forcast a strong La Ni a to develop into late 1998.