This year’s warm El Nino weather will be replaced sometime after May by an opposite phenomenon, according to the World Meteorological Organization.Information gathered from the MSNBC web site says La Nina is caused by a change of the Pacific trade winds, which cools the waters off the west coast of Peru, causing a change in climate.If La Nina develops, we will have substantially cooler weather in the winter and much dryer weather in the summer time, said Jeffrey Rogers, professor of geography.La Nina last struck in 1988 and contributed to a major summertime drought in the Midwest.El Nino, Spanish for “the little boy,” usually arrives in December and is followed by La Nina, Spanish for “the little girl,” in the spring.However, this year’s El Nino started in the spring of 1997.This irregularity makes it tougher to forecast when La Nina is going to hit Columbus, said Jay Hobgood, associate professor of geography. However, there is evidence indicating La Nina is going to happen.Generally, there is a transition period between El Nino and La Nina, Rogers said.”I would be a little surprised if it happened right away,” he said. “It might wait a year.”Farmers can use this long term forecasting to help protect their crops from low temperatures and possibly postpone planting, said Richard Funt, professor of Horticulture & Crop Science.He said if La Nina occurs before May, it could cause significant damage to flowers and plants and the fruit crop could be lower than normal.