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GENEVA- The U.N. weather agency says the weather phenomenon known as El Nino that brings above normal rainfall could develop between July and September.

The World Meteorological Organization says it is uncertain how strong any such conditions might be.

Past El Ninos have been associated with drought in Australia, Indonesia and northeastern parts of South America, and with heavy rainfall in Ecuador and northern Peru.

WMO spokeswoman Clare Nullis told reporters Tuesday in Geneva that her agency sees a "slight chance" for the return of El Nino conditions, which are characterized by unusually warm ocean temperatures in the central and eastern equatorial Pacific.