Latest News about Geosciences http://www.weatherworks.com/ SAT 18 July 2009 15:15:00 GMT us-en July 9, 2009: NOAA scientists have announced the arrival of El Niño, a climate phenomenon that often significantly influences global weather, ocean conditions and marine fisheries. El Niño, the periodic warming of central and eastern tropical Pacific waters, occurs on average every two to five years and typically lasts about 12 months. http://www.noaanews.noaa.gov/stories2009/20090709_elnino.html