Keywords: ONI 1997 2001.png en Oceanic Nino Index ONI graph from 01/01/1997 to 12/31/2001 green line with the La Nina conditions treshold blue line and El Nino condtions treshold red line original data from http //www cpc noaa gov/products/analysis_monitoring/ensostuff/ensoyears shtml NOAA fr Graphique de l'Indice Océanique d'El Nino du 01/01/1997 au 31/12/2001 ligne verte avec le seuil des conditions La Nina ligne bleue et le seuil des conditions El Nino ligne rouge données provenant de la http //www cpc noaa gov/products/analysis_monitoring/ensostuff/ensoyears shtml NOAA own Arh'lupia pour la création du graphique donées provenant de la http //www cpc noaa gov/products/analysis_monitoring/ensostuff/ensoyears shtml NOAA Arh'lupia to create the graph original data http //www cpc noaa gov/products/analysis_monitoring/ensostuff/ensoyears shtml NOAA 2010-08-24 1997 Atlantic hurricane season 1998 Atlantic hurricane season 1999 Atlantic hurricane season 2000 Atlantic hurricane season 2001 Atlantic hurricane season El Nino |