USGS B 2187: Table 1

Table 1. Data from the Climate Prediction center of the National Oceanic and Atmospheric Administration, 1950-99, used by Poore, Darling, Dowsett, and Wright (PDDW, this study) to identify El Niño and La Niña conditions.

[Seasons: JFM, January, February, and March; AMJ, April, May, and June; JAS, July, August, and September; OND, October, November, and December. Conditions: W, warm; C, cool; +, strong condition, -, weak condition. The CPC data are a seasonal assessment of warm (El Niño) and cool (La Niña) conditions based on sea-surface temperatures in the tropical Pacific Ocean since 1950 (see http://www.cpc.noaa.gov:80/products/analysis_monitoring/ensostuff/ensoyears.html). Years with El Niño or La Niña conditions in all four seasons were classified as an El Niño or La Niña event as appropriate. In general, years with moderate or strong El Niño or La Niña designations in two or more seasons were identified as events if the seasons were adjacent. The year of the event was based on the likely effects of the event.]

Administration, 1950-99, used by Poore, Darling, Dowsett, and Wright (PDDW, this study) to identify El Nino and La Nina conditions