Skip Navigation Links weather.gov 
NOAA logo-Select to go to the NOAA homepage National Weather Service Forecast Office   Select to go to the NWS homepage
Pacific ENSO Applications Climate Center
banner piece
  banner piece
Local forecast by
"City, St" or Zip Code
Pacific ENSO Update

2nd Quarter, 2010 Vol. 16 No. 2


SOUTHERN OSCILLATION INDEX (SOI)

The 3-month average of the Southern Oscillation Index for the 1st Quarter of 2010 was -1.7, with monthly values of –1.5, -2.1 and –1.4 for the months of January, February, and March 2010, respectively. These recent, persistently negative Southern Oscillation Index values are historically consistent with a moderate-strength El Niño.

*Note: Normally, positive SOI values in excess of +1.0 are associated with La Niña conditions, and negative SOI values below -1.0 are associated with El Niño conditions. Low SOI values suggest a weak coupling between the ocean and the atmosphere. The SOI is an index representing the normalized sea-level pressure difference between Darwin, Australia and Tahiti, respectively. The historical record of the SOI from 1866 to present was calculated based on the method given by Ropelewski and Jones (1987). The complete table can be found at http://www.cru.uea.ac.uk/cru/data/soi.htm.


Standardized Southern Oscillation Index


Pacific ENSO Applications Climate (PEAC) Center
c/o NOAA NWS - Weather Forecast Office Honolulu
2525 Correa Road, suite 250
Honolulu, HI 96822
(808) 956-2324

Web Master's email: peac@noaa.gov
Page Last Modified: August 04 2011 22:27:11 GMT

Disclaimer
Credits
Glossary

Privacy Policy
About Us
Career Opportunities