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Global Setting – April 2010

4 May 2010

The tropical Pacific El Niño has weakened considerably since February, and conditions are likely to return to neutral by the end of May. During May-July, mean sea level pressures are likely to be below normal south of the country, with enhanced westerly flow over New Zealand.

 
Differences from average global sea surface temperatures for 4th April to 1st of May 2010. Map courtesy of NOAA Climate Diagnostics Centre (http://www.cdc.noaa.gov/map/images/sst/sst.anom.month.gif).
 

Monthly values of the Southern Oscillation Index (SOI), a measure of changes in atmospheric pressures across the Pacific, and the 3-month mean (black line). SOI mean values: April SOI +1.7 (highest 1-month value since Nov-2008); February to April average -0.5.


Differences from normal April surface temperatures in the seas around New Zealand.

Sea surface temperatures

Sea surface temperatures are expected to remain above average in the Tasman Sea, and below average to the south and southeast of New Zealand. 

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