Global Setting – October 2011

A weak to moderate La Niña is in place in the tropical Pacific and is likely to persist to at least January 2012. For November-January, mean sea level pressures are likely to be near or above normal across New Zealand, with weaker westerlies than normal over the country, on average.

Sea Surface Temperatures

Sea surface temperatures are likely to remain near normal around New Zealand. 

Differences from average global sea surface temperatures for 2nd October 2011 to 29th October 2011. 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). Estimated SOI mean values: October SOI +0.6; August to October average +0.6.
Differences from normal October surface temperatures in the seas around New Zealand.