A full blown La Niña requires three overlapping three month periods, i.e. 5 continuous months. For example:
JJA;JAS;ASO...
The little girl can raise hell with the weather, I'll get into the effects in a few weeks.
From Climate Observations:
Reynolds (OI.v2) SST anomaly data shows all four NINO regions well into La Niña territories.
http://www.srh.noaa.gov/images/mlb/enso/nino-regions.gif
Map of NINO Regions
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http://i26.tinypic.com/20k9elt.jpg
NINO3.4
...MORE
