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2010-11 La-Niña keeps getting stronger and possible become strongest since 1988-89 La Niña episodes. Latest Oceanic Nino Index (ONI) seen above, August-October time shows a -1.3˚C SST anomalies, almost double of 2007-08 (-0.7˚C) and even lower of 0.3˚C at 1998-99 (-1.0). As La-Niña matures during winter season, continues drop of ONI expected and possible to duplicate or even stronger compared to 1988-89 episode.
Nearly all models indicate that La Niña (Niño-3.4 SST anomalies -0.5˚C or less) will persist at least into the Northern Hemisphere spring 2011, however, possible strengthening is expected till Northern hemisphere winter.
For more info just visit El-nino/la nina page
Figures Source: NOAA
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