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Seasonal global tropical OLR anomalies (watts per square meter) for September to November 2007 computed with respect to the 1979–2006 base mean period. Negative OLR anomalies are an indicator of convective activity associated with positive SST anomalies in the western equatorial Indian Ocean and the equatorial eastern-central Pacific Ocean regions. Positive OLR anomalies are indicative of severe drought conditions in Southeast Asia.
