In accordance with the revision of the climatological normal for climate system monitoring, all the analysis charts and monitoring indices concerned (e.g., 500-hPa geopotential height, outgoing longwave radiation and the Southern Oscillation index) were updated on 18 May 2011, using the new normal (i.e., the 1981 - 2010 average).
However, the descriptions on highlights until April 2010 remain based on the old normal.
Tokyo Climate Center, Climate Prediction Division, 1-3-4 Otemachi, Chiyoda-ku, Tokyo, Japan.
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