A summary of the tropical circulation from 70°E to the date-line, for November 1990 to April 1991, is presented. The Southern Oscillation did not exert any notable influence during this period. The Australian northwest summer monsoon was stronger than normal, resulting in above average rainfall over northern Australia. The Asian northeast winter monsoon was weaker than normal, resulting in below average rainfall across South-East Asia. In the western Pacific, tropical weather was more (less) active than normal north (south) of the equator. Associated with this, the Hadley circulation was anomalously weak in that region, and fewer cyclogenesis events than normal occurred in the southwest Pacific.
Stringer et al. (Wed,) studied this question.
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