Seasonal climate summary southern hemisphere (winter 1991): a warm Pacific episode develops

A climate analysis is given of the southern hemisphere winter circulation, June, July and August (JJA) 1991, with more detailed treatment of the Australian region. In the equatorial Pacific, winter sea-surface temperatures (SST) were generally above average and weak low-level westerly anomalies were observed. A three-wave planetary wave pattern was evident with deep troughs in the Pacific and the eastern Indian Ocean, and a weaker trough in the south Atlantic. There was a marked variation in rainfall across Australia.