The hemispheric long wave pattern has been relatively slow moving in recent weeks. There are three main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, Western Australia, and the southeast Pacific. Summary: Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 29 November to 3 December, 15 December to 19 December, and 19 December to 23 December. Rain events originating in the tropics and moving south are possible about 2 December to 6 December, 12 December to 16 December, and 16 December to 20 December. Over Western Australia the strongest cold fronts should occur about 2 December to 6 December, 13 December to 17 December, and 17 December to 21 December.
http://www.weatherzone.com.au/long-range-forecast/28-day-rain/nsw/cw-slopes-and-plains
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