The hemispheric long wave pattern has remained stable in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, Western Australia, eastern Australia, New Zealand, the southeast Pacific, and South America.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 1 May to 5 May, 17 May to 21 May, and 23 May to 27 May. Rain events originating in the tropics and moving south are possible about 17 May to 21 May.
Over Western Australia the strongest cold fronts should occur about 28 April to 2 May, 20 May to 24 May, and 24 May to 28 May.