The passage of yet another low pressure complex with the development of a dual low pressure over inland Australia resulted in another set of rainfall records for late August and early September. Heavy rain fell early last week at Broome with 47.6 mms which was the heaviest August rain for 97 years. . The month's average rain for August at Broome is only one millimetre. and there has been only three cases when the August rainfall exceeded 20 mms in the last 130 years; in 1919, 1947 and 1978. The last two led to excessive rains in our regions right up to the end of December. Fitzroy Crossing had it's heaviest August rain with 46 mms on record in 123 years of records, the previous record was back in 1933 which saw excessive rains during the Spring and also the following summer up to early February in our regions.
In South Australia, Leigh Creek received 62 mms and Coober Pedy 61 mms in less than 24 hours, both being records for August. Previous August records was back in 1973 which was very very wet in our regions from August until January 1974.
Ayres Rock and Alice Springs both recorded their heaviest August rains since 1975 and that year also saw excessive rains in our regions up to February 1976.
The dual low pressure development brought heaviest daily falls for September at Birdsville, 44.8 mms, since 55.6 mms fell in September 1947. Wilcannia with 41 mms, Walgett with 44.8 mms and Coonabarabran with 71 mms to last Friday morning all had their highest daily falls for September since 1903. Over two days Coonabarabran received 107 mms which just breaks the September 1903 two day record of 104.6. The last four months of 1903 and the first two months of 1904 were also very wet indeed in our regions.
The big question is when it is going to stop raining. There will be a bit of a dry break around the middle of this month with maximum temperatures being above normal and apart from that significant dry conditions not arriving before next March. Significant hot weather not occurring much before next January.