Many rainfall records for September broken

By Peter Nelson on October 04, 2016
  • Many rainfall records for September broken

    Many rainfall records were broken at places around Victoria last month.

Last month was noteworthy for many rainfall records broken at places. Some of these include Coonabarabran, 218 mms, Moree, 137.8 mms, Parkes, 187.4, Gulgong, 198, Corowa, 127.4, Yarrawonga, 138.2, Benalla, 139.3, Bendigo, 153.4 and over in SA, Clare, 198.8 mms. Both Clare and Bendigo have rainfall records dating back to 1861. Bendigo's figure was slightly more than those of Septembers of 1867, 1870, and 1916.  

Benalla's record 139.3 mms for September completed the wettest May to September period for 99 years with 537 mm. Other very wet May to Septembers at Benalla were in 1889 and 1870. The year 1870 was noteworthy of very wet conditions and record floods along the Murray River from April through to October. The heavy rain had tapered off during December but arrived with a vengence in both January and February 1871.

Daylesford which had it's wettest May to September period up to the 18th September had a further 40 mms last week taking the September rainfall there to 215.6 it's wettest September since 220.2 mms in September of 1867.

The main feature of the weather last week were the violent thunderstorms of a widespread nature over SA which blacked out most the state last Wednesday 28th September. Much structual  damage was done. A very deep low pressure brought the lowest barometer reading in 160 years of records at Adelaide. The  reading of 978.4 mbs or 28.89 inches was recorded at 7 am 29th September after a very big fall of 28 mbs in the preceding 24 hours. At Cape Borda the barometer had fallen to 974.3 mbs, 28.77 inches even lower as the low centre passed directly over Cape Borda. Previously no place in SA ever had a low barometer reading less than 984 mbs. There was a very low reading of 986 mbs in February 1946 when some places had up to 200 mms rainfall in 24 hours.

Further heavy rain at Christmas Island and the September rainfall had finally reached 702 mms and this is 16 times the monthly average. The above normal temperatures at Christmas Island and Cocos Island out in the Indian Ocean since August last year did continue during September despite the very heavy rain. The overall wettest recorded month at Christmas Island was 895 mms in February 1975. February is usually the wettest month of the year.    

By Peter Nelson on October 04, 2016

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