Sydney Storm, page-6

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    There have been numerous other severe East Coast Lows in the historical record, with an East Coast Low in May 1974 also causing the shipwreck of the MV Sygna on Stockton beach, north of Newcastle.
    At Sydney, the 24 hour total to 9 am on the 21st is the wettest individual day in more than 10 years. However, there have been more than 60 wetter days in Sydney since records began in 1858, including an incredible 328 mm during an East Coast Low on August 6, 1986.
    This latest East Coast Low is a severe event, but not a record. In fact, Sydney experiences rainfall above 100 mm almost once a year on average, so this is a normal feature of our climate.
    And before you ask, is climate change to blame?

    The difficulty in deciding on exactly what separates an East Coast Low from other systems, the very large year to year variability in their frequency, as well as large inconsistencies in the East Coast Lows identified when we use different data sources and computer methods, make this a very difficult question to answer.
    However, recent research is suggesting that the frequency of East Coast Lows, particularly the major winter systems that cause large waves, may actually decrease over the coming century given current climate projections.

    https://theconversation.com/explain...term=Acacia Pepler and Lisa Alexander explain
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