article_snippet.sent: They can also dump hundreds of millimetres of rain, causing flash flooding and riverine flooding.
article_snippet.sent: On Monday night 24 Sydney suburbs incurred 100mm of rainfall, with Blacktown hit hardest, thanks to the latest East Coast Low.
article_snippet.sent: In August 1998, more than 300mm of rain fell over four days in Sydney and Illawarra, 420mm at Beaumont and 401mm at Kangaroo Valley.
highlights_snippet.sent: They are particularly common in June and can dump hundreds of millimetres of rain .
  