Super Moon to Bring Wild Weather to Sydney Maroubra Seals winter swimming club members brave the wild weather at Mahon pool. Heavy rain, damaging winds and high tides caused by a super moon are forecast to hit Sydney from about 9am on Monday as emergency services brace for a day of wild weather. The Bureau of Meteorology has issued a severe weather warning for damaging winds and surf, rain and "abnormally high tides" for the Sydney, the Illawarra, Hunter, south coast and coastal regions. The weekend's heavy rain was caused by a trough sitting off the coast, but a low pressure system is forecast to develop in that trough to create Monday's wild conditions. Super moon: Shocking weather. Weatherzone meteorologist Sam Brown said the rain would intensify in Sydney from about 9am on Monday and persist throughout the day, easing between 2pm and 5pm. Widespread falls of between 25 to 50 millimetres are forecast to fall in Sydney, accompanied by strong winds. "Those winds will be quite strong, between 30-40km/h for most of the day but there could be some gusts up to 70km/h," Mr Brown said. Falls of between 50 to 100 millimetres are forecast in areas between Port Macquarie and Bega, and locally heavy falls of about 150 to 200 millimetres in the Illawarra and northern parts of the south coast, according to the bureau. But the ground is already soaked from weekend downpours. Sydney had received 52.6 millimetres of rain between 9am on Sunday and 6.30am on Monday. Terrey Hills was soaked in 85.6 millimetres of rain in the same period, while Gosford and Bellambi received 63 millimetres. The heaviest rainfall was at Norah Head, on the central coast, which received 126.4 millimetres. The bureau has issued an alert for minor to moderate flooding on rivers including the Nepean-Hawkesbury River and Georges, and the tidal zones of the Cooks and Woronora Rivers. On top of the low pressure trough off the coast, the moon would be closer to Earth than usual - 356,991 kilometres away to be exact - at 9.12pm on Sunday, before a full moon at 9.32pm, Sydney Observatory acting manager Geoffrey Wyatt said. The moon's closest approach to Earth at roughly the same time as a full moon created what is known as a super moon. "The time is perfect," Mr Wyatt said. He said the super moon would create slightly higher tides. NSW State Emergency Service spokeswoman Danielle Wearne said there were reports of trees down and roof damage, but volunteers were preparing for a much busier day on Monday. The SES warned people to secure loose items in their yards and move cars away from trees. Ms Wearne said: "Check on your neighbours ... and never drive or walk through floodwaters." Weatherzone.com.au is owned by Fairfax Media, publisher of this website.