An east coast low is set to form off the southeast Queensland coast late Monday. It will bring heavy rain and dangerous winds as it tracks southwards along the coast. East coast lows are low pressure systems that form dangerously close to Australia's eastern seaboard. These systems are notorious for producing severe weather such as flooding rain, dangerous seas and damaging wind gusts. Between Monday and Wednesday the low will move from southeast Queensland down to the mid NSW coast. Heavy rain and strong winds will assail a broad region from Wide Bay down to the Hunter, with moderate rainfall totals extending further south, including Sydney and possibly the Illawara. By late Wednesday and Thursday the focus will shift, with regions south from the NSW Mid North Coast receiving the heaviest rain and strongest winds. Three-day rainfall totals of 100mm or more are likely for parts of eastern NSW and southeastern QLD. Keep track of severe weather warnings, the latest forecasts and up-to-date observations at weatherzone.com.au.