An offshore low pressure system, supported by a persistent pool of upper cold air has lead to some healthy rainfall totals over the last few days across northeastern parts of New South Wales. A number of rain gauges in the Wilsons and Richmond river catchments have recorded in excess off 300mm since 9am on Friday, hence the minor flood warning in place. In proximity to the Wilsons river, Terania Creek and Tuckurimba picked up 336mm and 322mm respectively, while Tuckombil and Houghlahan Creek located in the Lower Richmond River collected collected 362mm and 348mm respectively. We are not even half way through the month yet and the total rainfall recorded so far has more than tripled the June average in Casino, with 220 mm over the past four days compared to the average of 72mm. Lismore Airport and Ballina have also comfortably exceeded their total average June rainfall over the same time frame, with 261mm and 256mm collected. A severe weather warning remains in place for Northern Rivers and Mid North Coast for heavy rain and thunderstorms, which could lead to flash flooding. The system responsible will drift northwards through the course of today. This is allowing conditions to ease over the Mid North Coast, but further heavy rain is likely for the Northern Rivers, with an additional 100mm or more possible by the end of Thursday. The system is also causing gales to develop along the Byron Coast, with southeasterly wind gusts exceeding 80km/h recorded at Cape Byron this morning. Gales are a risk here for at least the next 24 hours. With flash flooding a distinct possibility, remember not to enter floodwater and keep clear of storm drains and creeks. Keep up to date with the latest weather warnings at http://www.weatherzone.com.au/warnings.jsp