A rain band with embedded thunderstorms lies over the southern half of the NSW coast and adjacent ranges. The band will weaken in the south and move northward overnight and tomorrow. The highest rainfall totals reported in the 6 hours to 3pm are 155mm at Grassy Gully on the Shoalhaven river, northwest of Nowra, 103mm at Nowra, and 73mm at Kentlyn in southwestern Sydney.
Very heavy rain is expected to cause localised flash flooding in the Sydney Metropolitan area, the Hunter, Illawarra, South Coast and about eastern parts of the Southern and Central Tablelands districts. The rain is expected to ease in the south overnight and extend to the Mid North Coast tomorrow.