A Queensland farmer has died after his car was washed away in flood waters near the NSW border after days of heavy rain and thunderstorms.
Police say the 69-year-old Killarney man was moving cattle to higher ground at a property along the Condamine River when flash flooding washed his car away about 8pm on Wednesday.
His body was found inside his vehicle by emergency services just after midnight.
The Bureau of Meteorology says thunderstorms that have inundated northern NSW and southeast Queensland for nearly a week will continue for days, with heavy rain falling in already waterlogged areas from the Tweed to Byron Bay on Thursday.
Bilambil Heights in the Tweed region at 11am had already recorded 64mm in one hour.
A fresh warning from the weather agency was issued for Gravesend, east of Moree.
Moderate flooding is expected there, and major flooding downstream at Yarraman Bridge.
Minor flooding is also possible along the Mehi River at Moree on Saturday.
A renewed flood warning has also been issued for Murwillumbah and Tumbulgum, which were inundated only days ago.
Waters are expected to reach moderate levels from Thursday evening.
Just over the border on the Gold Coast, all beaches are closed as council workers work to clear debris that has washed up.
Their efforts are likely to be hampered by a "very dangerous" thunderstorm due to hit Coolangatta.
Intense rainfall that may lead to dangerous and life-threatening flash flooding is likely, the BOM says.
A severe thunderstorm warning has also been issued for parts of the Gold Coast, Nambour, Cooroy and Imbil.
Almost all of NSW - from the Queensland border and Lismore in the north, to Albury at the Victorian border and the entire central west - was hit by severe thunderstorms and heavy rainfall on Wednesday.
Lismore in northern NSW was drenched, copping more than 120mm of rain in just three hours.
There was flash flooding in the town's CBD and minor flooding of the Wilsons River, prompting 136 calls for help and 15 flood rescues, SES Assistant Commissioner Sean Kearns said.
"That was caused by a number of showers and thunderstorms that just kept targeting the one place - we call this a train of storms," meteorologist Helen Kirkup said.
A minor flood warning remains for the Wilson river, although levels are falling.
Further south, river levels at Coraki and Bungawalbin peaked overnight, but minor flooding remains.
Coutts Crossing near Grafton is also flooded. The Orara River peaked late on Wednesday night, and is expected to stay at a moderate flood level until Friday morning.
More storms and rain are forecast for the coming days, Ms Kirkup said.
"We will see severe thunderstorms in a fairly broad region which does include Sydney, the Blue Mountains, and the Central West," she said.
"We could get some intense rainfall from this, and we could also potentially get into damaging winds or hail."
"Those northern rivers, north coast, and northern tableland areas will continue to see thunderstorms (but) tomorrow, they're less likely candidates for them to be severe."
