A man has died and a woman has been rescued from floodwaters in Queensland, as the state’s south-east and northern NSW are warned to expect more dangerous rain.

Queensland Police confirmed on Monday morning that a man had died in floodwaters in Kingsthorpe, near Toowoomba.

They were called early on Monday to help with a swift water rescue at Kingsthorpe after a vehicle with two occupants became trapped.

“A woman was rescued and taken to hospital in a stable condition for treatment,” they said in a statement.

“However, a man was located deceased in the ute. A number of dogs also died.”

The ABC is reporting also that another man was stranded on top of a truck in floodwaters, also near Toowoomba, on Monday morning. Emergency services were working out how to rescue him.

It came as areas hit by record floods earlier this month were warned to expect more torrential rain on Monday and Tuesday, as a slow-moving and potentially dangerous weather system moves south over the Queensland and NSW border.

There is a severe weather warning in Queensland for the Sunshine Coast south to the NSW border and the Darling Downs. Thunderstorms and heavy downpours are likely.

Up to 100 millimetres of rain is expected in Brisbane on Monday, as the system passes through.

Tweet from @BOM_NSW

A coastal trough is expected to deepen later in the day, with intense storm cells continuing into Monday and Tuesday.

Six-hourly rainfall totals of 80-140 millimetres are possible, with up to 180 millimetres in coastal areas and ranges.

“Intense rainfall leading to dangerous and life-threatening flash flooding is possible, with thunderstorms with six-hourly rainfall totals up to 250 millimetres,” the weather bureau said.

In NSW, the bureau has warned heavy rain may lead to flash-flooding in parts of the state’s north-east in the same timeframe. Similar rainfall totals are likely in the forecast zone, which includes Tweed Heads, Murwillumbah, Byron Bay, Lismore, Yamba, Grafton, Coffs Harbour and Dorrigo.

The warning of more heavy rain came as the northern rivers community continues cleaning up after floods damaged and destroyed thousands of homes and businesses in the region earlier this month.

“It won’t bloody stop raining up here,” Lismore Mayor Steve Krieg told the Nine Network on Monday.

“The forecast doesn’t look good … The next two days is critical for how Lismore is going to fare over the next week.

“This is a major development, this weather front. If our river rises, we’re going to start the evacuations today just to be cautious.

“But there’s a lot of infrastructure that’s been temporarily put in place that we’re going to have to pack up and move out of the CBD area.”

The public school in the riverside town of Woodburn is expected to reopen on Monday, and some businesses in the northern rivers were planning to recommence trading.

“All these people are living on the edge at the moment,” Cr Krieg said.

Tweet from @Seqwater

In Queensland, a flood watch is current for already saturated catchments, with warnings for the Bokhara and Paroo rivers.

Seqwater warned of possible flood releases from the Wivenhoe, Somerset and North Pine dams on Monday and Tuesday.

The authority warned people downstream of the dams to avoid deep and fast-flowing water near floodplains and waterways.

South-east Queensland is also continuing to clean up after deadly foods triggered by the state’s wettest February in 130 years.

Weeks after the deluge, the Brisbane River has reopened to recreational boating after some 2000 tonnes of debris were removed from the river.

CityCat ferry services remain suspended and are not expected to resume until April, according to Brisbane City Council.

-with AAP