Parts of Queensland hit-hard by ex-tropical cyclone Oswald are bracing for another severe weather event.

Heavy rain with the chance of flash flooding has been forecast as a low pressure system develops off the Queensland coast.

It is expected to linger until Thursday, also producing strong wind and dangerous surf.

Weather bureau senior forecaster Ben Annells says falls of 100 to 200 millimetres are likely between Bowen in the state's north and Brisbane.

"The rain at this stage looks as though it's going to be at its heaviest later today and tonight and at least the first half of tomorrow," he said.

More than 200 millimetres of rain has already fallen at Doonan and Coolum on Queensland's Sunshine Coast in the past 48 hours.

There has been close to 100 millimetres since yesterday morning on Hamilton Island and 76 millimetres at Mackay.

Mr Annells says strong winds and dangerous surf are also expected.

"As it moves southwards it is going to deepen quite significantly,"

"It's pretty much going to stay there at least for a couple of days probably at least until Thursday and then it may start to move south or south-west."

 

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