The weather bureau has warned south-east Queensland residents to expect more wild weather just days after severe thunderstorms ripped through the Sunshine Coast hinterland.

A severe warning for heavy rain has been issued for coastal areas from Fraser Island through to the Gold Coast and as far inland as Kingaroy, Toowoomba and Warwick.

Weather bureau senior forecaster Jonty Hall says the downpours could cause flash flooding.

"The heaviest falls are likely to be in the 100 to 150 millimetre range - one or two falls could come in as high as 200 millimetres as well," he said.

"Parts of the Sunshine Coast in particular have had a far bit of rain in the last couple of days, so this in addition to that, could produce some flash flooding problems around there in particular.

"Even elsewhere in that warning zone we could see rainfall heavy enough to produce some flash flooding."

Emergency Management Queensland (EMQ) spokesman Andrew Wyatt says people need to heed warnings about the dangers of flash flooding.

"When the ground catchment's so saturated, water can rise extremely quickly, it can flow very quickly," he said.

"Just simply walking or driving through that, there's a very real possibility that people can be swept away and we have another tragedy on our hands.

"We've had instances recently where people have been washed away in as little as 400 millimetres of water, due to the power that can be generated."

Mr Wyatt says residents in flood-prone areas need to prepare.

"Two-hundred millimetres normally is not too much of a concern to us, but currently with the amount of rain that we've had over the past few days and over the past couple of weeks, our river systems and streams are certainly flowing and primed - is a good way of putting it," he said.