The weather bureau says flooding rain and gale-force winds are expected to hit the Sunshine Coast for the next three days.
The bureau's Brett Harrison says conditions will deteriorate this afternoon and there could be wind gusts of more than 120 kilometres per hour by tomorrow.
More than 400 millimetres of rain could fall on some parts of the coast during the weekend and Mr Harrison says low-lying areas may flood.
"So Saturday there will be powerful surf obviously but Sunday it looks like it'll be at its peak and certainly around the high tide we do expect the water to get right up to the coastal edge and [it] could exceed the highest tide of the year," he said.
"So it is something for coastal people to be careful of and stay well away from the water."
Sunshine Coast disaster coordinator Alan Rogers is asking people in low-lying areas to prepare their homes for possible flooding.
Mr Rogers says they should ensure they have plenty of sandbags if needed to restrict flooding.
He says tourists should reconsider their travel plans.
"If people ... are finishing up their holiday ... and wanting to travel we'd ask them to possibly bring that travel forward ... Sunday morning is a time when there is a bit of change over and we're asking people [not] to go anywhere near flooded roads," he said.
Emergency Management Queensland says Sunshine Coast residents should do all they can to prepare themselves and their homes.
Area director Andrew Wyatt says says residents can take preventative measures to ease the pressure on State Emergency Service (SES) volunteers.
"If you've had or required assistance from the SES in the past and they've been to your property, start thinking about things you can do for yourself," he said.
"You can go to most of your hardware stores these days and purchase sandbags, you could actually fill those and have those at home ready to deploy should you need them and that'll just take a little bit of pressure off the volunteers."
© ABC 2013
12:26 EDT Thunderstorms have rolled through Melbourne this morning bringing heavy rain, and are set to become more widespread this afternoon.