The ex-tropical cyclone could then move north-west and approach the north Queensland coast on Thursday or Friday.
«It might bring some rain but that will be highly dependent on the movement of the ex-tropical cyclone,» Mr Knepp said.
«If it remains offshore, it remains more than likely none of that rain will make it to shore.»
Townsville residents are still reeling from a one-in-500-year flood disaster which inundated more than 3000 properties, while cattle farmers in the north-west are burying thousands of carcasses and thousands of kilometres of road remain closed or have restricted access.
Wind gusts of up to 98km/h were recorded at Cape Moreton on Moreton Island and 91km/h at Double Island Point, both about 3pm on Saturday.
Damaging wind gusts of more than 90km/h were expected on Saturday afternoon and night in exposed areas of the coast and islands between the Sunshine Coast and the New South Wales border.
A Gold Coast wave monitoring buoy recorded a maximum nine-metre wave about lunch time on Saturday.
There were dangerous surf conditions at exposed beaches on the Sunshine and Gold coasts on Saturday, with wild conditions expected to continue on Sunday before easing early on Monday morning.
The Bureau of Meteorology warned that dangerous surf conditions combined with abnormally high tides meant significant beach erosion could persist until early next week.
The water levels of the high tide may exceed the highest tide of the year across the south-east Queensland coast on Sunday.
All 34 beaches on the Gold Coast will remain closed on Sunday, while many beaches were also closed on the Sunshine Coast.
Surf Life Saving Queensland crews performed at least 16 rescues across the state on Saturday, with all patients swimming outside the flags – including some five kilometres away from the nearest flags.
Crowds of people also flocked to beaches on the coast to watch the massive waves smash into the beach.
Gold Coast mayor Tom Tate said Oma was still very unpredictable, and lifesavers had told people to get out of the surf after they ignored beach closed signs.
“Oma swell is bigger than that of [Tropical Cyclone] Debbie, the surf is still very dangerous as you can see out there and my attitude is that the warning has been issued, the beaches are closed, the sea wall at The Spit is closed,” he said.
“Anyone who jumps the fence, I spoke with the police, they can be prosecuted because they’re putting other people’s lives in danger if they get washed into the water, rescuers [have] got to go in there.”
Cr Tate said beach repairs should begin by Tuesday on the Gold Coast.
«I think, 48 hours, our beaches will be back as good as ever,» he said.
On Saturday, cars were flooded by waves at the Currumbin Surf Club car park.
The passenger ferry to North Stradbroke Island was cancelled for the remainder of the weekend, while the vehicle ferry was due to run two services on Saturday to clear the backlog of customers impacted by cancellations.
Felicity Caldwell is state political reporter at the Brisbane Times