'There still are a wide range of scenarios at this point, ' the Bureau of Meteorology's Bruce Gunn said. How said residents of the affected areas could expected "very heavy rainfall, gale force winds and storm surges" and these conditions, along with abnormally high tides, could cause flooding.
Oma was a weak category two storm early on Thursday, sitting about 950km northeast off Brisbane and is moving slowly towards the coast at around 10km/h.
Oma's motion becomes slow moving during Saturday but is then expected to track in a more north or north-west direction, remaining offshore through the weekend.
The Bureau of Meteorology says as Oma makes her turn - which will take more than 24 hours for her to complete - her effects will continue to be felt on the Gold Coast.
He said for Nelson to get rain, it needed a strong northerly.
In a statement online, the Bureau of Meteorology said: "Abnormally high tides and risky surf conditions are expected along the southern Queensland coast over the next few days and into early next week".
"This has the potential to be a significant beach erosion event given the combination of the large surf, abnormally high tides and the fact that these conditions should persist for a few days", the weather bureau said late on Friday.
Tom Tate, the Mayor of Gold Coast, believes the strong winds will cause the most damage.
Beaches from Tweed Heads to Port Macquarie have been closed and are expected to remain closed until early next week.
After that, its behaviour is less predictable. Gale force winds are also possible about elevated terrain near the New South Wales border during Friday.
"We are starting to see the main swell packet from Oma starting to arrive on the south coast of Queensland now", Hall told the ABC.
However, respected models used in the U.S. and Europe now show an increasing likelihood of the cyclone making landfall in Queensland.
A severe weather warning is in place for Queensland's east coast from the town of Seventeen Seventy to the NSW border.
The water levels of the high tide may exceed the highest tide of the year across the south-east Queensland coast on Sunday.
Despite repeated warnings of hazardous surf conditions across Queensland, the monster waves have proved too tempting for some surfers.
A FLOOD watch warning is now in place for the Mary and Burrum rivers.
While it is unusual for a cyclone to track this far south, it is not unprecedented.
Cyclone Nancy, the last storm to directly impact Brisbane, did not make landfall.
A Gold Coast wave monitoring buoy recorded a maximum nine-metre wave about lunch time on Saturday.