It is expected that with 120km/h winds, waves at coastal beaches could be higher than 5 metres, when the cyclone hits South Queensland on Friday.
The eye of the cyclone remains out at sea where winds are blowing at about 150 km/h, but the strength of Oma is still increasing.
"The system is moving back towards eastern Australia".
Communication is down in most parts of Santo, and Red Cross team leader John Boar said the bad weather had made it hard for assessment teams to go out.
A driver was caught out taking on the big swell at Rainbow Beach, north of the Sunshine Coast, on Tuesday and was forced to abandon his ute, leaving it at the mercy of the pounding waves. But a number of other global meteorological associations have made a punt it will change direction as it heads towards Australia, which mean it could avoid landfall.
The east side of the South Island and lower North Island were looking to see the worst weather, Mr Noll said.
"But we can not rule out a coastal crossing this weekend and if that happens it means heavy rain for the southern Queensland coast and Brisbane".
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Mr Stoney said while the bureau was expecting the cyclone to remain offshore its effects would still be felt.
Boaters should take extra care on the water and ensure they have appropriate safety equipment.
Gold Coast lifeguards closed several beaches along the Surfers Paradise stretch and further south due to strong currents, and have urged people not to enter the water.
The category two Cyclone Oma has been on the move for the last week and is now circling towards Vanuatu, but the effects of the strong winds and rough waters could be felt in Queensland.
GFS - Showing the remnants of Oma well and truly becoming extra-tropical - in otherwords, forming a new large low in the NZ area.
What is known is that some type of new low will form around the New Zealand area this weekend but with so much chaos we can't be specific about how much rain will fall, where and when as of today.