Cyclone Oma's Coastal Hazards Increase Dangerous Surf Conditions

Upgraded to a Category 2 system on Saturday, people in southeast QLD and northeast NSW are being warned to "stay out of the water."

Situated over the southern Coral Sea -- about 700 kilometres east of Brisbane -- Cyclone Oma is now an extratropical system and is predicted to head north.

Dangerous surf conditions in key locations like Sunshine Coast and Gold Coast will continue over the weekend, according to 10's weather expert Josh Holt.

Water levels on the high tide are likely to continue to exceed the highest tide of the year around the southeast Queensland coast over the next few days.

Loose Surfers Riding Swell Created By Cyclone Oma

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This has the potential to be a significant beach erosion event given the combination of the large surf, abnormally high tides and persisting conditions.

Damaging wind gusts in excess of 90 kilometres per hour are likely about the exposed coast and islands between Sandy Cape and the QLD/NSW border.

These gusts may extend to the southern border ranges -- inland to about Springbrook and Tamborine Mountain -- over the weekend.

Locations which may be affected include Gold Coast, Maroochydore, Moreton Island, North Stradbroke Island, Noosa Heads, Caloundra, Rainbow Beach, Fraser Island, Tamborine Mountain and Springbrook.

Maximum offshore wave heights of 12-13m were recorded at Mooloolaba and off Point Lookout, and are larger than those recorded in Cyclone Oswald.