Parts of Far North Queensland are back on flood-watch as the ex-tropical cyclone Nora trails her way across Queensland from the Gulf of Carpentaria.

In Cairns, more than 40 people were evacuated from a caravan park were calls for help to emergency services started at midnight, including one family with a small child who smashed the back of their campervan to escape rising waters.

Catchments and river systems in the area are already at high-levels from previous flooding in the year.