Residents in far north Queensland are bracing for more heavy rainfall today after ex-tropical Cyclone Nora.

Emergency services crews have received more than 100 callouts for help and went through 10 tonnes of sand during flash flooding in the Cairns and Port Douglas region.

Bureau of Meterorology (BOM) forecaster Harry Clarke says severe weather warnings for heavy rainfall were in place for the north tropical coast, Tablelands and the Gulf country with some areas to the north of Cairns recording more than 500 millimetres of rain in 24 hours.