Residents across North Queensland are being warned to prepare for a dumping of rain up to 300mm in coming days and the chance of a tropical cyclone developing.The Bureau of Meteorology is forecasting falls of between 50mm to 100mm between Cooktown and Townsville from tomorrow.But some isolated areas could record falls of 200mm to 300mm.READ MORE: Town soaked by a year's worth of rain as deluge lashes stateLarge parts of Queensland are forecast to be blanketed by the low pressure