The first east coast low (ECL) of the year could be forming off New South Wales, with the potential to bring more than 100 millimetres of rain to parts of the state.
Forecast models first identified the low-pressure system would form in the Tasman Sea on Tuesday, but be far enough offshore not to meet ECL criteria.
However, the latest indicators are predicting it could pass just close enough to the NSW coast to impact communities, with heavy rain expected tomorrow and Wednesday.