A Cyclone Advice is still in place for people in or near the coastal communities of Broome to Whim Creek.
This includes people in or near Port Hedland, Wallal and Broome.
The Department of Fire and Emergency Services says although there is no immediate danger people need to start preparing for dangerous weather and keep up to date.
A tropical low is estimated to be 380 kilometres north of Port Hedland and 435 kilometres west northwest of Broome and moving south at seven kilometres an hour.
The low is likely to develop into a tropical cyclone late on Sunday or early on Monday as it tracks towards the coast.
It is not expected to cause gales in coastal areas during Sunday but gales may commence on Monday.
During Monday the system will continue to intensify and there is a high risk that it will cross the coast as a severe tropical cyclone on Tuesday or Wednesday.
People in the Pilbara and Kimberley are advised to stay up to date with weather forecasts and warnings.
Widespread very heavy rainfall is expected during Tuesday and Wednesday and is likely to lead to major flooding in the De Grey catchment.
Significant flooding in the Fortescue is also likely.
© ABC 2013
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