Public transport services in Darwin have been suspended as the Top End braces for a potential cyclone.
Darwin bus services will stop at midday on Sunday, with a tropical low expected to form a cyclone sometime in the afternoon.
Rough seas have forced Sealink NT to suspend ferries travelling to Mandorah and the Tiwi Islands for the remainder of the day.
Police are urging residents to avoid driving if possible, with several waterways including Rapid Creek, Adelaide River and areas near Dundee Beach at risk of flooding.
"If floodwaters are encroaching onto roads, do not attempt to cross them," regional controller commander Brent Warren said.
"We also ask boaters to stay off the water in these rough conditions."
Darwin Airport is operating as normal but travellers are advised to check directly with airlines before flying.
Nightcliff Jetty on the city's foreshore is also closed.
