Tropical cyclone Nathan has made landfall in the Northern Territory as gale force winds lash the Arnhem Land coast.
The cyclone, which has intensified to a "high end" category 2, has started moving off the coast and onto land south of Nhulunbuy.
Gale force winds of up to 155km/h are expected to smash through Goulburn Island to Groote Eylandt, including Nhulunbuy and Gapuwiyak.
Bureau of Meteorology senior forecaster Adam Morgan says the cyclone's eye is about 20km offshore.
Coastal residents between Groote Eylandt and Nhulunbuy have been warned of a dangerous storm tide with damaging waves and dangerous flooding.