A low pressure trough with an embedded tropical low stretches across the Top End, bringing a broad area of thick cloud and extensive storm activity to the country's tropical north. A heat low and trough through northern inland parts of Western Australia brings similarly thick cloud cover and thunderstorm activity to the Pilbara region, as well as a broader sheet of patchy mid level cloud to the region. Thick low level cloud sweeps over much of the New South Wales coast and up into southeast Queensland, the result of moist onshore flow and an upper disturbance. An upper level disturbance is causing a mid to upper level cloud band to drift over the southeast coast of South Australia A high pressure system southeast of Tasmania drives a thick sheet of low level cloud over much of Tasmania, along with the southeastern corner of the mainland. The rest of the country is mostly cloud free.