A low pressure trough stretches across the country from southwestern Western Australia, through the Northern Territory and Queensland, into northern New South Wales. Extensive thunderstorm activity surrounds the trough. Low cloud covers streams off the coast of eastern Victoria and eastern New South Wales in the southerly airstream behind a coastal trough which stretches into the Tasman Sea. An upper disturbance and a surface trough in the vicinity is driving a band of thunderstorm activity and associated upper cloud over western South Australia and the southern Northern Territory . Rainfall from the system has developed low level cloud over southern Western Australia. A cold front lies over the northeast of Tasmania. To the south and west of the cold front patchy cloud streams over Tasmania and Victoria in the cold southwesterly airstream.