Bureau of Meteorology forecasters say a monsoon trough will develop tomorrow and extend across the Top End, with expectations a tropical low will form within it.
Senior forecaster Billy Lynch said a weak system sitting across the Territory coastline had already brought scattered and widespread showers and storms today.
"But more interestingly is tomorrow we're expecting some monsoonal winds from Indonesia to start to feed down on to the north coast," he said.
Mr Lynch explained this would likely develop into the first monsoon of the Northern Territory wet season, which runs from October until April.
"Initially it will be around the north-east Arnhem district where the monsoon will first be felt, but that is likely to extend right across the northern parts of the Top End during Friday and into the weekend," Mr Lynch said.
Mr Lynch said a tropical low was likely to form within the monsoon trough as it developed over the next few days.
Where will it go?
Mr Lynch said the tropical low — some of which develop into tropical cyclones — would move west "towards the Timor Sea and the Kimberley".
"For the Northern Territory, we're not really concerned over a tropical cyclone impact," he said.
"Obviously we are watching that very closely and there is a chance that low is going to move over the Kimberley and not be too much of a problem."
The Bureau of Meteorology announced earlier this year the weather would be affected by a La Nina cycle. They are direct correlated to an increased number of tropical cyclones and increased potential for heavy rain and high winds.
The last La Nina cycle lasted from 2010 to 2012, the second and third wettest years on record in Australia.
But the Bureau of Meteorology has predicted this year will be wetter and cooler than the previous two, with an increased chance of rain, flooding, cyclones and tropical lows.
