There is a "high chance" of rain for Katherine for later this week.
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The Bureau of Meteorology has upgraded its forecast potential for rain across the Top End with changing weather conditions caused by the first monsoon trough of the wet season.
Some weather websites are predicting high falls for Katherine from Friday.
And get this, maximum temperatures are expected to fall dramatically with the arrival of the rain with highs of 32 degrees predicted for the weekend.
The bureau's automated river monitors show the big rains across Nitmiluk over the past few days caused barely a blip in the flows for the Katherine River still waiting for the long delayed wet season.
The town only received just over half its annual average rainfall last year.
The first cyclone of the season is likely to develop off the northwest coast of Australia early this week as a tropical low gains strength.
But it will be a second low pressure system to develop over Darwin later in the week which is expected to influence Katherine's weather.
The developing cyclone is forecast to bring heavy rainfall over the west Kimberley and is likely to extend into the eastern Pilbara during Tuesday and Wednesday.
Today it remains as a developing low and has not yet formed into a cyclone but could do so tonight or tomorrow. Should this system develop into a tropical cyclone it will be named Tropical Cyclone Blake.
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