EX-cyclone Grant could reintensify in the Coral Sea after crossing the Far North Queensland coast later this week, meteorologists say.

Early weather models have the storm system moving into the Gulf of Carpentaria and over Cape York tomorrow and on Thursday, bringing between 25mm and 50mm of rain to the region, including Cairns.

Once moving into the Coral Sea the system could turn into a cyclone again, but Weather Channel meteorologist Felim Hanniisy said it was too soon to tell how likely that was until its reaction to warmer water could be gauged.

"Some of the models have suggested a possible reintensification," he said.

"Things will become much clearer over the next couple of days.

"It is going to be one to watch especially on Wednesday, when it emerges and moves into the Gulf of Carpentaria."

Mr Hanniisy said the system was "mobile" and likely to move on quickly.

He said the main effect on the Far North would be heavy rainfall of 25mm to 50mm, including localised heavy falls.

"That will be across much of the North and much of Cape York Peninsula," he said.

Cyclone Grant crossed east of Darwin overnight Sunday, causing minimal damage, and was expected to be downgraded below cyclone intensity last night.

Assistant director of weather services with the weather bureau, Alasdair Hainsworth said small communities experienced the full force of the category 2 storm.

Heavy rain yesterday caused minor flooding in the Northern Territory tourist and mining town of Jabiru, and to the north, torrential downpours cut off Croker Island residents from their airstrip and cut power supplies.

NT Police Supt Colin Smith said emergency crews were more concerned about localised flooding as the ex-cyclone moved towards Queensland.

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