The threat to the Northern Territory from Cyclone Trevor was predicted to shift from destructive winds to flash flooding on Sunday, as residents in Western Australia's far north braced for unsafe storm surges caused by Cyclone Veronica. But two large storms such as Trevor and Veronica hitting on the same weekend is rare.
A Flood Watch has been issued for Carpentaria Coastal Rivers and the Barkly.
"While the cyclone may weaken before reaching the coast, a severe coastal impact is likely".
He said Groote Eylandt was expected to feel some effects of the cyclone including destructive winds, heavy rainfall and abnormally high tides.
"So we can see some localised flash flooding - roads being cut, communities being isolated. The cyclone is still intensifying and there's a real risk of storm surge".
The system is expected to come within 100km of Tennant Creek on Sunday afternoon before moving south-east towards the Queensland border in coming days.
Legendre Island reported a wind gust of 157km/h on Sunday morning before the storm.
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Thousands of people were evacuated from small communities on the NT's coast by the Australian Defence Force (ADF) on Thursday and flown to Darwin, the NT's capital city as Tropical Cyclone Trevor bears down on the region, according to The Australian. "The system is forecast to generally track in a southerly direction towards the Pilbara coast and is now expected to make landfall between Karratha and Port Hedland on Sunday", it said.
Residents have been urged to stay indoors in the strongest and safest part of their homes.
Bureau of Meteorology senior forecaster James Ashley said Veronica was unique because of its slow speed, which would bring a long danger period.
The slow movement of the cyclone means that communities in its path should prepare to shelter from the destructive winds for an extended period on Sunday and Monday. At the time of landfall it was a category 4 storm, with 5 being the strongest.
The last category four tropical cyclone to hit the WA coast was Christine in December 2013.
In the west of Trevor, Cyclone Veronica has also started gaining momentum since Wednesday.