Emergency services are trying to locate and rescue seven people in the NT who have been swept away or are unaccounted for in the NT after heavy rain.
Brendan Muldoon, duty superintendent with NT Police, has confirmed to SBS a tourist was trapped in a vehicle in Araluen, south of Alice Springs, having been swept away due to flooding.
It is believed to be a Japanese tourist, although the identity hasn't been confirmed. Two others were able to get out of the vehicle.
In a press conference, the superintendent said the car the tourist was travelling in has disappeared and he holds grave concerns for the person inside.
He urged others "not to cross flooded causeways, not enter flooded rivers".
"The southern part of the Northern Territory is experiencing extreme weather from the tropical low that has come across from Western Australia - we're just urging all tourists, all motorists in the area, to not enter flooded causeways."
He said as the vehicle tried to cross Hugh Creek, it was washed sideways and off the causeway - around 250m away.
Emergency services and a flood boat were sent to the scene.
Six others, including an infant, are also missing in the territory's far west, after they did not arrive at their NT destination after leaving the Kiwirrkurra in Western Australia. They were travelling in two cars.
The flash flooding swept the outback, forcing evacuations and the Uluru national park to close on Boxing Day.
The park has reopened Tuesday after record-breaking rain.
The Walungurru district recorded 232mm of rain in 24 hours, cutting off roads and washing out walking tracks.
Park Manager Mike Misso said rangers had been out assessing damage from the deluge since 5.30am on Tuesday.
"We're doing some works today to secure some of the more popular walks, so the park's definitely open but there will be some areas that remain closed due to heavy erosions on the walking tracks," Mr Misso said.
All vehicle tracks in the park have also reopened.
Mr Misso said the rainfall event wasn't entirely unexpected, as summer is technically the wet season even in the country's arid centre.
However the extent of the event had caught even locals by surprise.
"Speaking to some of the rangers who've been here a long time they haven't seen rain like this for several years," Mr Misso said.
There was 61.4mm of rain in one hour on Christmas night alone, which the Bureau of Meteorology described as a one-in-50-year rainfall event.
An extreme weather event dumping heavy rain across the Northern Territory has forced the closure of Uluru National Park.
Twenty-five houses in the community of Kintore were flooded and dozens were evacuated at the height of the flooding.
The town square of Yulara was flooded and had to be pumped out by the local fire service.
Mr Misso said the upside was the inundation would provide Uluru visitors with spectacular views.
"The desert landscape is like a sponge, it sucks up the water very rapidly," he said.
"What we'll see over the next few weeks and months is an explosion of rich vegetation. The desert will bloom."
