A tourist who was reportedly trapped in a car which washed off a causeway at the flooded Hugh River near Alice Springs has been found safe along with one other occupant, Northern Territory Police say.

Key points: The tourists' car was wedged up against a tree by floodwaters but then disappeared from view

The tourists' car was wedged up against a tree by floodwaters but then disappeared from view The two occupants have been found safe

The two occupants have been found safe Five adults and a baby missing for two days after leaving a remote WA community for the NT central desert

The occupants of the vehicle are being transported to Alice Springs Hospital for assessment, police said, adding they had only minor injuries.

Police earlier reported there was believed to be three people in the vehicle.

Acting Superintendent Brendan Muldoon said the small car began to float, before moving sideways and was then washed off the causeway.

Witness Mahim Satour said he saw the car attempt to cross the creek before it was swept away.

"On the shallow side it made its way through and as it got to the middle it started going left," he said.

"Once it hit directly in the middle it went straight off the edge of the road, it went tumbling over, underneath water, then it got stuck up a tree.

"The people that was in it, they never got out so we went back and rang up emergency services. As we came back we heard one bloke jumped out of the car nearly sitting down the tree somewhere down the river, and no one has ever seen that other person that was in the car."

A police officer at the scene where the causeway flooded. ( Supplied: Grenville Turner )

The car later disappeared from view, Acting Superintendent Muldoon said.

Emergency services were earlier trying to get a flood boat out to the creek to where the car was last seen.

Acting Superintendent Muldoon warned motorists not to cross floodwaters in the NT: "It's a very dangerous situation we have at the moment," he said.

He said there was no phone reception at the scene which was complicating the rescue operation.

A rescue operation is underway where a tourist remains missing after a car was swept away near Alice Springs. ( ABC News: Grenville Turner )

WA group of six including a baby still missing after two days

Meanwhile, five adults and a baby are still missing two days after they left the remote West Australian community of Kiwirrkurra on their way to the Northern Territory, as record rainfalls and flooding inundate the region.

Six people in two cars set out on Christmas Day to reach Kintore, about 180 kilometres away over the NT border, but never arrived and are believed to be bogged.

A ground search has so far been very difficult for police and emergency services due to flooded roads, with search parties from both the NT and WA sides of the border getting bogged and aborting the search, Acting Superintendent Muldoon said.

"Basically there's been about 100km of that section of road we haven't been able to search," he said.

Waterfalls run down Uluru after unusually heavy rain in Central Australia. ( Supplied: James Holding )

"The infant is with their parents. We don't know what food or water they have with them but there's plenty of water in that area due to the flooding," he said.

"We are concerned, obviously, and we're making efforts to ensure we can locate them as soon as possible."

Conditions eased allowing an aerial search on Tuesday afternoon which spotted the cars.

It was not known whether the travellers were with their cars and authorities said a helicopter would be sent to the site.

The group is not believed to have a satellite phone, and there is no phone reception in the area, which is very remote.

In Kintore community of about 400 people, situated about 520km west of Alice Springs, almost a quarter had to leave their homes to shelter in the school when floodwaters of up to a metre in height swamped the area.

Eighty-five people spent the night there, with another 11 finding accommodation with family, said said Pauline Vicary, acting superintendent for the Central Desert region.

"At the moment, with no rain out at Kintore, they're able to focus on the recovery phase of that incident, and we're hoping to get a number of houses deemed safe today (Tuesday) so residents can get back and start cleaning up and rehabilitating back into their homes," she said.

Sorry, this video has expired Wakeboarding in Central Australia

Several new rainfall records set

A number of records have been set over the past two days.

Yulara, the tourist village at Uluru, broke its December record, previously set in 1987, as well as its 24-hour rainfall record, with 84mm falling in one day.

"Yulara's had nearly 179mm, compared to 94mm last year for the entire year," said Sally Cutter, senior forecaster at the Bureau of Meteorology (BOM) NT.

A total of 128mm fell on Curtin Springs, beating its record for a 24-hour period of rainfall, previously set in 1982.

"The low came through Kimberley across the south-western parts of the NT, and it maintained its tropical nature as it came down through the interior of Western Australia," Ms Cutter said.

"When these tropical lows make landfall they can drop incredible amounts of water, and that's what we've seen down through the desert regions of Central Australia."

Uluru-Kata Tjuta National Park reopens

Yulara village near Uluru flooded on Boxing Day. ( Facebook )

The Uluru-Kata Tjuta National Park reopened to visitors on Tuesday morning, after closing on Monday morning due to flooding on the ring road around the rock and hazardous driving conditions.

"All roads are now open, but there is still water across the road in several areas, so please drive with care," Parks Australia said in a statement.

The Hewes family were holidaying at Uluru and had just completed the 10km base walk around the rock when the weather hit.

Travelling with their two sons and nephew, Lee and Bianca Hewes sheltered in a cave decorated with 30,000-year-old rock paintings at the Mutitjulu Waterhole on Christmas Day.

"The water was flowing straight off the rock, it was amazing, it was just a massive inundation," Mr Hewes said.

"We were lucky to see it, we were quite excited."

The town square flooded at Yulara, and firefighters had to pump the water out on Boxing Day.

Roads were also underwater as the Hewes family left the town on Monday, but the rain didn't dampen their spirits.

"I was psyched, I was really stoked to see it; I was actually kind of hoping for it to happen," Mr Hewes said.

Up to 30 stranded at Glen Helen Homestead Lodge

Uluru is drenched in heavy rain. ( Twitter: Bianca Hewes )

Up to 30 people remain stranded at Glen Helen Homestead Lodge, about 130km west of Alice Springs.

Homestead owner Shelagh O'Brien said the main road, Namatjira Drive, was impassable in at least two places.

"I guess you could say we're officially stranded, although we don't mind really; it's something that happens every so often," she said.

"Living out here you learn to be pretty self-reliant. We have a number of people staying at Glen Helen, some of whom would like to leave but can't."

She said the Finke River began to properly flow on Boxing Day, and there was more heavy rain overnight on Monday.

"It's very impressive," Ms O'Brien said.

Guests would be well cared for until it was safe to leave, she said.

"We've got a whole walk-in fridge and freezer full of food, they'll be absolutely well looked after; we've got a whole shelf of board games and puzzles and I'm sure they'll all come out," she said.

"People just love wandering along looking at the rushing water. It's so spectacular; every so often you see half a tree floating down the river."

Surfing at the flooded campgrounds of Curtin Springs in Central Australia ( Supplied: Curtin Springs )

Flooding fears for Hermannsburg and other communities

The Central Australian community of Hermmansburg, also known as N'taria, was on flood watch as river water continued to rise as a result of the ongoing heavy rain.

NT Police said communities south of Hermmansburg, including Areyonga, were now inaccessible after the Finke River Bridge was flooded with more than a metre of water.

Police are also discouraging people from driving from Alice Springs to Hermmansburg, as water is rising across Larapinta Drive.