A dire warning has been issued to New South Wales communities, with the current floods inundating the north and west of the state dubbed just the beginning of a "very long" season.

Emergency Services Minister Steph Cooke said the current deluge is the start of a flooding season expected to stretch through spring and summer as flood-exhausted communities in the north and west of the state face renewed warnings.

"We're facing challenges on multiple fronts with prolonged flooding through the west and north-west of NSW, renewed river rises in the Central West and southern parts of NSW," she said.

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As warnings are constantly changing, you can keep up to date with warnings on the Bureau of Meteorology Website and NSW State Emergency Service Website

"Now communities in the Northern Rivers, Mid North Coast and North Coast who have been made flood weary over the past several months are facing an uncertain couple of days with weather conditions worsening.

"We are at the start of a very long season we expect, this is the third consecutive La Nina, and as we have seen all year our catchments and landscapes are highly saturated.

"This increases the risk of flash flooding and water coming up very very quickly and catching people unawares."

A number of flood warnings have already been issued for the state as a low-pressure trough bears down on NSW and southern Queensland.

Flash flooding forecast from Queensland to NSW Central Coast

Meteorologist Jane Golding said more than 100 millimetres have fallen on the NSW North Coast with more on the way. Inland NSW is expected to be inundated by floodwaters for days.

In the state's west, major flooding is expected at Wee Waa, Warren, and Euabalong which will continue for several days.

Some towns are already facing being cut off by rising floodwaters, like Calala, near Tamworth, where just one road in and out of the suburb remains.

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Further north, flash flooding is expected between the Queensland border to the Central Coast over the coming days.

The Northern Rivers may see flash flooding for the fourth time this year.

"We're expecting areas to see 24-hour totals of above 100mm but we're going to see some bullseyes in there that are higher than that, and those bullseyes are where we will see flash flooding," Golding said.

"That's enough rain to cause the rivers to start rising, roads ponding, and dangerous driving conditions. The ground is so saturated across all of NSW with the gusty winds around at the moment we can expect trees down as well."

The Mid North Coast is one of the key areas of concern. More than 100mm has fallen between Grafton to Coffs Harbour in the past 24 hours.

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Some parts of the Mid North Coast have even seen 180mm in the past 24 hours.

"Flooding is a key concern and is expected to be a key concern for several months," she said.

Golding said the rain is expected to stop late on Friday or Saturday, however the flood risk will remain.

Cars submerged and almost 50 flood rescues in NSW

Images have emerged of cars completely submerged in water in NSW's Mid North Coast and north-west as authorities plead with residents not to drive across flooded roads.

One of the images taken in Warren, north-west of Dubbo, showed the top of the car barely visible above water level.

"No this is not a submarine, it's a car floating away in flood water on the outskirts of Warren," the NSW State Emergency Service (SES) said.

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"The driver started to drive through the flood water when their car got pushed off the road and almost completely submerged.

"No matter how shallow the flood water looks, you never know how fast flowing it is or how quickly it can rise. It's not worth the risk, turn around and find another route."

NSW SES Commissioner Carlene York said there have been 49 rescues during the flood event and more than 500 calls for help.

"It is important if people see water across the road they do not drive into the floodwaters and find an alternate route," she said.

As part of one of these flood rescues, emergency services had to use a boat to rescue a man trapped by floodwater in Boggabri, also in NSW's north-west.

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Police said the man's vehicle became submerged approximately 5km east of the Kamilaroi Highway around noon yesterday.

Authorities tried to reach the 22-year-old man but said they were "unable to get to the location due to the flood levels", forcing SES crews to take to the roads in a boat. 

"A short time later, the man was rescued from the roof of his vehicle," police said in a statement.

"The man was uninjured and did not require medical treatment."

The man was issued with an infringement notice for the offence of disobey road access sign, which carries a $283 fine and two demerit points.