WINDSOR, AUSTRALIA (NYTIMES) – Ms Kelly Miller stood in her doorway on Monday (March 22), watching the water rise to within a few inches of the century-old home where she runs an alternative medicine business. The bridge nearby had already gone under in some of Australia’s worst flooding in decades, along with an abandoned car in the parking lot.

“It’s coming up really quickly,” she said.

This week, two massive storms converged over eastern Australia, dumping about a metre of rain in just five days in some places.

In a country that suffered the worst wildfires in its recorded history just a year ago, the deluge has become another record-breaker – a once-in-50-years event, or possibly 100, depending on the rain that is expected to continue through Tuesday night (March 23).

Nearly 20,000 Australians have been forced to evacuate, and more than 150 schools have been closed. The storms have swept away the home of a couple on their wedding day, prompted at least 500 rescues and drowned roads from Sydney up into the state of Queensland 800km north.

Mr Shane Fitzsimmons, the resilience commissioner for New South Wales – a new state position formed after last year’s fires – described the event as another compounding disaster. Last year, huge fires combined into history-making infernos that scorched an area larger than many European countries. This year, thunderstorms have fused and hovered, delivering enough water to push rivers like the Hawkesbury to their highest levels since the 1960s.

Scientists note that both forms of catastrophe represent Australia’s new normal. The country is one of many seeing a pattern of intensification – more extreme hot days and heatwaves, as well as more extreme rainfalls over short periods.

It is all tied to a warming earth, caused by greenhouse gases. Because global temperatures have risen 1.1 deg C over pre-industrial levels, landscapes dry out more quickly, producing severe droughts, even as more water vapour rises into the atmosphere, increasing the likelihood of extreme downpours.

“There is a very strong link between global warming and that intensification in rainfall,” said Mr Andy Pitman, director of the ARC Center of Excellence for Climate Extremes at the University of New South Wales. “There’s good scientific evidence to say extreme rain is becoming more extreme due to global warming.”

Australia’s conservative government – heavily resistant to aggressive action on climate change that might threaten the country’s fossil fuel industry – has yet to make that link.

Prime Minister Scott Morrison has offered funds for those forced to flee and several dozen areas have already been declared disaster zones.

“It’s another testing time for our country,” he told a Sydney radio station, 2GB, on Monday.

Windsor may become one of the places hardest hit. Over the weekend, the Hawkesbury rose rapidly by more than 9m, and it is expected to peak in the next day or so at 12.7m.

With rain continuing to fall, emergency workers wearing bright orange went door to door on side streets with waist-deep puddles where the road dipped.

In and around the historic downtown, many of the businesses close to the river stayed shut on Monday, with a few putting sandbags by their doors. The central meeting place seemed to be at the foot of the Windsor Bridge, where television crews and crowds in rubber boots marvelled at the view.

The new Windsor Bridge, which opened just a few months ago as a “flood-proof” replacement for an older bridge, was completely underwater.

It was built 3m higher than the bridge it replaced, but the river flowed over it as if it did not exist. A red flashing light on the top of a buried yellow excavator offered the only hint of the old bridge, or what had once been solid ground.

Mr Cameron Gooch, 46, a diesel mechanic from a town nearby, said he saw huge trees speeding downriver toward the coast a day earlier. The water seemed to have slowed down, he said, becoming a giant bathtub with water held in place and rising slowly from tributaries.

“That’s the problem,” he said. “It’s just going to keep building up.”

Nearby, Ms Rebecca Turnbull, curator of Howe House, a home and museum built in 1820, put handwritten notes on the furniture that would need to be removed if the water surged even more.

She pointed to a line drawn on the doorway of a room that smelled of damp old wood.

“This is where the water came up to in 1867,” she said.

Like many others in Windsor, she said she doubted the river would reach quite that high this time around. But that did not bring much solace to those closer to the rising brown sludge.

Ms Rachael Goldsworthy, who owns a home and real estate business just behind Miller’s naturopathic clinic – it is a little higher on the hillside – said she saw a new Mercedes car washed downstream the night before after a man had parked in a small puddle and then went into a grocery store to buy a roast chicken. In just minutes, the rising water carried the car away.

On Monday, she tried to help Ms Miller find a few milk crates – the only defence for some of the heavy furniture that could not be moved out.

Inside, Ms Miller and her son collected oils and other products that she would normally be selling, with plans to put them in a truck or a storage unit. The antique flowered carpet was still dry, and she’d taped up the toilets to keep the septic system from backing up into the house.

She said she did not have flood insurance because she could not afford it. So all she could do was learn from YouTube videos about how to fight a flood.

“We’re trying to work out how to save what we can,” she said. “We don’t want to lose everything.”

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