A powerful meteorological system near Australia’s east coast has put tremendous rainfall over several days in New South Wales, putting Sydney in orbit for the rainiest year on record.

The torrent spurred a fourth widespread flood in less than 18 months in eastern New South Wales. The flood has triggered more than 100 evacuation orders.

Hundreds of people were rescued after Sydney was hit by a fourth flood within 18 months.

Since Friday, Sydney has observed 8.6 inches (220 mm) of rain, but the surrounding area is much more, some approaching 28 inches (700 mm). This is about the same amount that London observes annually.

According to the Australian weather information company WeatherZone, Sydney had four days of rain, the same amount that would normally be seen in a month and a half.

The city recorded about 70 inches (1,769 mm) of rain this year, jumping 7.5 inches past 1890, and the next rainy year will continue until July 4. 11th year on record.

In many parts of Sydney, about 8 inches (200 mm) of rain has been recorded in the past week.

Scientists attributed excessive rainfall to a combination of factors.

  • Existence of several natural climate drivers: The La Niña phenomenon, which is the regular cooling of the tropical Pacific Ocean, is associated with increased precipitation in eastern Australia. Regular cooling of the western Indian Ocean leading to La Niña is associated with increased precipitation in southern Australia. The positive Antarctic ring mode brings moist air from the Tasman Sea to eastern Australia by easterly winds, raining down.
  • Anthropogenic climate change that warms the atmosphere and oceans and intensifies precipitation events worldwide.

The Bureau of Meteorology also said that warm seawater helped to intensify rainfall.

“During this recent rainfall event, very warm water off the Australian coast (21-23 ° C) provides extra energy and moisture that contributes to deep valleys and low east coast, one 24. The period that brought about the relative concentration of heavy rains in time. “

The heaviest rains in New South Wales until Tuesday morning hit Brogers Creek, about 65 miles south of Sydney, recording 36.7 inches (933 mm). WeatherZone writes that such rainfall is only 1-2 percent more likely to occur in a particular year. Bloggers Creek has experienced more than just Melbourne, Canberra, Hobart, Adelaide and Perth in a month.

Darkes Forest, about 40 miles south of Sydney, rained 27.4 inches (697 mm).

Researchers say climate change is exacerbating the situation. Australia has warmed to about 2.6 degrees Celsius (1.5 degrees Celsius) since 1910. The warmed atmosphere retains more water and can increase the intensity of extreme weather events.

“Australia has long been a continent of drought and flood rain, but predictions show that climate change overestimates this variability,” researchers at the Australian National University and the ARC Center of Excellence for Climate Extremes. Chiara Holgate said in an email. “Observations show that Australia is increasing the intensity of heavy rain events, including short-term events that may be related to flash floods.”

Holgate said floods are one of the most costly disasters facing Australia, so Australia needs to be prepared for more severe floods. According to the Australian Insurance Council, the February and March floods in southeastern Queensland and New South Wales incurred approximately $ 3.35 billion in insurance losses, making it one of the most costly floods in Australia’s history. increase.

“Large floods are a threat to water supply and safe drinking water, straining the operation of water treatment plants by loading sediments and increasing potential pollutants,” said environmental scientist Klaus Klaus. Jonk said in a news release.

Researchers have discovered that climate change is exacerbating some recent flood events around the world. The World Weather Attribution Group found a record flood in May, evacuating at least 25,000 people and killing more than 130, but exacerbated by climate change. The group also found that global warming caused heavy rainfall in South Africa in April, killing more than 400 people, doubling the chances of it occurring, and increasing it by 4-8 percent.

Tuesday, Bureau of Meteorology, Australia Tweet The massive flood continued in parts of New South Wales, even if it was mitigated in Sydney. Over 20 warnings were active.

Until Wednesday, the heaviest additional rainfall is predicted primarily north of Sydney, and the European forecast model simulates additional rainfall of up to 1-3 inches (30-80 mm).

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