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Australia How the La Nina weather event could affect Australia for the rest of 2020

11:02  30 september  2020
11:02  30 september  2020 Source:   abc.net.au

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The weather event , which mainly affects Australia 's north and east, could also boost wheat yields. This month, Australia raised its wheat production More wet weather for the rest of the year could also mean a less severe bushfire season this summer but spring rainfall that is above average can

La Nina weather patterns turn to bring cooler temperatures in the Pacific Ocean. ' La Niña typically results in above-average spring rainfall for Australia , particularly across eastern, central and It can also mean cooler days, more tropical cyclones, and an earlier onset of the first rains of the wet season

a close up of a colorful background: La Nina systems increase the risk of cyclones like ex-Tropical Cyclone Owen. (Supplied: Bureau of Meteorology) © Provided by ABC NEWS La Nina systems increase the risk of cyclones like ex-Tropical Cyclone Owen. (Supplied: Bureau of Meteorology)

A La Nina weather pattern could finally put an end to the drought in parts of Australia, but for some it has raised concerns about potential cyclones and flooding.

The last La Nina event stretched from 2010 to 2012 and resulted in one of Australia's wettest two-year periods, but conditions this year are forecast to be less extreme.

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" La Nina basically means, for Australia , an increased risk of rainfall — particularly in central, eastern and northern "Historically, roughly half the La Nina events saw some degree of flooding," Dr Watkins said. Since then, there have been no significant negative IOD or La Nina events , except for a weak

What is La Nina and how does it affect you? A La Nina generally means above average rain for northern and eastern Australia for the second half of the year, often spreading far inland. The effect of 2020 ’s la nina . One thing to note is that this could be a weak La Nina .

Bureau of Meteorology senior forecaster Lauren Pattie said while flooding and cyclones were associated with La Nina, it was too early to predict the severity of the weather pattern.

"Each one is different, but the last significant La Nina we saw, we saw very intense flooding," Ms Pattie said.

"We aren't expecting to see it as strong, however we do expect to see an above average rainfall, which does mean there's an increased risk of flooding."

Ms Pattie said cyclones and an early monsoon for north Queensland were also associated with the weather pattern.

"The average number of cyclones for the Queensland region is four," she said.

"But regardless of the number, it only takes one cyclone to make a season."

National impact

Bureau of Meteorology manager of climate operations Andrew Watkins said south-eastern Australia could expect more rainfall during spring and into summer.

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Search for a location. How La Niña could impact world weather . 29th September 2020 Last updated at 10:53. Please turn on JavaScript. Meteorologists have declared there is a La Niña event in the tropical Pacific. But what does that mean for the world's weather ?

"Some of the deferrals could be people who are underemployed rather than unemployed … people trying to take the nervousness out of their Cyclones, floods and flames — how La Nina could affect us for the rest of 2020 . Posted 37mminutes agoWedWednesday 30 SepSeptember 2020 at 5:07am.

While that would lead to more water in reservoirs, he said, it also brought an increased risk of flooding.

The other side of the country was likely to feel the effects later in the year, he said.

"In south-western Australia we don't typically see a big impact from La Nina during the spring," Dr Watkins said.

"But sometimes in summer we do see some tropical cyclones driving down from the north-west and affecting the south coast."

Dr Watkins said the north-west could expect six to seven tropical cyclones each year, and the La Nina increased the likelihood of getting at least this many, if not more, along with an earlier monsoon.

He said the bushfire season, which occurs every summer in southern Australia, should be milder during La Nina.

"A bit of extra rainfall will keep those fires a little smaller, a little shorter than we have seen in recent years," he said.

No 'magic tap'

Despite his memories of the last La Nina, the prospect of more rain has been welcomed by Greg Hutchinson, who farms cotton in the drought-declared shire of Banana, near Rockhampton.

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Search for a location. How La Niña could impact world weather . 11th September 2020 Last updated at 16:30. Please turn on JavaScript. As cool waters well up in the tropical Pacific, what will this mean for the weather around the globe? BBC Weather 's Chris Fawkes looks at the weather pattern known as

"It was devastating for us and a lot of irrigators along the Dawson River, because two years in a row people got their cotton crops flooded out, so they had no income for those two years," he said.

"We definitely don't want what happened in 2010-2011 but probably something in between would be nice."

Rick Britton, the Mayor of outback Queensland's Boulia Shire, was optimistic the forecast would eventuate.

"It's the same type of prediction now [that there was] in 1973, 1974 and 2000, and those years were our wettest years on record," Cr Britton said.

"That prediction would be really good for the majority of Australia.

"I've noticed in the last five or six weeks here we've had prominently north, north-west winds, and to me that's a sign that there is something in the wind, and we've just got to sit and wait to get a wet [season]."

Agriculture Victoria seasonal agronomist Dale Grey said farmers had been looking out for the La Nina for months.

"Just because the [Bureau of Meteorology] declares a La Nina doesn't mean the tap suddenly, magically turns on," he said.

BOM declares a La Nina, signalling wet spring and summer likely for northern, eastern Australia

  BOM declares a La Nina, signalling wet spring and summer likely for northern, eastern Australia The last major La Nina events were in the summers of 2010-11 and 2011-12 — it was Australia's wettest two-year period on record. Will this year be as bad? Are we going to see more cyclones?La Nina is a phase of the El Nino Southern Oscillation (ENSO), which describes ocean and atmospheric circulations over the Pacific Ocean.

Chances for La Niña decrease to 55% for the December-February 2020 /2021 period. National Meteorological and Hydrological Services will closely Model predictions and expert assessment indicate that the probability for La Niña development during September-November 2020 is about 60

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"We've been waiting for the tap to turn on for some time in the north of the state, and we've just had average to drier rainfall.

"There would be plenty of crops that would really benefit from a wet October."

Crushing blow?

In the meantime, Australia's sugar millers are concerned the weather pattern could threaten the remainder of the 2020 crush.

One third of an estimated 30.9 tonnes of sugarcane is yet to be harvested and processed, and rain could disrupt the final weeks of the season.

"La Nina-influenced light rain will be manageable and welcome," the Australian Sugar Milling Council's Jim Crane said.

"But heavier falls could be challenging towards the end of the crush.

"[But] spring rain can set the foundation for an improved 2021 crop across most of the cane growing regions."


Video: North and east of Australia in for a wet spring, summer (ABC NEWS)

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