La Nina declared by the Bureau of Meteorology | The times of Inverell



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The main climatic factors have synchronized sufficiently for the Bureau of Meteorology to officially declare a La Nina weather event. The BOM said today that the Pacific Ocean is in a phase of La Nina. Historically, La Nina events have correlated with wetter than average conditions in many parts of Australia, particularly in the eastern, northern and central regions. La Nina is part of a cycle known as El Nino-Southern Oscillation (ENSO), a natural change in ocean temperatures and weather conditions along the equator in the Pacific Ocean. BOM Operational Climate Services Chief Andrew Watkins said during La Nina, the waters of the central or eastern tropical Pacific become colder than normal, with persistent southeast-northwest winds strengthening in the Tropical and equatorial Pacific, and clouds are moving west, closer to Australia, causing increased rainfall on the continent. Dr Watkins said the La Nina event correlated with the likelihood of a wetter-than-average rainy season in areas of the country with predominant summer rainfall. He said much of the nation could expect a cooler and wetter summer following the event. “La Nina increases the risk of cooler-than-average daytime temperatures for much of Australia and may increase the number of tropical cyclones forming,” said Dr Watkins. IN OTHER NEWS: He said the phenomenon was playing a role in the heavy November rain that is currently hitting much of eastern Australia and parts of South Africa. However, La Nina is not the only climatic factor playing a role in the tropical humidity that flows through the country. Christa Pudmenzky, a climate science lecturer at the University of South Queensland, said the Madden Julian Oscillation (MJO), which is a climatic factor that travels around the world, is also conducive to increased rainfall. over Australia. Unlike ENSO, the MJO is not fixed and moves with phases lasting 30 to 60 days. Dr Watkins said this year’s La Nina will be the second year in a row we’ve attended the event. “La Nina also performed in the spring and summer of 2020-2021,” he said. “The back-to-back events of La Nina are not unusual, with about half of all past events returning for a second year.” In terms of predicted strength, Dr Watkins said this year’s event is unlikely to be as strong as the 2010-12 event and may even be weaker than the La Nina 2020-21 event. However, he said that didn’t mean it wouldn’t be as wet as last year, saying other factors had influenced the weather in the short term. “Each La Nina has different impacts, as it is not the only climatic factor affecting Australia at some point,” he said. “That’s why it’s important not to look at it in isolation and to use the Office’s online climate forecasting tools to get a sense of the likely conditions for the coming months,” Dr Watkins said. He said La Nina is likely to persist until at least the end of January 2022.




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