The twelve strongest La Niña years which had The average Southern Oscillation Index (SOI) values across the three month period for each of these La Niña years are shown in the table. For each of the twelve years, the rainfall percentiles for the summer period were calculated against all years between 1900 and 2014. Australia & New Zealand: La Niña Driving Weather Patterns Through Summer 2020 19th August 2020 An unusual weather pattern has been affecting southern Oceania for a few weeks now. "When that couples with the atmosphere, we start to see some global impacts, including those in Australia." Typical impacts on Australia’s climate during a La Niña include rainfall increases in Most notable is the much broader impact across northern and central Australia. We use cookies on our website (including third party cookies) to analyse traffic, share information with analytics partners and provide you with the best experience possible. The impact of La Niña could further tighten domestic livestock supply, given the heightened retention of breeding stock across the cattle and sheep markets, strengthening the transition towards a herd and flock rebuild. 3. By continuing to browse this site or by accepting below, you consent to the use of cookies. events on Australian rainfall patterns. of the decay year for these particular events. © Meat & Livestock Australia Limited, 2020 The onset years for the 12 strongest 'classic' or 'canonical' La Niña events are 1910, 1916, 1917, 1938, The map shows that the average La Niña impact for winter/spring rainfall is not the exact opposite of the corresponding El Niño impact. All surveyed international climate models indicate La Niña thresholds will be met from September until at least the end of the year, with most models maintaining these values into early 2021, according to a Bureau of Meteorology update released today. Three-month composites of Australian This means wetter-than-average conditions are more likely to develop over large parts of Australia, as La Niña systems are typically associated with increased rainfall and cooler maximum temperatures. The reasons for the lack of a consistent response of winter/spring rainfall to El Niño and La Niña events for the coastal areas of New South Wales and southern Queensland are the subject of current research, but it should be noted that rainfall in these parts often arises from the lifting of on-shore air streams as they flow over the Great Dividing Range. For northern South Australia and northern Queensland, the La Niña response is quite a bit stronger than the El Niño response. Your comment will not appear until it has been moderated. The blue shadings in the map indicate 'above average' rainfall (deciles 8 and 9) for the six month period. The following maps show the evolution of 3-month rainfall deciles averaged over the 12 La Niña events. To see maps of total winter/spring rainfall in each of these La Niña years, select the year in the table. This is especially the case over Tasmania, SA, the NT and WA which have large areas of deciles 5 and 6 in the image above. Beef Central, September 16, 2020 All surveyed international climate models indicate La Niña thresholds will be met from September until at least the end of the year, with most models maintaining these values into early 2021, according to a Bureau of Meteorology update released today. Key indicators of ENSO are currently at or approaching La Niña thresholds, indicating that the atmosphere is responding to the changes in the ocean, the BOM says.
This page describes the average impact of the 12 strongest canonical © 2020 Meat & Livestock Australia Limited ABN 39 081 678 364. These percentiles were then averaged for each point in Australia, and the result mapped. For each of the twelve years, the rainfall percentiles for the winter/spring period were calculated against all years between 1900 and 2014.
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