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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, the DAFWA indices suggest that a more optimistic approach to decision-making is recommended in 2006 and confidence in this assessment would be enhanced if a La Ni a develops... The needs analysis has enabled an assessment of the distribution of farmers along the pathway from initial awareness through to final adoption of CRM information and tools being offered by various organisations...
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Catalogue: Broadacre Field Crops DAFF QLD
A large contributor to climate variability in Australia is ENSO. ENSO or the El Ni o/Southern Oscillation is the term used to collectively describe the status of ocean and atmosphere circulation systems in the Pacific... Positive phases of the SOI (average monthly values of the SOI above +7.0 and often associated with a La Ni a SST pattern) reflect barometric air pressures over northern Australia being lower relative to those in the central Pacific... As autumn/early winter is the key time of the year when climate patterns such as La Ni a and El Ni o can change or develop quickly, we continue to recommend keeping an eye on the SOI and sea surface temperature (SST) trends...
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Catalogue: Ground Cover
For a La Ni a to develop, the relatively high-frequency fluctuations of SOI, winds and ocean temperatures would need to stop and be replaced by a period of consistently stronger-than-average trade winds, positive SOI values and further cooling of the ocean... Although July 2007 was wetter than July 2006 in western WA, Victoria and south-east SA, and there was a slight easing of 12-month deficits in those regions, south-east Queensland, Tasmania and the Eyre Peninsula experienced a drier July this year... A large part of south-east Queensland was also affected, as were Tasmania (except for the south-west) and parts of western WA between Carnarvon and Perth, as well as areas between Wagin and Albany...
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Catalogue: GRDC Factsheets
Climate and weather forecasting continue to improve as the Bureau of Meteorology (BoM) develops and refines new technology and modelling... The Southern Oscillation Index (SOI) is a measure calculated from sea level pressure differences between Tahiti and Darwin, and indicates El Ni o or La Ni a intensity... Planned upgrades will soon offer improvement in several areas...
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Catalogue: GRDC Factsheets
Climate and weather forecasting continue to improve as the Bureau of Meteorology (BoM) develops and refines new technology and modelling... The Southern Oscillation Index (SOI) is a measure calculated from sea level pressure differences between Tahiti and Darwin, and indicates El Ni o or La Ni a intensity... Planned upgrades will soon offer improvement in several areas...
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Catalogue: GRDC Factsheets
Climate and weather forecasting continue to improve as the Bureau of Meteorology (BoM) develops and refines new technology and modelling... The Southern Oscillation Index (SOI) is a measure calculated from sea level pressure differences between Tahiti and Darwin, and indicates El Ni o or La Ni a intensity... Planned upgrades will soon offer improvement in several areas...
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Catalogue: GRDC Factsheets
Climate and weather forecasting continue to improve as the Bureau of Meteorology (BoM) develops and refines new technology and modelling... The Southern Oscillation Index (SOI) is a measure calculated from sea level pressure differences between Tahiti and Darwin, and indicates El Ni o or La Ni a intensity... Planned upgrades will soon offer improvement in several areas...
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Catalogue: GRDC Updates (West)
Forecasts made at this time of year have varying degrees of skill and we advise users to consult the seasonal forecasts as they are updated monthly and the skill improves closer to the season... Verification of the 2011 SSF forecasts In terms of the 2011 seasonal forecasts the SSF gave a drier outlook to that which generally eventuated early in the season, but successfully forecast a wetter outlook for spring which assisted farmers with fertiliser decisions mid-year... AIMS The aim of this paper is to review the main climate indicators in 2011, and what is shaping in 2012...
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Catalogue: Ground Cover
The Walker circulation is a loop of winds over the Pacific Ocean that influences much of the region's climate... A weakening system indicates an El Ni o event, increasing the risk of drought in Australia... Warm and wet for the west A warmer than average end to the year is predicted across Australia, although rainfall trends vary from east to west, with higher seasonal falls expected in western WA and a drier than average season more probable in the far south-east of the country (see maps)...
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Catalogue: Ground Cover
The chance of a La Ni a developing in 2007 is thought to be higher than the long-term average, which is about one in five, or 20 per cent... La Ni a events tend to follow El Ni os; the 2006-07 El Ni o weakened somewhat earlier than normal giving time for a La Ni a to begin developing during the critical March to June period; and a large pool of cold sub-surface water remains in the central to eastern tropical Pacific Ocean and is starting to affect surface temperatures in the region... BOM climate meteorologist Grant Beard says that although central to eastern Pacific sea-surface temperatures have remained close to average during March, following the rapid cooling that took place during January and February, the remaining large pool of cold sub-surface water could indicate a La Ni a event...
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