Agriculture Weather
Southern Oscillation Index
The Southern Oscillation Index (SOI) is calculated from the monthly or seasonal fluctuations in the air pressure difference between Tahiti and Darwin.
A strongly and consistently positive SOI pattern (e.g. consistently above about +6 over a two month period) is related to a high probability of above the long-term average (median) rainfall for many areas of Australia, especially areas of eastern Australia (including northern Tasmania) - La Niña.
Conversely, a 'deep' and consistently negative SOI pattern (less than about minus 6 over a two month period, with little change over that period) is related to a high probability of below median rainfall for many areas of Australia at certain times of the year - El Niño.
However, it is important to remember that the pattern of relationship between SOI and rainfall (and temperature) can vary depending on the particular season and region. Additionally, the change in SOI over a specified period can be as important in understanding relationships between SOI and rainfall as is the absolute value in SOI.
Southern Oscillation Index
Nino3.4 Index
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Weather News
Massive temperature discrepancies across Australia's southern coastline
11:46 EDT
Temperature discrepancies of more than 20 degrees are being experienced along the vast extent of Australia’s southern coastline on Tuesday morning, due to two distinct weather systems.
SES fears storm preparations overlooked during COVID-19 lockdown
00:46 EDT
The SES is reminding people to not let the pandemic distract them from preparing their homes for the storm season.
