SXXS20 ADRM 040434 IDD20710 Australian Government Bureau of Meteorology Northern Territory Darwin Regional Forecasting Centre Southern Oscillation Index Bulletin issued 2:05 pm CST Wednesday 4 November 2015 Attention: Director Met Services Darwin mean MSL pressure for October 2015 1013.8 hPa Darwin MSL pressure anomaly: +3.1hPa Tahiti mean MSL pressure for October 2015 1013.4 hPa Tahiti MSL pressure anomaly: -0.2 hPa SOI: -20.2 5 Month running mean SOI: -16.9 Darwin mean 0900 MSL pressure for October 2015 1016.1 hPa