|NT Seasonal Rainfall Outlook: probabilities for July to September 2006, issued 27th June 2006|
50:50 chances for above average September quarter rainfall
The current three-month rainfall odds do not strongly favour either wetter or drier than average conditions. Therefore, the chances of accumulating at least median rain during the September quarter (July-September) are close to 50% across Northern Territory, the Bureau of Meteorology announced today.
The pattern of three-month rainfall odds across Australia is largely a result of above average temperatures in the Pacific Ocean. Conditions in the Indian Ocean are near normal and have had little influence on this outlook.
For the July to September period, the chances of above median rainfall are between 40 and 45% over most of the NT (see map). However, it must be remembered that these three months are in the height of the dry season over the northern half of the NT and heavy rain is uncommon during this period. So in years with ocean patterns like the current, about four or five September quarters out of 10 are expected to be wetter than average over the Territory, with about five or six out of ten being drier.
Outlook confidence is related to how consistently the Pacific and Indian Oceans affect Australian rainfall. During July to September, history shows this effect to be moderately consistent across most of the NT (see background information).
After moderately positive values of +14 and +15 in March and April respectively, the Southern Oscillation Index (SOI) dropped substantially in May to a value of −10. The approximate SOI for the 30 days ending 24th June is −9.
It is likely that neutral ENSO conditions will remain in place for the remainder of 2006. For routine updates and comprehensive discussion on the latest data relating to ENSO, together with details on what the phenomenon is and how it has affected Australia in the past, please see the ENSO Wrap-Up.
Click on the map above for a larger version of the map. Use the reload/refresh button to ensure the latest forecast map is displayed.
|More information on this outlook is available from 9.00am to 5.00pm (CST) Monday to Friday by contacting the Climate and Consultancy section in the Bureau's Darwin Office: (08) 8920 3813.|
THE NEXT ISSUE OF THE SEASONAL OUTLOOK IS EXPECTED BY 25th JULY 2006