|NSW Seasonal Rainfall Outlook: probabilities for August to October 2006, issued 25th July 2006|
50:50 chances for above average seasonal rainfall
The current seasonal rainfall odds do not strongly favour either wetter or drier than average conditions across New South Wales. The chances of accumulating at least median rain during the late winter to mid-spring period (August-October) are close to 50% across the State, the Bureau of Meteorology announced today.
For the August to October period, the chances of above median rainfall range from a little below 45% in far western NSW, to somewhat above 55% in the northeast (see map). So in years with ocean patterns like the current, about five August to October periods out of 10 are expected to be drier than average over NSW, with about five out of ten being wetter.
Outlook confidence is related to how consistently the Pacific and Indian Oceans affect Australian rainfall. During August to October, history shows this effect to be moderately consistent across the the northern inland of NSW and in patches over the centre of the State. Elsewhere, it is generally weakly consistent (see background information).
After falling to −10 in May, the Southern Oscillation Index (SOI) rose slightly in June to a value of −6. The approximate SOI for the 30 days ending 22nd July was −9.
Although the chances of an El Niño have risen somewhat in the past month, continued neutral ENSO conditions is the most likely outcome 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 (EST) Monday to Friday by contacting the NSW Climate Services section in the Bureau's Sydney Office: (02) 9296 1610 or (02) 9296 1525.|
THE NEXT ISSUE OF THE SEASONAL OUTLOOK IS EXPECTED BY 24th AUGUST 2006