|Vic Seasonal Rainfall Outlook: probabilities for April to June 2004, issued 17th March 2004|
Below average June quarter rainfall more likely in Victoria
The Bureau's seasonal rainfall outlook for the June quarter shows that a drier than average season is more likely across much of Victoria, the only exception being East Gippsland. This outlook pattern is a result of the combined effects of above average temperatures in both the Pacific and Indian Oceans.
For the April to June period, the chances of above median rainfall are between 30 and 40% across western, central and northeast Victoria (see map). This means that BELOW median falls have a 60 to 70% chance of occurring across these parts of the State. So with climate patterns like the current, about 7 seasons out of 10 are expected to be drier than average in these areas, with about 3 out of 10 being wetter.
In East Gippsland the chances of a wetter than average June quarter are mainly between 40 and 55%.
Outlook confidence is related to the influence of Pacific and Indian Ocean temperatures on seasonal rainfall. During the June quarter, history shows this influence to be moderately consistent across most of Victoria (see background information).
Both the Indian and tropical Pacific Oceans remain warmer than average. For more detail see the the El Niño Wrap-Up.
The Southern Oscillation Index (SOI) has shown strong month-to-month variations recently, in association with active and inactive phases of the northern Australian monsoon. February's value was +9 following the 12 in January and +10 in December. The approximate SOI for the 30 days ending 14th March was +4.
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 (EDT) Monday to Friday by contacting the Climate and Consultancy section in the Bureau's Victorian Regional Office: (03) 9669 4949.|
THE NEXT ISSUE OF THE SEASONAL OUTLOOK IS EXPECTED BY 19th APRIL 2004.