A comparison of two seasonal rainfall forecasting systems for Australia

Fawcett, R. J. B. and Stone, R. C. (2010) A comparison of two seasonal rainfall forecasting systems for Australia. Australian Meteorological and Oceanographic Journal, 60 (1). pp. 15-24. ISSN 1836-716X


Operational El Nino-Southern Oscillation (ENSO)-based statistical forecasting of seasonal rainfall has been undertaken in Australia now for the best part of two decades. This article compares the performance in recent years (1997 to 2009) of the two major governmental programs currently forecasting seasonal rainfall across Australia, through the verification of independent forecasts. These programs are run by the Australian Bureau of Meteorology and the Queensland Government's Department of Environment and Resource Management (and its predecessors). In this study, the Queensland Government's Southern Oscillation Index (SOI) phase-based forecasts are not verified directly. Instead, the SOI-phase system methodology is reconstructed using the Bureau's monthly rainfall analyses and those reconstructed forecasts verified. Verification techniques employed include linear error in probability space (LEPS2) skill scores, per cent consistent rates, and reliability statistics.
Over recent years, the Bureau forecasts and the SOI-phase forecasts have performed comparably when measured by the per cent consistent statistic, although with successes and failures in different parts of the country. Both sets of forecasts show widespread forecast skill in excess of climatology, the Bureau forecasts performing better in the west of the country and the SOI-phase forecasts performing better in the centre and east. The generally more emphatic SOI-phase forecasts translated into higher LEPS2 skill scores, but the Bureau forecasts showed greater reliability.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held.
Faculty / Department / School: Current - USQ Other
Date Deposited: 15 Sep 2010 12:23
Last Modified: 02 Jul 2013 23:57
Uncontrolled Keywords: seasonal rainfall; forecasting; prediction; Southern Oscillation Index
Fields of Research : 01 Mathematical Sciences > 0104 Statistics > 010401 Applied Statistics
05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960304 Climate Variability (excl. Social Impacts)
D Environment > 96 Environment > 9603 Climate and Climate Change > 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts)
URI: http://eprints.usq.edu.au/id/eprint/8336

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