The use of indices in following the trend in surface synoptic patterns - in particular, as indicating the possibility of the persistence of a large quasi-stationary trough south of Australia

Key Points

• This research aims to examine how indices of surface circulation can indicate the persistence of a quasi-stationary trough south of Australia.
• The study plotted indices of westerly surface circulation as running five-day means.
• Indices were analyzed at the 300 mb level over specific Australian areas.
• Mean jet stream strength was utilized as an index for analysis.
• Peak values of surface and jet stream indices coincided with the occurrence of large quasi-stationary troughs.
• Findings suggest a correlation between indices and weather patterns impacting Australia.