Thailand Monsoon Domain weather is govern by the Asian Summer monsoon which displays high variability in seasonal and interannual time scales. Different precipitation providing weather systems demonstrate different response to different weather related phenomenon such as Pacific-Japan (PJ) oscillation. Precipitation is decomposed into several systems namely tropical cyclones, extra tropical cyclones and fronts, and westward propagating disturbances, the precipitation which not related with any other systems categorized as “others”. Several objective detection methodologies were utilized in detecting different precipitation providing weather systems. The decomposed precipitation amounts related to different weather systems were correlated with PJ pattern and the correlations found to be in a positive phase in around Thailand. Positive PJ pattern tend increase precipitation events but not tropical cyclones and precipitation in late summer tend to enhanced by positive PJ phase. Dynamical response of the PJ pattern need to be further studied in association with different precipitation providing weather systems.
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