Daily gridded precipitation data over North America for the 11 years of 1984-94 are used in this study. Singular spectrum analysis and multi-channel singular spectrum analysis are used to identify the spatial and temporal oscillatory behavior of the intraseasonal scale precipitation variations.
The results showed that both 24-day and 37-day oscillation exist in the North American precipitation filed. The amplitudes of the both oscillations are larger in the northwest region, where the 37-day oscillation seems stronger. However, the 24-day oscillation in the eastern United States seems more significant than that of the 37-days