Abstract: Results obtained by Hansen and Sutera concerning the occurrence of bimodal probability density functions (PDFs) in a wave amplitude index (WAI) calculated from large-scale atmospheric flow data are re-examined. The PDFs ...

Abstract: The robustness of low-frequency circulation patterns defined by unrotated and rotated empirical orthogonal functions (E0Fs) are compared based on the Northern Hemisphere 10-day low-pass filtered wintertime 500-hPa height ...