Abstract: We discuss some statistical properties of the observed tropospheric circulation in Northern Hemisphere mid-latitudes. The data used consist of the twice-daily 500 mb height NMC analyses for the period 1966?77. Our analysis ...

Abstract: A variational principle is presented for periodic, finite-amplitude gravity waves in terms of a stream-function.

Abstract: A recent analysis of atmospheric observations has shown evidence of bimodality in the statistical distribution of wave amplitude in the ultralong (zonal wavenumber group 2?4), low frequency (period >5 days). Similar analysis ...

Abstract: The response of a simple quasi-unidimensional barotropic model is studied. Wave-wave interaction, and bending the linear resonant response to the topographic forcing allows multiple equilibria if the zonal mean flow is ...

Abstract: Methods to quantify predictability properties of atmospheric flows are proposed. The ?extended self-similarity? technique, recently employed in turbulence data analysis, is used to characterize predictability properties ...