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Features a low-order model of the extratropical atmosphere built from long records of potential vorticity. Low-order potential vorticity model; Quasi-stationary weather regimes; Intraseasonal oscillations; Time-dependent solutions of the low-order model; Diagnostic results of the weather regime study.

Develops the theory of empirical normal modes for a shallow water fluid in the field of numerical weather predictions in the United States. Wave activities and normal modes for shallow water fluid; Numerical experiments; Statistical prediction using empirical normal modes.

Compares two different definitions of midlatitude weather regimes. Emergence of weather regimes in dynamical meteorology as a particular representation of atmospheric dynamics; Recurrent atmospheric patterns; Quasi-stationary patterns; Use of cluster analysis; Performance of analysis over Atlantic and Pacific sectors; Description of methodology used to identify quasi-stationary regimes.

Presents a study of low-frequency oscillations and weather regimes in the midlatitudes of the Northern Hemisphere. The multichannel singular spectrum analysis; The low-frequency oscillations and weather regimes; Results and conclusions.