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Abstract: Recurrent departures of mean weekly temperatures from a smooth seasonal trend during the past several decades in the northeastern United States are shown to be a manifestation of a shift in the planetary circulation. The ...

Abstract: Examples of three types of 500-mb. cyclone development, distinguished by the location of the cyclogenesis relative to the zonal velocity profile a t 500 mb., are shown. Differences in the mean motion of all three cyclone ...

Abstract: Geographical frequency distributions of cyclones and cyclogenesis, and frequency distributions of the 24-hour displacement of cyclones, at the 500-millibar level over the northwest quadrasphere, based on six years of 500-mb ...