Abstract: Anomalous wave source regions are identified during the life cycles of persistent flow anomalies occurring over the North Pacific and North Atlantic Oceans during boreal winter. These cases project strongly upon the ...

Abstract: Diagnostic results are presented indicating that during the Arctic oscillation surface climate variations are directly forced by changes in the strength of the stratospheric polar vortex. To be specific, large-scale potential ...

Abstract: iquid water content (g m?3), precipitation rate (mm h?1), and radar reflectivity (dBZ) are inferred from cross sections of particle images obtained by aircraft. Each dataset is presented in a probability format to display ...

Abstract: A survey of reports of electrical activity in hurricanes and typhoons from flight notes and personal experience (18 years, >230 eyewall penetrations for R. A. Black; ?20 years for J. Hallett, plus that of others at the ...

Abstract: he high-latitude atmosphere experiences a rapid state transition during Arctic spring onset (ASO) with distinct warming in surface 2-m air temperature (T2m) occurring over broad geographical regions. Three methods are ...

Abstract: Earlier studies of persistent large-scale flow anomalies have been extended, with the aim of identifying the primary mechanisms for persistent anomaly development. In this study the focus is on wintertime cases of persistent ...

Abstract: A principal component analysis is performed to characterize intraseasonal variability in the boreal stratospheric polar vortex. In contrast to previous studies, the current analysis examines daily zonal-mean variability ...

Abstract: A composite observational analysis is presented demonstrating that austral stratospheric final warming (SFW) events provide a substantial organizing influence upon the large-scale atmospheric circulation in the Southern ...

Abstract: A lag composite analysis is performed of the zonal-mean structure and dynamics of Northern Hemisphere stratospheric final warming (SFW) events. SFW events are linked to distinct zonal wind deceleration signatures in the ...

Abstract: The present study extends our previous work on the life cycles of persistent anomalies by providing more comprehensive analyses of the synoptic and dynamical characteristics associated with the developments of the anomalies. ...