Abstract: A 10-yr climatology (1986?95) was performed using ECMWF gridded analyses on isentropic surfaces to identify regions where the lower-tropospheric meridional potential vorticity (PV) gradient changes sign across Africa and ...

Abstract: A large-amplitude mixed Rossby?gravity wave packet is identified in the western Pacific using 6?10-day bandpass-filtered winds. Individual disturbances of 2300?3000-km wavelength propagated westward as the packet moved ...

Abstract: A two-dimensional, hydrostatic, nearly adiabatic primitive equation model is used to study the evolution of a front passing across topography. Frontogenesis is forced by shearing deformation associated with the nonlinear ...

Abstract: The tropical intraseasonal oscillation (ISO) causes variations in the large-scale flow over the western North Pacific during June?August that strongly impact the energetics of tropical depression (TD)-type disturbances. ...

Abstract: Hurricanes cause drastic social problems as well as generate huge economic losses. A reliable forecast of the level of hurricane activity covering the next several seasons has the potential to mitigate against such losses ...

Abstract: A significant sign reversal in the meridional potential vorticity gradient was found during the summer of 1991 on the 310-K isentropic surface (near 700 mb) over the Caribbean Sea. The Charney?Stern necessary condition for ...

Abstract: The genesis of Hurricane Hernan (1996) in the eastern Pacific was investigated using gridded analyses from the European Centre for Medium-Range Weather Forecasts and gridded outgoing longwave radiation. Hernan developed ...

Abstract: Forty-six years of summer rainfall and tropical cyclone data are used to explore the role that eastern North Pacific tropical cyclones (TCs) play in the rainfall climatology of the summer monsoon over the southwestern ...

Abstract: On 31 May 1998, an F3 tornado struck Mechanicville, New York, injuring 68 people and causing $71 million in damage. The tornado was part of a widespread, severe weather outbreak across the northeast United States. The ...

Abstract: The process of tornadogenesis in complex terrain environments has received relatively little research attention to date. Here, an analysis is presented of a long-lived supercell that became tornadic over complex terrain ...