Abstract
Abstract Seven precipitation bands observed during the Canadian Atlantic Storms Program (CASP) are studied to assess the importance of slantwise convective instability. Using three-hourly radiosonde data from regular and special stations, vertical cross sections of θe*(saturated equivalent potential temperature) and M,(absolute angular momentum) and θe(equivalent potential temperature) and M surfaces are constructed. A comparison of the slopes of constant M,θe and θe* surfaces indicates the presence of potential and conditional slantwise instability. This study focuses on the time evolution of the stability field and on the adjustment to its neutral state. Consistent results were found in seven cases analyzed. The atmosphere is shown to contain shallow layers of air that are slightly unstable for conditional slantwise convection, particularly in regions having pronounced windshear. In the upper levels, the potential for instability usually remains only a potential because the lack of moisture precludes th...
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