VORTEX CLOUD STUDIES.
GEOPHYSICS CORP OF AMERICA BEDFORD MASS
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Simple dynamical models are constructed to explain the formation of spiral cloud bands in hurricanes and cyclones. In Model I instability due to a vertical wind shear perpendicular to the mean flow is stressed. This model leads to small or medium scale disturbances the preferred scale for the spiral cloud bands in hurricanes is computed to be about 25-30 km for the assumed atmospheric parameters. Model II includes the effect of rotation and friction on the instabili ty due to a thermal stratification and a wind shear parallel to the mean wind direction. It is found that the inclusion of the Coriolis effet can make possible the realization of shear in stability even when the static stability is posi tive. The maximum wavelength can be increased as the ratio of the horizontal to vertical eddy viscosity is increased. In Model III the effect of baroclinicity is also considered. Author