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Michael L. Kaplan and Douglas A. Paine

Abstract

A numerical model has been designed to link quasi-geostrophic and mesoscale forcing. Initializations performed at 127 km with either a barotropic forecast or a diagnostic omega equation are followed by a prediction with a moist nine-level primitive equation model operating on a 32-km grid mesh. The results of two short-period integrations indicate good correspondence between forecast omega fields and radar observations, observed snowfall, and diagnostic integrations. Vertical motions reach maxima of 25 and 50 cm sec−1, while the forecast dependent variables indicate an integral role played by long gravity waves in organizing mesoscale development.

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Michael L. Kaplan and Douglas A. Paine

Abstract

A numerical model has been developed in an effort to simulate the interaction between quasi-geostrophic and mesoscale forcing. Initializations performed at 127 km with either a diagnostic omega equation or barotropic forecast are followed by a prediction with a moist nine-level primitive equation model at 32 km. Several integrations are performed utilizing both real and artificial data for the problem of the water-induced heat island in the cold season. The results of these integrations indicate important variations in both the patterns and intensity of development as a function of initialization.

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