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.
