Abstract
Abstract In this study, the synoptic evolution of the March 1993 superstorm is documented using conventional observations, and the predictability and deepening mechanisms of the storm are investigated using a newly implemented mesoscale version of the Canadian Regional Finite-Element (RFE) Mode. It is found that although the RFE model can predict well the large-scale background flow associated with the storm, it fails to predict various important mesoscale elements when it is initialized with fields that contain weak signals of the low-level circulations. However, when the storm is located close to the data-rich region, the model has considerable skill in predicting those mesoscale elements, such as a prefrontal squall line, upper- and low-level jets, as well as the quantitative aspects of their associated precipitation. Observational analysis reveals that the storm developed in a convectively unstable prestorm environment with ample moisture content. It first experienced an antecedent surface vorticity g...
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