In late July 1998, the central U.S. was host to a daily succession of such MCSs which propagated around the periphery of a subtropical ridge centered over Texas. For several days, precipitation was largely relegated to a narrow corridor in the vicinity of a strong instability gradient, with very little variation in its diurnal timing. In this paper we describe the environment near the convective systems by compositing numerical model analyses from the Rapid Update Cycle-2 (RUC-2). Fields are composited for different phases of the diurnal cycle. Additional composites are constructed with a coordinate system centered on the individual MCS and aligned with its direction of propagation. The interplay between the large-scale environment and the convection will be discussed from dynamical perspective.
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