Spatiotemporal Characteristics and Large-Scale Environments of Mesoscale Convective Systems East of the Rocky Mountains

Summary

This observational analysis of 13 years of high-resolution radar and satellite data characterises mesoscale convective systems east of the Rocky Mountains, revealing pronounced seasonal and spatial variability in MCS structure and precipitation regimes. The study demonstrates that distinct large-scale environmental conditions across seasons—including baroclinic forcing strength, thermodynamic properties, and pressure patterns—significantly shape MCS morphology, convective depth, and precipitation distribution. The findings provide empirical constraints on MCS behaviour across North American regions and seasons, with direct implications for improving climate model representation of convective precipitation.

UK applicability

This study focuses on MCS behaviour in the United States and may have limited direct applicability to UK conditions, where mesoscale convection operates under different large-scale forcing regimes and within smaller spatial domains. However, the methodological approach and conceptual framework linking environmental conditions to convective structure could inform UK-based research on convective precipitation and climate modelling of extreme rainfall events.

Key measures

MCS frequency, intensity, duration, spatial extent, convective depth, stratiform rain area, rainfall volume, seasonal and diurnal cycles, large-scale environmental forcing metrics (baroclinic, thermodynamic, pressure patterns)

Outcomes reported

The study characterised the spatiotemporal variability and three-dimensional structures of mesoscale convective systems (MCSs) east of the Rocky Mountains across all seasons using 13 years of radar and satellite observations. It documented how large-scale environmental conditions drive distinct MCS structures, precipitation generation, and diurnal cycles across spring, summer, autumn, and winter seasons.

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