An Examination of Jet Stream Configurations, 500 mb Vorticity Advection and Low-Level Thermal Advection Patterns During Extended Periods of Intense Convection

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Abstract
Three cases of widespread and persistent intense convective storms are examined. It is shown that synoptic-scale meteorological settings attending these events did not fit classic severe storm patterns that have been extensively documented in the literature. The analyses suggest that lower-tropospheric warm advection dominated mid-tropospheric differential vorticity advection in forcing upward vertical motion that triggered and organized the convective events. It is hypothesized that by shifting attention from the 500 mb level to observed and forecast low-level warm advection, the operational forecaster might better anticipate organized, intense convective outbreaks that develop within relatively benign synoptic-scale settings.

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