Mid-level mesoscale vortices impact warm-season precipitation over the United States (US), due to their ability to initiate and focus deep convection. Given their significance to forecasting, it is important to understand these mesoscale vortices, their frequency, and their impact on subsequent c... Show moreMid-level mesoscale vortices impact warm-season precipitation over the United States (US), due to their ability to initiate and focus deep convection. Given their significance to forecasting, it is important to understand these mesoscale vortices, their frequency, and their impact on subsequent convection in greater detail. This research was a pilot study aimed at identifying such vortices using two separate techniques. Vortices were identified through a subjective visual identification technique that relied mostly on composite radar reflectivity and satellite imagery, as well as through an objective algorithm applied to hourly, 20km Rapid Update Cycle model analyses. Vortices arising within organized convection, called mesoscale convective vortices (MCVs), as well as ones forming in the absence of convection (dry vortices) were identified over the central US during an active period from 1-10 June 2009. Additionally, MCVs that were responsible for triggering subsequent convection, termed secondary convection, were identified. The results from the subjective and objective methods were compared and vortex characteristics, such as their duration, were analyzed. The objective algorithm detected more vortices than expected, as well as an approximately equal distribution of dry and convective vortices. Approximately two-thirds of the MCVs detected by the algorithm were also detectable by the subjective, visual method. MCVs that triggered new convection accounted for less than half of all cases, while in general MCVs lasted longer than dry vortices. While extension of this research is necessary in order to apply to a more broad range of MCVs, these results demonstrate the potential of the methodology in identifying these vortices, which will potentially lead to a greater understanding of such systems. Show less
