The featured map presents unfiltered totals by NWS forecast office of one plus inch hail reports from NWS Local Storm Reports (LSRs) for this year. It is interesting to denote the highest total is found with Rapid City, SD just edging out Norman, OK. The generation of severe hail requires robust convection driven by strong instability. Such instability is favored during the summer season over the region east of the Rocky Mountains as warm and moist air from the Gulf of Mexico near the surface interacts with colder air aloft and lifting mechanisms associated with mountain interactions.

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Tags:   hail