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Journal Title:Electronic Journal of Sever Storms Meteorology
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Description:The operational deployment of the multi-radar, multi-sensor (MRMS) system has made available new
products to use for hail detection. MRMS products are provided on a spatial grid and can give information
on hail size and the spatial extent and distribution of the hail fall. This information is important to a wide
audience, including warning forecasters needing to focus on areas for warning verification and insurance
users needing to verify a claim. Products are typically verified and evaluated using hail reports from Storm
Data, which are reports collected by local National Weather Service Offices. The National Severe Storms
Laboratory conducted a project to collect reports of hail, including reports of “no hail” near storms, at high
spatial resolution. This project, the Severe Hazards Analysis and Verification Experiment (SHAVE),
collected tens of thousands of hail reports over ten years of operations. Three-hundred eighty-nine SHAVE
operations, which yielded 21 184 SHAVE reports and 2814 Storm Data reports, are investigated. Nine
MRMS products were evaluated with the reflectivity at lowest altitude demonstrating the best discrimination for where hail of any size fell and the maximum expected size of hail product provided the best discrimination for severe-sized hail. SHAVE- and Storm Data-based evaluations showed marked differences in product skill scores. Discussions on the differences between the hail report databases and explorations of vertical profiles of reflectivity are included.
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Source:J. Severe Storms Meteor., 13 (1), 1‒36
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