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WSR-88D Reflectivity Vertical Cross-Section of a Supercell Thunderstorm Vertical cross-sections of reflectivity data can be constructed based on forecaster input. Forecasters "cut" a cross-sectional line through a precipitation entity or thunderstorm of interest. A software program within the Radar Products Generator (RPG) creates the chosen cross-section based on various radar elevation scans through the entity, which is then displayed for forecaster assessment. Cross-sections are extremely important in assessing the vertical structure of thunderstorms. In the accompanying diagram of a supercell storm, a deep layer of very heavy precipitation (red colors) exists in the storm (up to above 40,000 ft). In addition, the pink region inside the red area from 5000 to 35,000 ft indicates a deep layer of large hail within the storm, suspended aloft by an intense, rotating updraft. The echo top of the storm is over 50,000 ft, while lighter precipitation is suspended aloft to the right of the most intense portion of the storm.   

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