HRRRE and other CAM guidance skill can vary widely in different weather regimes. Convective forcing is hypothesized to influence forecast skill and CAM ensemble variance. Understanding the correlation between forcing and ensemble skill/variance has the potential to enhance the future HRRRE ensemble design. To study this relationship, an objective measure of convective forcing is required.
This study developed the Reflectivity Convective Forcing Categorization (RCFC), a quantitative method to categorize convective forcing using Multi-Radar Multi-Sensor (MRMS) composite reflectivity observations. Both reflectivity coverage and rate of change of reflectivity were examined for the months of May and June 2016 utilizing RCFC. Measuring forcing based on MRMS radar observations allowed the classification to be independent from model analyses and forecasts. Several events exemplifying strong and weak forcing regimes were qualitatively analyzed using Storm Prediction Center (SPC) mesoscale analyses, upper air maps, and surface analyses, to verify the RCFC method. With verification, the RCFC method will be utilized as the primary HRRRE measure for convective forcing.