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Figure 1: Radar reflectivity (in dBZ) and numbered gust fronts for a squall line case over the US. (a) The observed WSI IHOP Sector Mosaic reflectivity (2-km) at 00UTC 13 June 2002 (URL: http://data.eol.ucar.edu/codiac/dss/id=77.091). Note that these images are a vertical composite of reflectivity and depict the highest reflectivity measured over each point on the Earth’s surface. (b) and (c) are from the WSM6 and WDM6 experiments, respectively. The reflectivities were calculated from model-simulated precipitation particles (rain, snow, and graupel). The plotted results are from the second domain (i.e., 3-km resolution). Three figures in the second row are the same as (a), (b), and (c), except they were observed at 03UTC 13 June 2002. Figures in the third row represent same fields at 06UTC 13 June 2002. Here, the vectors denote the 850-hPa wind (ms-1).