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detection between the Stanley and KMBX radars was six minutes. The outliers in the <br />box plot in Figure 2 were affected by attenuation of other cells. In these cases, there were <br />storms over the radar, or between the radar and the new echo. An interesting note is that <br />the Stanley radar never detected first echo development earlier than the KMBX radar for <br />all ranges between the two radars. <br /> An issue that needs to be mentioned is ground clutter observed by the KMBX radar. <br />Significant ground clutter could lead to problems in first echo detection. If a new echo <br />developed in the ground clatter region, it may be difficult to determine if a new echo until <br />it intensifies above the nominal clutter. In this study, the full radar loop was available. <br />Therefore, a developing cell could be looped back in time to determine the exact time the <br />radar detected the new cell. Without being able to loop back and time in real time use, it <br />is likely that new echo development would not be detected in the initial scan. Therefore, <br />the first echo benefit would be reduced. We did not investigate the effects of clutter in <br />this study. . <br />15 <br />