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Last modified
7/28/2009 2:32:11 PM
Creation date
10/25/2007 9:59:21 AM
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Weather Modification
Title
An Evaluation of First Echo Detection of the North Dakota Cloud Modification Project
Prepared For
North Dakota Atmospheric Research Board
Prepared By
Paul A. Kucera, Eric Wise
Date
10/1/2005
State
ND
Weather Modification - Doc Type
Report
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RESULTS <br /> This section shows the results of the comparison between Stanley and the KMBX <br />radar. Table 2 shows the date and a summary of time difference between the radar for <br />first echo detection. It can be seen that there were time differences that were negative. <br />This indicates that the Stanley radar detected the new cell development first. However, <br />the time differences were less than three minutes. Therefore, they were considered to <br />have occurred at the same time as the KMBX radar. This was due to the fact that the two <br />radars have independent scan schedules with average of six minutes between scans. In <br />our study, we assumed that any time less the four minutes occurred at during the same <br />scan. <br /> The average, minimum, and maximum time difference between the two radars were <br />calculated. The average time difference between the two radars was eight minutes, This <br />means that, on average, the KMBX radar detects first echo detection a scan sooner than <br />the Stanley radar. Again, a difference of eight minutes was near the six minute scan <br />sequence. Therefore, it was considered to be a difference of one scan. The maximum <br />time difference calculated in this study was 42 minutes. This large time difference was <br />mainly due to attenuation of the Stanley radar. In this case, there was a line of storms <br />tracking over the Stanley radar, when a new cell developed to the southeast of the radar. <br />The attenuation due to the storms moving over the radar caused the new cell development <br />not to be detected by the Stanley radar until the storms were clear of the radar and the <br />impact of attenuated was reduced. <br /> The time difference between the radars is shown in Figure 2, a box plot of the <br />difference in minutes. The box plot indicates that the mean time difference of first echo <br />14 <br />
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