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Last modified
7/28/2009 2:32:39 PM
Creation date
1/8/2008 12:16:50 PM
Metadata
Fields
Template:
Weather Modification
Applicant
Thompson, J.R., G.W. Wilderson, and D.A. Griffith, North American Weather Consultants
Sponsor Name
USBR
Title
Cloud Seeding Data Collection, and Analysis Assoc. with the Colo River Augmentation Demonstration Program
Prepared For
USBR, Divison of Atmospheric Research
Prepared By
Thompson, Wilderson, Griffith
Date
12/1/1987
State
AZ
Weather Modification - Doc Type
Scientific Study
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<br />I <br />I <br />:1 <br />I, <br />, <br />t <br />I <br />, <br />I <br />t <br />i <br />t <br />I. <br />I <br />, <br />I <br />t <br />I <br />t <br /> <br />there was a lull in the storm, perhaps at the beginning or <br />near the end when the storm was less organized. While the <br />Minor episodes occurred most frequently during the storms, <br />they usually occurred in combination with either the Moderate <br />and/or the Major episodes. Only 20 percent of the storm periods <br />during the field season contained precipitation periods that <br />were made up of only Minor episodes. Thus, if a given storm <br />were being seeded, most of these Minor episodes would likely <br />be seeded along with the larger precipitation periods. With <br />effective seeding, some of these Minor episodes could conceivably <br />become Moderate episodes. <br /> <br />3.2.10 <br /> <br />Episode Distribution During storms <br /> <br />Table 3-8 lists the number of episodes during the 11 <br />storm periods at each of the seven gauge sites. The number <br />per storm ranged from a maximum of seven (at 3 gauge sites <br />during 3 different storms) to a minimum of zero (at 2 gauge <br />sites during different storms). The average number of episodes <br />per storm over the network was nearly three (2.9) and the <br />median was three, while the mode (the most frequent number) <br />was two. This number of episodes per storm occurred 19 times <br />during the field season followed by three and one episodes <br />per storm (each occurred 15 times) suggesting the probability <br />of encountering more than one episode per storm is quite good. <br />In other words, it is infrequent that precipitation falls <br />without interruption throughout an entire storm period. <br /> <br />Throughout the field season, the average number of episodes <br />per gauge site was very evenly distributed, with a range of <br />only 2.7 to 3.2, but the average distribution during the individual <br />storms varied from near one (1.4) during storm number 2 (January <br /> <br />3-50 <br />
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