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WMOD00284
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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 />Storm duration during the 11 storm periods averaged 32 <br />hours (median 31 hours) with the longest duration over the <br />network averaging 68 hours and the shortest averaging 10 hours. <br /> <br />For the precipitation gauge network, average precipitation <br />during the storms was 0.71 inches, but the storm total varied <br />considerably from storm to storm. The median, which was much <br />less than the average at 0.36 inches, was probably more repre- <br />sentative of a typical storm since the average contained an <br />unusual storm of the once in 20 year magnitude. Over 35 percent <br />of the storms had totals less than 0.10 inches. <br /> <br />Hourly precipitation rates during the storms were usually <br />light with over half of the hours with 0.01 inch or more receiving <br />less than 0.03 inch. However, on occasion (about 20 percent <br />of the time), hourly rates increased to 0.09 inch or more, <br />and half of the total seasonal precipitation was produced <br />with such rates. <br /> <br />Daily storm totals also tended to be light, with half <br />of the days on which precipitation fell recording amounts <br />below 0.15 inch. Such days contributed less than 10 percent <br />of the total recorded during all storms within the field season. <br />Half of the total seasonal precipitation fell on only 10 percent <br />of the days. These days recorded 0.70 inch or more. <br /> <br />The storm entity is usually composed of a number of continuous <br />precipitation periods within it. These periods, called precipi- <br />tation episodes, are often of short duration. Twenty-five <br />percent lasted only 1 hour and 50 percent had durations of <br />3 hours or less. However, storms of average length (approximately <br />a day) might reasonably be expected to have several precipitation <br /> <br />3-55 <br /> <br /> <br />I <br />I <br />, ' <br />, <br />, <br />I <br />'i <br />t <br />I <br />I <br />, <br />t <br />I <br />.~ <br />.~ <br />I <br />f <br />t <br />, <br />I <br /> <br />
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