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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
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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 />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />produced precipitation ranging from moderate (.48 inches) <br />to none (four episodes at Happy Jack had none but some light <br />precipitation was observed at other sites in two of the episodes). <br />SLW (equal to or greater than .01 mm per hour) for the ten <br />episodes averaged .092 mm which was nearly the same as with <br />the A-1 type storms. However, for the individual episodes <br />the SLW averages showed a wide range from .018 to .170 mm <br />per hour with four of them averaging over .10 rom per hour. <br /> <br />The only B-2 storm type episode had relatively good SLW <br />for five hours (.102 rom per hour) but produced no precipitation <br />at any of the network gauge sites. There were no episodes <br />which appeared to fit the Medina B-1 synoptic pattern and <br />the MC-3 episode was not classified with a Medina storm type. <br /> <br />When the hourly average of SLW was at least .01 mm it <br />averaged .095 mm for all 16 of the episodes with the median <br />value between .095-.096 mm. SLW averaged over all the hours <br />of all the episodes was slightly less, .077 mm per hour, with <br />the median between .070 and .075 mm. The highest episode <br />average was .197 mm per hour (for SS-l) and the least was <br />.002 rom per hour (for SS-10). <br /> <br />The relatively good SLW averages and the fact that several <br />of the A-2 type storms (and the B-2 storm) produced little <br />or no precipitation would suggest there is some potential <br />for augmentation by cloud seeding. In addition, the fact <br />that the average SLW for the A-1 type storms were greater <br />than the other types in three out of four of the cases would <br />suggest that the potential for augmentation with this type <br />might be greater than originally thought. <br /> <br />3-16 <br />
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