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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 />did indicate the presence of some SLW they were used in determining <br />the beginning and ending of an episode. <br /> <br />Classification of SLW was adopted to describe the relative <br />intensity of the hourly values, wherein SLW values between <br />.01-.10 rom were classified as light, SLW values between .11-.29 <br />mm were classified as moderate and hourly SLW averages of <br />.30 rom or more were classified as strong. <br /> <br />Precipitation rates to the nearest .002 inch (.05 mm) <br />per hour were recorded at the gauge near Happy Jack while <br />the other six gauge sites, which made up the gauge network, <br />recorded rates to the nearest .005 inch (.13 rom) per hour. <br /> <br />3.1.3 <br /> <br />storm Categorization <br /> <br />All the episodes were evaluated on the basis of two factors. <br />The first of these was whether the period of SLW and/or precipi- <br />.tation was produced by a synoptic-scale weather system, as <br />evident on standard National Weather Service (NWS) synoptic <br />maps and satellite imagery. If so, then the first letter <br />designation was "S" for Synoptic. If not, then the first <br />letter designation was "M" for Mesoscale. The second factor <br />was whether the pe~~od of SLW and/or precipitation contained <br />significant convection during the episode. If so, then the <br />second letter designation was "C" for Convection. If not, <br />the second letter designation was "S" for Stratiform. Significant <br />convection has been considered to mean that at least half <br />the episode exhibited evidence of convection (either from <br />the "spikey" nature of the radiometer trace and/or the appearance <br />of the cloudiness from satellite imagery and/or the character <br />of the rawinsonde plots). The reason for trying to separate <br /> <br />3-7 <br /> <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 />
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